MTU 12V4000 G23 troubleshooting: 263 fault codes and 41 symptom-cause-remedy entries from the manufacturer's own service documentation.
MTU 12V4000 G23 — full specs, parts & maintenance.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 003 | HI T-Fuel — Preliminary warning: fuel temperature too high. | Contact Service. | |
| 004 | SS T-Fuel — Main warning: fuel temperature too high; engine stop. | Contact Service. | |
| 005 | HI T-Charge Air — Preliminary warning: charge-air temperature too high | 1. Reduce power. 2. Check intercooler. | |
| 006 | SS T-Charge Air — Main warning: charge-air temperature too high; engine stop. | 1. Reduce power. 2. Check intercooler. | |
| 009 | AL L1 T-Coolant Intercooler — Preliminary warning: coolant temperature in intercooler too low. | Reduce power. | |
| 010 | AL L2 T-Coolant Intercooler — Main warning: charge-air coolant temperature too high; engine stop. | Reduce power. | |
| 015 | LO P-Lube Oil — Preliminary warning: lube oil pressure too low. | Check oil level, top up as necessary (→ Page 146). | |
| 016 | SS P-Lube Oil — Main warning: lube oil pressure too low; engine will be shut down. | 1. Check oil level, top up as necessary (→ Page 146). 2. Attempt to restart engine (→ Page 57). | |
| 019 | HI T-Exhaust A — Preliminary warning: exhaust gas temperature (A-side) too high. | 1. Check cabling (→ Page 171). 2. Contact Service. | |
| 020 | SS T-Exhaust A — Main warning: exhaust gas temperature (A-side) too high. Engine stop. | 1. Check cabling (→ Page 171). 2. Contact Service. | |
| 021 | HI T-Exhaust B — Preliminary warning: exhaust gas temperature (B-side) too high. | 1. Check cabling (→ Page 171). 2. Contact Service. | |
| 022 | SS T-Exhaust B — Main warning: exhaust gas temperature (B-side) too high. Engine stop. | 1. Check cabling (→ Page 171). 2. Contact Service. | |
| 023 | LO Coolant Level — Alarm configuration limit value 1; coolant level too low. | Check coolant level in expansion tank (→ Page 153). | |
| 024 | SS Coolant Level — Alarm configuration limit value 2; coolant level too low. | Check coolant level in expansion tank (→ Page 153). | |
| 025 | HI P-Diff. Lube Oil — Alarm configuration limit value 1; preliminary warning: oil filter differential pressure too high. | Replace oil filter (→ Page 150). | |
| 026 | HI P-Diff. Lube Oil — Alarm configuration limit value 1; preliminary warning: oil filter differential pressure too high. | Replace oil filter (→ Page 150). | |
| 027 | HI Leak Fuel Level — Alarm configuration limit value 1; preliminary warning: leak-off fuel level too high. | 1. Check fuel system. 2. Contact Service. | |
| 029 | HI ETC 2 idle speed — Idle speed of ETC 2 too high. | Contact Service. | |
| 030 | SS Engine Speed — Alarm configuration limit value 2; engine overspeed; reduced fuel injection. | 1. Acknowledge alarm. 2. Attempt to restart engine. | |
| 031 | HI ETC 1 overspeed — Alarm configuration limit value 1; preliminary warning: speed of primary turbocharger too high. | Contact Service. | |
| 032 | SS ETC 1 overspeed — Alarm configuration limit value 2; speed of primary turbocharger too high. | 1. Automatic power reduction by engine control system. 2. Check air filters (→ Page 138). | |
| 036 | HI ETC 2 overspeed — Alarm configuration limit value 1; preliminary warning: speed of secondary turbocharger too high. | 1. Reduce power. 2. Contact Service. | |
| 037 | SS ETC 2 overspeed — Alarm configuration limit value 2; main warning: speed of secondary turbocharger too high. Fuel limitation to a fixed value. | 1. Reduce power. 2. Contact Service. | |
| 038 | AL ETC Synchro Fault — Synchronization error between ETCs 1 and 2. | 1. Reduce power. 2. Contact Service. | |
| 039 | AL ETC 2 cut-in failure — ETC 2 failed to cut in. | 1. Reduce power. 2. Contact Service. | |
| 044 | L1 Coolant Level Intercooler — Alarm configuration limit value 1: intercooler coolant level too low. | Check coolant level (→ Page 161). | |
| 051 | HI T-Lube Oil — Preliminary warning: lube oil temperature too high. | Reduce power. | |
| 052 | SS T-Lube Oil — Main warning: lube oil temperature too high; engine stop. | 1. Reduce power. 2. Check engine oil level (→ Page 146). | |
| 057 | LO P-Coolant — Preliminary warning: coolant pressure too low. | Check coolant circuit. | |
| 058 | SS P-Coolant — Main warning: coolant pressure too low; engine stop or reduced injection quantity. | 1. Automatic engine shutdown. 2. Check coolant level (→ Page 153). | |
| 063 | HI P-Crankcase — Preliminary warning: crankcase pressure too high. | 1. Reduce power. 2. Replace oil separator element (→ Page 114). | |
| 064 | SS P-Crankcase — Main warning: crankcase pressure too high; engine stop. | 1. Replace oil separator element (→ Page 114). 2. Contact Service. | |
| 315 | AL Timing Cylinder B5 | ||
| 316 | AL Timing Cylinder B6 | ||
| 317 | AL Timing Cylinder B7 | ||
| 318 | AL Timing Cylinder B8 | ||
| 319 | AL Timing Cylinder B9 | ||
| 320 | AL Timing Cylinder B10 | ||
| 321 | AL Wiring Cylinder A1 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 322 | AL Wiring Cylinder A2 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 323 | AL Wiring Cylinder A3 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 324 | AL Wiring Cylinder A4 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 325 | AL Wiring Cylinder A5 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 326 | AL Wiring Cylinder A6 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 327 | AL Wiring Cylinder A7 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 328 | AL Wiring Cylinder A8 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 329 | AL Wiring Cylinder A9 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 330 | AL Wiring Cylinder A10 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 331 | AL Wiring Cylinder B1 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 332 | AL Wiring Cylinder B2 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 333 | AL Wiring Cylinder B3 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 334 | AL Wiring Cylinder B4 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 335 | AL Wiring Cylinder B5 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 336 | AL Wiring Cylinder B6 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 337 | AL Wiring Cylinder B7 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 338 | AL Wiring Cylinder B8 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 339 | AL Wiring Cylinder B9 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 340 | AL Wiring Cylinder B10 — Alarm configuration, cabling fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 341 | AL Open Load Cylinder A1 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 342 | AL Open Load Cylinder A2 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 343 | AL Open Load Cylinder A3 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 344 | AL Open Load Cylinder A4 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 345 | AL Open Load Cylinder A5 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 346 | AL Open Load Cylinder A6 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 347 | AL Open Load Cylinder A7 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 348 | AL Open Load Cylinder A8 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 349 | AL Open Load Cylinder A9 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 350 | AL Open Load Cylinder A10 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 351 | AL Open Load Cylinder B1 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 352 | AL Open Load Cylinder B2 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 353 | AL Open Load Cylinder B3 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 354 | AL Open Load Cylinder B4 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 355 | AL Open Load Cylinder B5 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 356 | AL Open Load Cylinder B6 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 357 | AL Open Load Cylinder B7 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 358 | AL Open Load Cylinder B8 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 359 | AL Open Load Cylinder B9 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 360 | AL Open Load Cylinder B10 — Alarm configuration; disruption fault in injector cabling to cylinder. Result: misfiring. | 1. Check solenoid valve. 2. Contact Service. | |
| 361 | AL Power Stage Low — Alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). If the ITS diagnosis result is "electronics OK", note further fault messages (e.g. cabling faults). | 1. Check solenoid valve cabling. 2. Replace ECU. | |
| 362 | AL Power Stage High — Alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). If the ITS diagnosis result is "electronics OK", note further fault messages (e.g. cabling faults). | 1. Check solenoid valve cabling. 2. Replace ECU. | |
| 363 | AL Stop Power Stage — Alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). | 1. Check cabling. 2. Attempt to restart engine. | |
| 365 | AL Stop MV-Wiring Ground — Alarm configuration; injector cabling fault. If bit "1.1020.021" (Power Stage Failure: stop engine) is set, engine will be shut down as additional measure. | Short circuit of positive connection of one or more injectors to ground; short circuit of negative connection of one or more injectors to ground | 1. Check cabling. 2. Attempt to restart engine. |
| 371 | AL Wiring TO 1 — Alarm configuration; short circuit or wire break on transistor output 1 (TO 1). | 1. Check turbocharger valve/cabling, repair as necessary. 2. Replace ECU. | |
| 372 | AL Wiring TO 2 — Alarm configuration; short circuit or wire break on transistor output 2 (TO 2). | 1. Check recirculation valve/cabling, repair as necessary. 2. Replace ECU. | |
| 373 | AL Wiring TO 3 — Alarm configuration; short circuit or wire break on transistor output 3 (TO 3). | ||
| 374 | AL Wiring TO 4 — Alarm configuration; short circuit or wire break on transistor output 4 (TO 4). | ||
| 381 | AL Wiring TOP 1 — Alarm configuration; short circuit or wire break on transistor output, plant-side 1 (TOP 1). | Check cabling to plant. | |
| 382 | AL Wiring TOP 2 — Alarm configuration; short circuit or wire break on transistor output, plant-side 2 (TOP 2). | Check cabling to plant. | |
| 383 | AL Wiring TOP 3 — Alarm configuration; short circuit or wire break on transistor output, plant-side 3 (TOP 3). | Check cabling to plant. | |
| 384 | AL Wiring TOP 4 — Alarm configuration; short circuit or wire break on transistor output, plant-side 4 (TOP 4). | Check cabling to plant. | |
| 390 | AL MCR exceeded — Alarm configuration; DBR/MCR function: MCR has been exceeded. | 1. If alarm is only temporary, no action required; 2. if alarm is continuously active, contact Service. | |
| 392 | HI T-Coolant Redundant — Alarm configuration limit value 1; preliminary warning: redundant coolant temperature reading too high. | 1. Check cabling. 2. Contact Service. | |
| 393 | SS T-Coolant Redundant — Alarm configuration limit value 1; main warning: redundant coolant temperature reading too high; engine stop. | 1. Check cabling and sensor. 2. Contact Service. | |
| 394 | LO P-Lube Oil Redundant — Alarm configuration limit value 1; preliminary warning: redundant lube oil pressure reading too low. | 1. Check cabling and sensor. 2. Contact Service. | |
| 395 | SS P-Lube Oil Redundant — Alarm configuration limit value 2; main warning: redundant lube oil pressure reading too low. | 1. Check cabling and sensor. 2. Contact Service. | |
| 396 | AL T-Coolant Max Deviation — Alarm configuration; maximum coolant temperature deviation. | 1. Check cabling and sensor. 2. Contact Service. | |
| 397 | AL P-Oil Max Deviation — Alarm configuration; maximum lube oil pressure deviation. | 1. Check cabling and sensor. 2. Contact Service. | |
| 400 | AL Open Load Digital Input 1 — Alarm configuration; line disruption on digital input 1; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 401 | AL Open Load Digital Input 2 — Alarm configuration; line disruption on digital input 2; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 402 | AL Open Load Digital Input 3 — Alarm configuration; line disruption on digital input 3; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 403 | AL Open Load Digital Input 4 — Alarm configuration; line disruption on digital input 4; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 404 | AL Open Load Digital Input 5 — Alarm configuration; line disruption on digital input 5; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 405 | AL Open Load Digital Input 6 — Alarm configuration; line disruption on digital input 6; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 406 | AL Open Load Digital Input 7 — Alarm configuration; line disruption on digital input 7; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 407 | AL Open Load Digital Input 8 — Alarm configuration; line disruption on digital input 8; cabling faulty or no resistance over switch. | 1. Check cabling. 2. Check input of target device. 3. Contact Service. | |
| 473 | AL Cabling PWM_CM2 — Alarm configuration; cable break or short circuit on channel PWM_CM2. | 1. Check cabling. 2. Contact Service. | |
| 474 | AL Wiring FO — Alarm configuration; cable break or short circuit on channel FO. | 1. Check cabling. 2. Contact Service. | |
| 475 | AL CR Trigger Engine Stop — Alarm configuration; tripped by crash recorder triggering due to engine shutdown. | Determine and rectify cause of triggering / engine shutdown. | |
| 476 | AL Crash Rec. Init. Error — Alarm configuration; crash recorder initialization error. | Check setting with DiaSys. | |
| 478 | AL Comb. Alarm Yel (Plant) — Alarm configuration; combined alarm YELLOW from plant. | Note further fault messages. | |
| 479 | AL Comb. Alarm Red — Alarm configuration; combined alarm RED from plant. | Note further fault messages. | |
| 005 | L1 T-CHARGE AIR — Charge-air temperature too high (1st limit value) | Reduce power. Change over to idle and contact Service. | |
| 006 | L2 T-CHARGE AIR — Charge-air temperature too high (2nd limit value) | Reduce power. Change over to idle and contact Service. | |
| 009 | L1 T-INTERCOOLER — Charge-air coolant temperature too high (1st limit value) | Reduce power. Change over to idle and contact Service. | |
| 015 | L1 P-LUBE OIL — Lube oil pressure too low (1st limit value) | Check engine-oil level and top up, if required (→ Page 146). | |
| 016 | L2 P-LUBE OIL — Lube oil pressure too low (2nd limit value); automatic engine shutdown | 1. Check engine-oil level and top up, if required (→ Page 146). 2. Try to re-start the engine (→ Page 57). 3. Contact Service. | |
| 023 | L1 COOLANT LEVEL — Engine coolant level too low | Check coolant level and top up, if required (→ Page 153). | |
| 024 | L2 COOLANT LEVEL — Engine coolant level too low | Check coolant level and top up, if required (→ Page 153). | |
| 030 | ENGINE OVERSPEED — Engine overspeed; automatic engine shutdown | 1. Acknowledge alarm. 2. Try to re-start the engine (→ Page 57). 3. Contact Service. | |
| 044 | L1 LEVEL INTERCOOLER — Charge-air coolant level too low (1st limit value) | Check coolant level and top up, if required (→ Page 161). | |
| 045 | L2 LEVEL INTERCOOLER — Charge-air coolant level too low (2nd limit value) | 1. Check coolant level and top up, if required (→ Page 161). 2. If fault occurs repeatedly: Contact Service. | |
| 051 | L1 T-LUBE OIL — Lube oil temperature too high (1st limit value) | Reduce power. Change over to idle and contact Service. | |
| 052 | L2 T-LUBE OIL — Lube oil temperature too high (2nd limit value) | 1. Reduce power. Change over to idle and contact Service. 2. If fault occurs repeatedly: Contact Service. | |
| 065 | L1 P-FUEL — Fuel supply pressure too low (1st limit value) | 1. Check fuel lines for leaks; repair defective lines. 2. Clean fuel prefilter (→ Page 128). 3. Flush fuel prefilter (→ Page 132). 4. Replace filter element of fuel prefilter (→ Page 134). 5. Replace fuel filter (→ Page 127). 6. If fault is not rectified: Contact Service. | |
| 066 | L2 P-FUEL — Fuel supply pressure too low (2nd limit value) | 1. Check fuel lines for leaks; repair defective lines. 2. Clean fuel prefilter (→ Page 128). 3. Flush fuel prefilter (→ Page 132). 4. Replace filter element of fuel prefilter (→ Page 134). 5. Replace fuel filter (→ Page 127). 6. If fault is not rectified: Contact Service. | |
| 067 | L1 T-COOLANT — Coolant temperature too high (1st limit value) warning | Reduce power. Change over to idle and contact Service. | |
| 068 | L2 T-COOLANT — Coolant temperature too high (2nd limit value); automatic engine shutdown | 1. Allow the engine to cool down. 2. Check coolant cooler (elements etc.) and clean contaminated parts (see manufacturer's documentation). 3. Re-start the engine (→ Page 57). 4. If fault occurs repeatedly: Contact Service. | |
| 069 | L1 T-EXTERN 1 — Violation of first limit for external temperature channel 1 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 070 | L2 T-EXTERN 1 — Violation of second limit for external temperature channel 1 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 071 | L1 T-EXTERN 2 — Violation of first limit for external temperature channel 2 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 072 | L2 T-EXTERN 2 — Violation of second limit for external temperature channel 2 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 073 | L1 P-EXTERN 1 — Violation of first limit for external pressure channel 1 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 074 | L2 P-EXTERN 1 — Violation of second limit for external pressure channel 1 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 075 | L1 P-EXTERN 2 — Violation of first limit for external pressure channel 2 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 076 | L2 P-EXTERN 2 — Violation of second limit for external pressure channel 2 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 077 | LIM EXT. COOLANT LEV. — Alarm from external coolant level monitoring | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 078 | LIM INTERCOOLER LEV. — Alarm from external charge-air coolant level monitoring | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 079 | L Bin-EXTERN 3 — Alarm from external binary channel 3 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 080 | L Bin-EXTERN 4 — Alarm from external binary channel 4 | (Depending on the corresponding measuring point, which is read via CAN bus) | |
| 081 | RAIL LEAKAGE — HP fuel system leaking, system contains air | Contact Service. | |
| 082 | RAIL PRESSURE HIGH — Pressure in HP fuel system exceeds specified value; Solenoid valve of HP fuel control block jamming or wiring to solenoid valve defective | Contact Service. | |
| 083 | RAIL PRESSURE LOW — Pressure in HP fuel system lower than the specified value; HP fuel control block defective or system leaking | Contact Service. | |
| 089 | ENGINE SPEED LOW — Engine speed lower than 200 rpm; automatic engine shutdown | Re-start the engine (→ Page 57). | |
| 090 | IDLE SPEED LOW — Idle speed not reached within a specified period; Termination of starting procedure. | Note further alarms. | |
| 091 | RUN UP SPEED LOW — Run-up speed not reached within a specified period; Termination of starting procedure. | Note further alarms. | |
| 092 | START SPEED LOW — Starter speed not reached within a specified period; Termination of starting procedure. | Note further alarms. | |
| 093 | PREHEAT TEMP. LIMIT2 — Coolant preheating temperature too low during start (2nd limit value); Termination of starting procedure (depending on project design) | Check preheating pump / preheating system (see manufacturer's documentation). | |
| 094 | PREHEAT TEMP. LIMIT1 — Coolant preheating temperature too low during start (1st limit value) | Check preheating pump / preheating system (see manufacturer's documentation). | |
| 100 | EDM NOT VALID — Check sum error of measuring-point data in EDM | If fault occurs repeatedly: Contact Service. | |
| 101 | IDM NOT VALID — Check sum error of measuring-point data in IDM | If fault occurs repeatedly: Contact Service. | |
| 102 | INVALID FUEL CONS. 1 — Check sum error of accumulated fuel consumption data in EDM (redundant data record 1) | If fault occurs repeatedly: Contact Service. | |
| 103 | INVALID FUEL CONS. 2 — Check sum error of accumulated fuel consumption data in EDM (redundant data record 2) | If fault occurs repeatedly: Contact Service. | |
| 104 | OP HOURS1 NOT VALID — Check sum error of hour meter data in EDM | If fault occurs repeatedly: Contact Service. | |
| 105 | OP HOURS2 NOT VALID — Check sum error of hour meter data in IDM | If fault occurs repeatedly: Contact Service. | |
| 106 | ERR REC1 NOT VALID — Check sum error of fault memory in EDM (redundant data record 1) | If fault occurs repeatedly: Contact Service. | |
| 107 | ERR REC2 NOT VALID — Check sum error of fault memory in EDM (redundant data record 2) | If fault occurs repeatedly: Contact Service. | |
| 118 | L1 SUPPLY VOLT. LOW — Supply voltage too low (1st limit value) | Check engine governor supply voltage. | |
| 119 | L2 SUPPLY VOLT. LOW — Supply voltage too low (2nd limit value) | Check engine governor supply voltage. | |
| 120 | L1 SUPPLY VOLT. HIGH — Supply voltage too high (1st limit value) | Check engine governor supply voltage. | |
| 121 | L2 SUPPLY VOLT. HIGH — Supply voltage too high (2nd limit value); automatic engine shutdown (depending on project design) | Check engine governor supply voltage. If engine was stopped: Start engine (→ Page 57). | |
| 122 | L1 T-ELECTRONIC — Temperature in engine governor housing too high (1st limit value) | 1. Improve engine room ventilation. 2. Reduce engine power. Change over to idle and contact Service. | |
| 134 | 15V POS ECU DEFECT — Electronic equipment defective; automatic engine shutdown | Contact Service. | |
| 136 | 15V NEG ECU DEFECT — Electronic equipment defective; automatic engine shutdown | Contact Service. | |
| 137 | L1 5V BUFFER TEST — Power supply for pressure sensors defective. | 1. Disconnect connectors X2 and X3 from engine governor. If alarm does not disappear: Contact Service. 2. Check wiring (pressure sensors). 3. Contact Service. | |
| 138 | SENSORPOWER-DEFECT — Power supply for pressure sensors defective. | 1. Disconnect connectors X2 and X3 from engine governor. If alarm does not disappear: Contact Service. 2. Check wiring (pressure sensors). 3. Contact Service. | |
| 139 | L1 TE BUFFER TEST — Internal electronic fault (temperature sensors) | Contact Service. | |
| 140 | TE BUF. ECU DEFECT — Internal electronic fault (temperature sensors) | Contact Service. | |
| 142 | BANK1 ECU DEFECT — Internal electronic fault; Engine does not start | Contact Service. | |
| 144 | BANK2 ECU DEFECT — Internal electronic fault; Engine does not start | Contact Service. | |
| 145 | 15V_GOOD ECU DEFECT — Electronic equipment defective; automatic engine shutdown | Contact Service. | |
| 146 | L1 AD-TEST1 SUPPLY — A/D-converter supply voltage too low | Contact Service. | |
| 147 | AD-TEST1 ECU DEFECT — Electronic equipment defective; automatic engine shutdown | Contact Service. | |
| 148 | L1 AD-TEST2 SUPPLY — A/D-converter supply voltage too low | Contact Service. | |
| 149 | AD-TEST2 ECU DEFECT — Electronic equipment defective; automatic engine shutdown | Contact Service. | |
| 150 | L1 AD-TEST3 SUPPLY — A/D-converter supply voltage too low | Contact Service. | |
| 151 | AD-TEST3 ECU DEFECT — Electronic equipment defective; automatic engine shutdown | Contact Service. | |
| 170 | MI MODULE FAIL — Module in maintenance predictor either defective or missing | Contact Service. | |
| 171 | MI NOT ACTIVE — Maintenance predictor no more activated | Contact Service. | |
| 173 | MODULE WRITE LIMIT — EEPROM write limit reached | Contact Service. | |
| 180 | CAN1 NODE LOST — At least one device not detected on Default CAN bus | 1. Check wiring (CAN bus). 2. Contact Service. | |
| 181 | CAN2 NODE LOST — At least one device not detected on Redundant CAN bus | 1. Check wiring (CAN bus). 2. Contact Service. | |
| 182 | CAN WRONG PARAMETERS — Consistency error in CAN parameters | Contact Service. | |
| 183 | CAN NO PU-DATA — Error during project design data download in engine governor. | Contact Service. | |
| 184 | CAN PU-DATA EE-FAIL — Error during project design data download in EEPROMs | Contact Service. | |
| 185 | CAN LESS MAILBOXES — Error during CAN initialization. | Contact Service. | |
| 186 | CAN1 BUS OFF — Severe fault on Default CAN bus; automatic change-over to Redundant CAN bus | Contact Service. | |
| 187 | CAN1 ERROR PASSIVE — Light fault on Default CAN bus (e.g. short-time overload) | (none) | |
| 188 | CAN2 BUS OFF — Severe fault on Redundant CAN bus; automatic change-over to Default CAN bus | Contact Service. | |
| 189 | CAN2 ERROR PASSIVE — Light fault on Redundant CAN bus (e.g. short-time overload) | (none) | |
| 201 | SD T-COOLANT — Sensor defect (coolant temperature) | 1. Check wiring. 2. Contact Service. | |
| 202 | SD T-FUEL — Sensor defect (Fuel temperature) | 1. Check wiring. 2. Contact Service. | |
| 203 | SD T-CHARGE AIR — Sensor defect (charge-air temperature) | 1. Check wiring. 2. Contact Service. | |
| 205 | SD T-COOLANT INTERC. — Sensor defect (charge-air coolant temperature) | 1. Check wiring. 2. Contact Service. | |
| 208 | SD P-CHARGE AIR — Sensor defect (charge-air pressure) | 1. Check wiring. 2. Contact Service. | |
| 211 | SD P-LUBE OIL — Sensor defect (lube oil pressure) | 1. Check wiring. 2. Contact Service. | |
| 215 | SD P-RAIL FUEL — Sensor defect (common rail pressure); HP controller in emergency mode | 1. Check wiring. 2. Contact Service. | |
| 216 | SD T-LUBE OIL — Sensor defect (lube oil temperature) | 1. Check wiring. 2. Contact Service. | |
| 220 | SD COOLANT LEVEL — Sensor defect (coolant level) | 1. Check wiring. 2. Contact Service. | |
| 223 | SD LEVEL INTERCOOLER — Sensor defect (charge-air coolant level) | 1. Check wiring. 2. Contact Service. | |
| 229 | SD ENG.SPEED SENSORS — Sensor defect (crankshaft speed) and sensor defect (camshaft speed) | 1. Check wiring. 2. Contact Service. | |
| 230 | SD CRANKSHAFT SPEED — Sensor defect (crankshaft speed) | 1. Check wiring. 2. Contact Service. | |
| 231 | SD CAMSHAFT SPEED — Sensor defect (camshaft speed) | 1. Check wiring. 2. Contact Service. | |
| 240 | SD P-FUEL — Sensor defect (fuel pressure) | 1. Check wiring. 2. Contact Service. | |
| 245 | SD POWER SUPPLY — Sensor defect (engine governor operating voltage) | Contact Service. | |
| 246 | SD T-ELECTRONIC — Sensor defect (temperature in engine governor) | Contact Service. | |
| 250 | SD CAN SPEED DEMAND — Sensor defect (CAN nominal speed demand) | 1. Check speed transmitter. 2. Check wiring (CAN bus). 3. Contact Service. | |
| 266 | SD SPEED DEMAND AN. — Sensor defect (analog nominal speed demand) | 1. Check speed transmitter. 2. Check wiring. 3. Contact Service. | |
| 267 | SD SP.DEM.TEST BENCH — Sensor defect (analog speed demand); NOTE: Only used in test-stand operation. | 1. Check speed transmitter. 2. Check wiring. 3. Contact Service. | |
| 270 | SD SPEED DEMAND FI1 — Sensor defect (frequency input for speed demand) | 1. Check speed transmitter. 2. Check wiring. 3. Contact Service. | |
| 272 | SD T-EXTERN 2 — External device defective (CAN T-EXTERN 2) | Contact Service. | |
| 273 | SD P-EXTERN 1 — External device defective (CAN P-EXTERN 1) | Contact Service. | |
| 274 | SD P-EXTERN 2 — External device defective (CAN P-EXTERN 2) | Contact Service. | |
| 275 | SD EXT.COOLANT LEVEL — External coolant-level monitoring defective (CAN) | Contact Service. | |
| 276 | SD INTERCOOLER LEVEL — External charge-air coolant-level monitoring defective (CAN) | Contact Service. | |
| 277 | SD BIN-EXTERN 3 — External device defective (CAN BIN-EXTERN 3) | Contact Service. | |
| 278 | SD BIN-EXTERN 4 — External device defective (CAN BIN-EXTERN 4) | Contact Service. | |
| 301 | TIMING Injection timing fault cylinder A1 — CYLINDER A1 | If fault occurs repeatedly: Contact Service. | |
| 302 | TIMING Injection timing fault cylinder A2 — CYLINDER A2 | If fault occurs repeatedly: Contact Service. | |
| 303 | TIMING Injection timing fault cylinder A3 — CYLINDER A3 | If fault occurs repeatedly: Contact Service. | |
| 304 | TIMING Injection timing fault cylinder A4 — CYLINDER A4 | If fault occurs repeatedly: Contact Service. | |
| 305 | TIMING Injection timing fault cylinder A5 — CYLINDER A5 | If fault occurs repeatedly: Contact Service. | |
| 306 | TIMING Injection timing fault cylinder A6 — CYLINDER A6 | If fault occurs repeatedly: Contact Service. | |
| 307 | TIMING Injection timing fault cylinder A7 — CYLINDER A7 | If fault occurs repeatedly: Contact Service. | |
| 308 | TIMING Injection timing fault cylinder A8 — CYLINDER A8 | If fault occurs repeatedly: Contact Service. | |
| 309 | TIMING Injection timing fault cylinder A9 — CYLINDER A9 | If fault occurs repeatedly: Contact Service. | |
| 310 | TIMING Injection timing fault cylinder A10 — CYLINDER A10 | If fault occurs repeatedly: Contact Service. | |
| 311 | TIMING Injection timing fault cylinder B1 — CYLINDER B1 | If fault occurs repeatedly: Contact Service. | |
| 312 | TIMING Injection timing fault cylinder B2 — CYLINDER B2 | If fault occurs repeatedly: Contact Service. | |
| 313 | TIMING Injection timing fault cylinder B3 — CYLINDER B3 | If fault occurs repeatedly: Contact Service. | |
| 314 | TIMING Injection timing fault cylinder B4 — CYLINDER B4 | If fault occurs repeatedly: Contact Service. | |
| 315 | TIMING Injection timing fault cylinder B5 — CYLINDER B5 | If fault occurs repeatedly: Contact Service. | |
| 316 | TIMING Injection timing fault cylinder B6 — CYLINDER B6 | If fault occurs repeatedly: Contact Service. | |
| 317 | TIMING Injection timing fault cylinder B7 — CYLINDER B7 | If fault occurs repeatedly: Contact Service. | |
| 318 | TIMING Injection timing fault cylinder B8 — CYLINDER B8 | If fault occurs repeatedly: Contact Service. | |
| 319 | TIMING Injection timing fault cylinder B9 — CYLINDER B9 | If fault occurs repeatedly: Contact Service. | |
| 320 | TIMING Injection timing fault cylinder B10 — CYLINDER B10 | If fault occurs repeatedly: Contact Service. | |
| 321 | WIRING CYLINDER A1 Misfiring | Faulty wiring to solenoid valve cylinder A1 | 1. Check wiring.; 2. Contact Service. |
| 322 | WIRING CYLINDER A2 Misfiring | Faulty wiring to solenoid valve cylinder A2 | 1. Check wiring.; 2. Contact Service. |
| 323 | WIRING CYLINDER A3 Misfiring | Faulty wiring to solenoid valve cylinder A3 | 1. Check wiring.; 2. Contact Service. |
| 324 | WIRING CYLINDER A4 Misfiring | Faulty wiring to solenoid valve cylinder A4 | 1. Check wiring.; 2. Contact Service. |
| 325 | WIRING CYLINDER A5 Misfiring | Faulty wiring to solenoid valve cylinder A5 | 1. Check wiring.; 2. Contact Service. |
| 326 | WIRING CYLINDER A6 Misfiring | Faulty wiring to solenoid valve cylinder A6 | 1. Check wiring.; 2. Contact Service. |
| 327 | WIRING CYLINDER A7 Misfiring | Faulty wiring to solenoid valve cylinder A7 | 1. Check wiring.; 2. Contact Service. |
| 328 | WIRING CYLINDER A8 Misfiring | Faulty wiring to solenoid valve cylinder A8 | 1. Check wiring.; 2. Contact Service. |
| 329 | WIRING CYLINDER A9 Misfiring | Faulty wiring to solenoid valve cylinder A9 | 1. Check wiring.; 2. Contact Service. |
| 330 | WIRING CYLINDER A10 Misfiring | Faulty wiring to solenoid valve cylinder A10 | 1. Check wiring.; 2. Contact Service. |
| 331 | WIRING CYLINDER B1 Misfiring | Faulty wiring to solenoid valve cylinder B1 | 1. Check wiring.; 2. Contact Service. |
| 332 | WIRING CYLINDER B2 Misfiring | Faulty wiring to solenoid valve cylinder B2 | 1. Check wiring.; 2. Contact Service. |
| 333 | WIRING CYLINDER B3 Misfiring | Faulty wiring to solenoid valve cylinder B3 | 1. Check wiring.; 2. Contact Service. |
| 334 | WIRING CYLINDER B4 Misfiring | Faulty wiring to solenoid valve cylinder B4 | 1. Check wiring.; 2. Contact Service. |
| 335 | WIRING CYLINDER B5 Misfiring | Faulty wiring to solenoid valve cylinder B5 | 1. Check wiring.; 2. Contact Service. |
| 270 SO | Frequency Input SD alarm configuration; frequency input faulty; short circuit or wire break. | 1. Check cabling. 2. Check setpoint speed transmitter. | |
| 361 AL | Power Stage Low SD alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). If the ITS diagnosis result is “electronics OK | 1. Check solenoid valve cabling. 2. Replace ECU. | |
| 362 AL | Power Stage High SD alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). If the ITS diagnosis result is “electronics OK | 1. Check solenoid valve cabling. 2. Replace ECU. | |
| 363 AL | Stop Power Stage SD alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). If the ITS diagnosis result is “electronics OK | 1. Check cabling. 2. Attempt to restart engine. | |
| 365 AL | Stop MV-Wiring SD alarm configuration; injector Ground cabling fault. If bit"1.1020.021” is set, engine will be shut down as additional measure. | 1. Check cabling. 2. Attempt to restart engine. | |
| 371 AL | Wiring TO 1 SD alarm configuration; short circuit or wire break on turbocharger transistor output 1 (TO 1). | 1. Check turbocharger valve/cabling, repair as necessary. 2. Replace ECU. | |
| 372 AL | Wiring TO 2 SD alarm configuration; short circuit or wire break on recirculation transistor output 2 (TO 2). | 1. Check turbocharger valve/cabling, repair as necessary. 2. Replace ECU. | |
| 373 AL | Wiring TO 3 SD alarm configuration; short circuit or wire break on transistor output 3 (TO 3) | ||
| 087 | AL Rail Leakage | Contact Service. | |
| 084 | HI P-Fuel (Common Rail pressure > reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty. | Contact Service. | |
| 085 | LO P-Fuel (Common Rail pressure < reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty. | Contact Service. | |
| 095 | AL Prelubrication Fault | Check oil priming system. |
| Symptom | Cause | Remedy |
|---|---|---|
| Engine does not turn when starter is actuated | Battery low or defective | Charge or replace (see manufacturer's documentation). |
| Engine does not turn when starter is actuated | Cable connections defective | Check if cable connections are properly secured (see manufacturer's documentation). |
| Engine does not turn when starter is actuated | Engine wiring or starter defective | Check if cable connections are properly secured, contact Service. |
| Engine does not turn when starter is actuated | Engine wiring defective | Check (→ Page 171). |
| Engine does not turn when starter is actuated | Secure seating of assemblies or connectors not provided | Perform visual inspection (see manufacturer's documentation). |
| Engine does not turn when starter is actuated | Plug-in connections are loose | Check plug connections (→ Page 173). |
| Engine does not turn when starter is actuated | Running gear blocked (engine cannot be barred manually) | Contact Service. |
| Engine turns but does not fire | Poor rotation by starter: battery low or defective | Charge or replace battery (see manufacturer's documentation). |
| Engine turns but does not fire | Engine wiring defective | Check (→ Page 171). |
| Engine turns but does not fire | Fuel system not vented | Vent fuel system (→ Page 126). |
| Engine turns but does not fire | ECU defective | Contact Service. |
| Engine fires unevenly | Injector defective | Replace (→ Page 121). |
| Engine fires unevenly | Engine wiring defective | Check (→ Page 171). |
| Engine fires unevenly | Fuel system not vented | Vent fuel system (→ Page 126). |
| Engine fires unevenly | ECU defective | Contact Service. |
| Engine does not reach nominal speed | Fuel prefilter clogged | Replace (→ Page 134). |
| Engine does not reach nominal speed | Easy-change fuel filter clogged | Replace (→ Page 127). |
| Engine does not reach nominal speed | Air filter clogged | Check signal ring position of service indicator (→ Page 141). |
| Engine does not reach nominal speed | Injector defective | Replace (→ Page 121). |
| Engine does not reach nominal speed | Engine wiring defective | Check (→ Page 171). |
| Engine does not reach nominal speed | Engine overloaded | Contact Service. |
| Engine speed not steady | Injector defective | Replace (→ Page 121). |
| Engine speed not steady | Speed sensor defective | Contact Service. |
| Engine speed not steady | Fuel system not vented | Vent fuel system (→ Page 126). |
| Engine speed not steady | ECU defective | Contact Service. |
| Charge-air temperature too high | Incorrect coolant concentration | Check (MTU test kit). |
| Charge-air temperature too high | Intercooler contaminated | Contact Service. |
| Charge-air temperature too high | Air-intake temperature too high | Check fans and air supply / ventilation ducts. |
| Charge-air pressure too low | Air filter clogged | Check signal ring position of service indicator (→ Page 141). |
| Charge-air pressure too low | Intercooler contaminated | Contact Service. |
| Charge-air pressure too low | Exhaust turbocharger defective | Contact Service. |
| Coolant leaks on intercooler | Intercooler leaking, major coolant discharge | Contact Service. |
| Exhaust gas black | Air filter clogged | Check signal ring position of service indicator (→ Page 141). |
| Exhaust gas black | Injector defective | Replace (→ Page 121). |
| Exhaust gas black | Engine overloaded | Contact Service. |
| Exhaust gas blue | Too much engine oil in engine | Drain engine oil (→ Page 147). |
| Exhaust gas blue | Oil separator of crankcase breather contaminated | Replace (→ Page 114). |
| Exhaust gas blue | Exhaust turbocharger, cylinder head, piston rings, cylinder liner defective | Contact Service. |
| Exhaust gas white | Engine not at operating temperature | Run engine to reach operating temperature. |
| Exhaust gas white | Water in fuel | Check fuel system on fuel prefilter; drain fuel prefilter (→ Page 130). |
| Exhaust gas white | Intercooler leaking | Contact Service. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Battery low or defective; Cable connections defective; Engine wiring or starter defective; Engine wiring defective. See the table for the matching fixes.
Documented causes: Fuel prefilter clogged; Easy-change fuel filter clogged; Air filter clogged; Injector defective. See the table for the matching fixes.
Documented causes: Poor rotation by starter: battery low or defective; Engine wiring defective; Fuel system not vented; ECU defective. See the table for the matching fixes.