177 MTU generator fault/alarm codes with symptom, cause and remedy — compiled from MTU service and controller documentation.
| Code | Meaning / symptom | Cause | Remedy |
|---|---|---|---|
| 003 | Preliminary warning: fuel temperature too high. | Contact Service. | |
| 004 | Main warning: fuel temperature too high; engine stop. | Contact Service. | |
| 005 | Preliminary warning: charge-air temperature too high. | Reduce power. Check intercooler. | |
| 006 | Main warning: charge-air temperature too high; engine stop. | Reduce power. Check intercooler. | |
| 009 | Preliminary warning: coolant Intercooler temperature in intercooler too low. | Reduce power. | |
| 010 | Main warning: charge-air coolant temperature too high; engine stop. | Reduce power. | |
| 015 | Preliminary warning: lube oil pressure too low. | Check oil level, top up as necessary (— Page 146). | |
| 016 | Lube oil pressure too low (2nd limit value) | Check engine-oil level and top up, if required automatic engine shutdown Try to re-start the engine Contact Service. | |
| 019 | Exhaust gas temperature (A-side) too high. | Check cabling (— Page 194), Contact Service. | |
| 020 | Exhaust gas temperature (A-side) too high; engine shutdown. | Check cabling (— Page 194), Contact Service. | |
| 021 | Exhaust gas temperature (B-side) too high. | Check cabling (— Page 194), Contact Service. | |
| 022 | Exhaust gas temperature (B-side) too high; engine shutdown. | Check cabling (— Page 194), Contact Service. | |
| 023 | Engine coolant level too low LEVEL (— Page 153) | Check coolant level and top up, if required | |
| 024 | SS Coolant Level | Check coolant level. | |
| 025 | Oil filter differential pressure too high. | Replace oil filter (— Page 173). | |
| 026 | HI P-Diff. Lube Oil | Replace oil filter (— Page 173). | |
| 027 | Leak-fuel level too high. | Check fuel system, Contact Service. | |
| 029 | Idle speed of ETC 2 too high. | Contact Service. | |
| 030 | Engine overspeed; automatic engine shutdown | Acknowledge alarm. Try to re-start the engine Contact Service. | |
| 031 | Speed of primary turbocharger too high. | Contact Service. | |
| 032 | SS ETC 1 overspeed | 1. Automatic power reduction by engine control system. 2. Check air filters (— Page 164). | |
| 033 | HI P-Diff-Fuel | Replace fuel filter (— Page 153). | |
| 034 | SS P-Diff-Fuel | Replace fuel filter (— Page 153). | |
| 036 | HI ETC 2 Overspeed | Reduce power. Contact Service. | |
| 037 | SS ETC 2 Overspeed | Reduce power. Contact Service. | |
| 038 | AL ETC Speed Deviation | Synchronization fault between primary turbocharger and one of the secondary turbochargers. | Reduce power. Contact Service. |
| 039 | AL ETC 2 Cutin Failure | Reduce power. Contact Service. | |
| 044 | Charge-air coolant level too low INTERCOOLER (1st limit value) | Check coolant level and top up, if required | |
| 045 | Charge-air coolant level too low INTERCOOLER (2nd limit value) | Check coolant level and top up, if required If fault occurs repeatedly: Contact Service. | |
| 051 | Lube oil temperature too high (1st limit value) | Reduce power. Change over to idle and contact Service. | |
| 052 | Lube oil temperature too high (2nd limit value) | Reduce power. Change over to idle and contact Service. If fault occurs repeatedly: Contact Service. | |
| 057 | LOP-Coolant | Check coolant circuit. | |
| 058 | SS P-Coolant | Automatic engine shutdown. Check coolant level (— Page 176). | |
| 059 | SS T-Coolant L3 | Allow engine to cool down; Check coolant cooler, clean if necessary. Contact Service. | |
| 060 | SS T-Coolant L4 | Allow engine to cool down; Check coolant cooler, clean if necessary. Contact Service. | |
| 063 | HI P-Crankcase | Reduce power. Replace oil separator element (— Page 138). | |
| 064 | SS P-Crankcase | Replace oil separator element (— Page 138). Contact Service. | |
| 065 | Fuel supply pressure too low (ist limit value) | Check fuel lines for leaks; repair defective lines. Clean fuel prefilter Flush fuel prefilter Replace filter element of fuel prefilter Replace fuel filter If fault is not rectified: Contact Service. | |
| 066 | Fuel supply pressure too low (2nd limit value) | Check fuel lines for leaks; repair defective lines. Clean fuel prefilter Flush fuel prefilter Replace filter element of fuel prefilter Replace fuel filter If fault is not rectified: Contact Service. | |
| 067 | Coolant temperature too high (tst limit value) | Reduce power. Change over to idle and warning contact Service. | |
| 068 | Coolant temperature too high (2nd limit value) | Allow the engine to cool down. Check coolant cooler (elements etc.) clean contaminated parts (see manufacturer’s documentation). Re-start the engine If fault occurs repeatedly: Contact Service. | |
| 069 | Violation of first limit for external temperature channel 1 point, which is read via CAN bus | ||
| 070 | Violation of second limit for external temperature channel 1 point, which is read via CAN bus | ||
| 071 | Violation of first limit for external temperature channel 2 | (Depending on the corresponding measuring point, which is read via CAN bus) | ||
| 072 | Violation of second limit for external temperature channel 2 point, which is read via CAN bus | ||
| 073 | Violation of first limit for external pressure channel 1 point, which is read via CAN bus | ||
| 074 | Violation of second limit for external pressure channel 1 point, which is read via CAN bus | ||
| 075 | Violation of first limit for external pressure channel 2 point, which is read via CAN bus | ||
| 076 | Violation of second limit for external pressure channel 2 point, which is read via CAN bus | ||
| 081 | AL Rail Leakage | Contact Service. | |
| 082 | HI P-Fuel (Common Rail) | Contact Service. | |
| 083 | LO P-Fuel (Common Rail) | 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 | HI T-Recirculation | Reduce power. | |
| 086 | HI T-Recirculation | Reduce power. | |
| 087 | AL Rail Leakage | Contact Service. | |
| 089 | SS Engine Speed too Low | Check for additional messages. | |
| 090 | SS Starter Speed Not Reached | Contact Service. | |
| 091 | SS Release Speed Not Reached | Contact Service. | |
| 092 | SS Starter Speed Not Reached | Contact Service. | |
| 093 | SS T-Preheat | Check preheater. | |
| 094 | LO T-Preheat | Check preheater. | |
| 095 | AL Prelubrication Fault | Check oil priming system. | |
| 101 | Lube-oil temperature before engine, shutdown | ||
| 102 | AL Consumption Meter Faulty | Contact Service. | |
| 104 | AL Eng Hours Counter Defect | Contact Service. | |
| 118 | LO ECU Supply Voltage | Check ECU supply voltage. Contact Service. | |
| 119 | LOLO ECU Supply Voltage | Check ECU supply voltage. Contact Service. | |
| 120 | HI ECU Supply Voltage | Check ECU supply voltage. Contact Service. | |
| 121 | HIH] ECU Supply Voltage | Check ECU supply voltage. Contact Service. | |
| 134 | 15V POS ECU DEFECT | Replace ECU. | |
| 136 | 15V NEG ECU DEFECT | Contact Service. | |
| 142 | BANK1 ECU DEFECT | Replace ECU. | |
| 144 | BANK2 ECU DEFECT | Replace ECU. | |
| 150 | Li AD-TEST3 SUPPLY | Replace ECU. | |
| 27 | Undervoltage | ||
| 27-1 | Trip Alarm | ||
| 27-2 | Trip Alarm | ||
| 270 SO | Frequency Input SD alarm configuration; frequency input faulty; short circuit or wire break. | 1. Check cabling. 2. Check setpoint speed transmitter. | |
| 3 | Engine kW Overload | ||
| 32 | Trip Alarm | ||
| 32R | Reverse Power | ||
| 33 | Fuel filter differential pressure too high. | Replace fuel filter (— Page 153). | |
| 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) | ||
| 40 | Trip Alarm | ||
| 401 | Lube oil pressure before engine, shutdown | ||
| 40Q | Loss of Excitation | ||
| 442 - AL L2 P-Aux 1 | Pressure signal of Aux 1 has exceeded / not attained limit value 2, depending on configuration. | Sensor defect of injector power stage; internal fault of engine governor. | Replace ECU. |
| 445 | Ambient air pressure sensor faulty. | Replace ECU. | |
| 448 | Charge-air pressure too high. | Contact Service. | |
| 450 | Input signal for idle/end torque faulty; short circuit or wire break. | Check signal transmitter and cabling, replace as necessary. Error cleared after restarting the engine. | |
| 454 | Power reduction is active. | Note further fault messages. Determine and rectify reason for power reduction. | |
| 460 | EMU exhaust gas temperature value too high. | Check cabling. Contact Service. | |
| 461 | EMU exhaust gas temperature value too low. | Check cabling. Contact Service. | |
| 462 | EMU coolant temperature value too high / low. | Check configuration with DiaSys. | |
| 464 - SD P-AUX 1 | Analog pressure input signal for Aux 1 faulty; short circuit or wire break. | Check pressure transmitter and cabling, replace as necessary. Error cleared after restarting the engine. | |
| 467 - AL L2 T-Aux 1 | Temperature signal of Aux 1 has exceeded / not attained limit value 2, depending on configuration. | Determine and rectify reason for limit value violation. | |
| 468 - SD T-AUX 1 | Analog input for Aux 1 temperature faulty. | Replace ECU. | |
| 469 - SD AUX 1 | Analog input signal for Aux 1 faulty; short circuit or wire break. | Check signal transmitter and cabling, replace as necessary. | |
| 47 | Trip Alarm | ||
| 470 | Temperature sensor for ECU faulty; short circuit or wire break. | Check sensor and cabling, replace as necessary. Error cleared after restarting the engine. | |
| 471 -- SD Coil Current | Control circuit for suction restrictor faulty; short circuit or wire break. | Check sensor and cabling, replace as necessary. Error cleared after restarting the engine. | |
| 472 | Engine shutdown, since all shutdown channels have 'sensor faulty’. | Check cabling. Contact Service. | |
| 473 - AL Cabling PWM_CM2 | Cable break or short circuit on channel PWM_CM2. | Check cabling. Contact Service. | |
| 474 | Cable break or short circuit on channel FO. | Check cabling. Contact Service. | |
| 475 | Tripped by crash recorder triggering due to engine shutdown. | Determine and rectify cause of triggering / engine shutdown. | |
| 476 | Crash recorder initialization error. | Check setting with DiaSys. | |
| 478 | Combined alarm YELLOW from plant. | Note further fault messages. | |
| 479 | Combined alarm RED from plant. | Note further fault messages. | |
| 482 | Exhaust temperature sensor on A-side faulty; short circuit or wire break. | Check sensor and cabling (B4.23), replace as necessary. | |
| 484 | Exhaust gas temperature (C-side) too high. | Reduce power. Contact Service. | |
| 485 | Exhaust gas temperature (C-side} too high. | Reduce power. | |
| 51 | Generator Overcurrent | ||
| 51-1 | Trip Alarm | ||
| 51-2 | Trip Alarm | ||
| 51-3 | Trip Alarm | ||
| 59 | Overvoltage | ||
| 59-1 | Trip Alarm | ||
| 59-2 | Trip Alarm | ||
| 78 | Vector Shift Trip | ||
| 78 Vector Shift and 81 ROCOF | Loss of Mains Protection | ||
| 81 | ROCOF (Rate of Change of Frequency) (Optional) | ||
| 81 ROCOF | Trip Pre-Alarm | ||
| 81O | Trip Alarm | ||
| 81ROCOF | Rate of Change of Frequency | ||
| 81U | Trip Alarm | ||
| 99 | Lube-oil temperature before engine, shutdown | ||
| ADEC | Engine governor ADEC (ECU 7) for Series 4000 genset engines - Fault messages | ||
| AL MCR exceeded | DBR/MCR Function: MCR (Maximum Continuous Rating) is exceeded. | ||
| AL Open Load | Open load in injector cable of cylinder B2 | Check cable and solenoid if open load (e.g. replace injector) ==> after cycle curing of failure | |
| AL Power Stage Low | Internal error of electronic (electronic defect possible) | Start ITS ==> if electronic o.k. continue to pay attention to messages. If bit "1.1020.021" (Power Stage Failure: Stop Engine) set ==> Engine stop. | |
| AL Wiring TO 1 | Short circuit or open load on transistor output 1 (TO 1). | ||
| AL Wiring TO 2 | Short circuit or open load on transistor output 2 (TO 2). | ||
| AL Wiring TO 3 | Short circuit or open load on transistor output 3 (TO 3). | ||
| AL Wiring TO 4 | Short circuit or open load on transistor output 4 (TO 4). | ||
| AL Wiring TOP 1 | Short circuit or open load on transistor output plant 1 (TOP 1). | ||
| AL Wiring TOP 2 | Short circuit or open load on transistor output plant 2 (TOP 2). | ||
| AL Wiring TOP 3 | Short circuit or open load on transistor output plant 3 (TOP 3). | ||
| AL Wiring TOP 4 | Short circuit or open load on transistor output plant 4 (TOP 4). | ||
| Alarm Cooldown=4 | Status Only=0, Pre-Alarm=1, Alarm=2, Alarm Unload=3, Alarm Cooldown=4, Alarm Unload Cooldown=5 | ||
| Alarm Unload Cooldown=5 | Status Only=0, Pre-Alarm=1, Alarm=2, Alarm Unload=3, Alarm Cooldown=4, Alarm Unload Cooldown=5 | ||
| Alarm Unload=3 | Status Only=0, Pre-Alarm=1, Alarm=2, Alarm Unload=3, Alarm Cooldown=4, Alarm Unload Cooldown=5 | ||
| Alarm=2 | Status Only=0, Pre-Alarm=1, Alarm=2, Alarm Unload=3, Alarm Cooldown=4, Alarm Unload Cooldown=5 | ||
| HI T-Coolant Red | Redundant coolant temperature too high (limit 1) | Check circulation of coolant | |
| LO P-Lube Oil Red | Redundant pressure of lube oil too low (limit 1). | ||
| Pre-Alarm=1 | Status Only=0, Pre-Alarm=1, Alarm=2, Alarm Unload=3, Alarm Cooldown=4, Alarm Unload Cooldown=5 | ||
| SD CAN OVERRIDE 253 | Missing Data CAN function not possible activate | Electronic-Service | |
| SD CAN SPEED DEMAND 250 | Missing Data CAN Speed Demand not valid if fault still valid => | Take the command to the RCS directly after power on, | |
| SD CAN STOP 249 | Missing Data CAN kein Engine-Stop | Electronic-Service | |
| SD CAN TEST OVERSP 254 | Missing Data CAN function not possible to activate | Electronic-Service | |
| SD CAN UP/DOWN 251 | Missing Data CAN No Anderung der _ | Electronic-Service | |
| SD CHARGER SPEED | 232 | Sensor defect, Short Circuit or Cable breakage togeschaltet Ablevel des Sensors check | Wiring und Sensor to B44 check | |
| SD CRANKSHAFT SPEED 230 | Sensor defect, Short Circuit or Cable breakage | Wiring und Sensor to B/3 check | |
| SD P-CHARGE AIR 208 | Sensor defect, Short Circuit or Cable breakage Xx X | Wiring und Sensor to BJO check | |
| SD P-CRANKCASE 214 | Sensor defect, Short Circuit or Cable breakage _ inactive | Wiring und Sensor to B50 check | |
| SD P-RAIL FUEL 215 | Sensor defect, Short Circuit or Cable breakage Notbetrieb | HD-Regler Wiring und Sensor to B48 check | |
| SD T-COOLANT 201 | Sensor defect, Short Circuit or Cable breakage inactive | Limit-Monitoring Wiring und Sensor to B6 check | |
| SD T-TE10 217 | Free Channel | ||
| SEO03 | Nd11 231 | Contact Service. | |
| SEO03 nd11 231 | High Temperature | Contact Service. | |
| SS P-Lube Oil Red | Redundant pressure of lube oil too low (limit 2). | ||
| SS T-Coolant Red | Redundant coolant temperature too high (limit 2) | Check circulation of coolant | |
| SYS_ERR_CAN_A_BUS_OFF | First line: C = Alarm was active during the last four to twelve hours Second line: Running text, providing more information about the fault currently displayed | ||
| SYS_ERR_CAN_A_OVERRUN | First line: E = Alarm was active more than twelve hours ago Second line: Running text, providing more information about the fault currently displayed | ||
| SYS_ERR_SUPPLY | First line: C = Alarm was active during the last four hours Second line: Running text, providing more information about the fault currently displayed | ||
| SYS_ERR_SUPPLY_SD | First line: B = Alarm was active during the last hour Second line: Running text, providing more information about the fault currently displayed | ||
| SYS_ERR_TEMP | First line: A = Currently active alarms Second line: Running text, providing more information about the fault currently displayed | ||
| SYS_ERR_TEMP_SD | First line: # (2) = Alarm is no longer active, does not appear on next power-up Second line: Running text, providing more information about the fault currently displayed | ||
| Status Only=0 | Status Only=0, Pre-Alarm=1, Alarm=2, Alarm Unload=3, Alarm Cooldown=4, Alarm Unload Cooldown=5 | ||
| TD P-Oil Sensor Deviation | Maximum deviation of P-Oil sensors | ||
| TD T-Coolant Sensor Deviation | Maximum deviation of T-Coolant sensors |
Compiled from MTU service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.
Preliminary warning: fuel temperature too high.. Remedy: Contact Service..
Main warning: fuel temperature too high; engine stop.. Remedy: Contact Service..
Preliminary warning: charge-air temperature too high.. Remedy: Reduce power. Check intercooler..
Main warning: charge-air temperature too high; engine stop.. Remedy: Reduce power. Check intercooler..
Preliminary warning: coolant Intercooler temperature in intercooler too low.. Remedy: Reduce power..
Main warning: charge-air coolant temperature too high; engine stop.. Remedy: Reduce power..
Preliminary warning: lube oil pressure too low.. Remedy: Check oil level, top up as necessary (— Page 146)..
Lube oil pressure too low (2nd limit value). Remedy: Check engine-oil level and top up, if required automatic engine shutdown Try to re-start the engine Contact Service..
Exhaust gas temperature (A-side) too high.. Remedy: Check cabling (— Page 194), Contact Service..
Exhaust gas temperature (A-side) too high; engine shutdown.. Remedy: Check cabling (— Page 194), Contact Service..
Exhaust gas temperature (B-side) too high.. Remedy: Check cabling (— Page 194), Contact Service..
Exhaust gas temperature (B-side) too high; engine shutdown.. Remedy: Check cabling (— Page 194), Contact Service..
Engine coolant level too low LEVEL (— Page 153). Remedy: Check coolant level and top up, if required.
SS Coolant Level. Remedy: Check coolant level..
Oil filter differential pressure too high.. Remedy: Replace oil filter (— Page 173)..
HI P-Diff. Lube Oil. Remedy: Replace oil filter (— Page 173)..
Leak-fuel level too high.. Remedy: Check fuel system, Contact Service..
Idle speed of ETC 2 too high.. Remedy: Contact Service..
Engine overspeed; automatic engine shutdown. Remedy: Acknowledge alarm. Try to re-start the engine Contact Service..
Speed of primary turbocharger too high.. Remedy: Contact Service..