MTU 16 V 4000 G23 troubleshooting: 59 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
MTU 16 V 4000 G23 — full specs, parts & maintenance.
| Code | Meaning | Remedy |
|---|---|---|
| ADEC | Engine governor ADEC (ECU 7) for Series 4000 genset engines - Fault messages | |
| 003 | HI T-Fuel | Contact Service. |
| 004 | SS T-Fuel | Contact Service. |
| 005 | HI T-Charge Air | 1. Reduce power. 2. Check intercooler. |
| 006 | SS T-Charge Air | Contact Service. |
| 015 | AL L1 T-Coolant Intercooler | |
| 016 | SS P-Lube Oil | 1. Check oil level, top up as necessary (→ Page 134). 2. Attempt to restart engine (→ Page 57). |
| 019 | HI T-Exhaust A | Check cabling (→ Page 155). |
| 020 | SS T-Exhaust A | Contact Service. |
| 021 | HI T-Exhaust B | Check cabling (→ Page 155). |
| 022 | SS T-Exhaust B | Contact Service. |
| 023 | LO Coolant Level | |
| 024 | SS Coolant Level | |
| 025 | HI P-Diff. Lube Oil | |
| 026 | HI P-Diff. Lube Oil | |
| 027 | HI Leak Fuel Level | |
| 009 | AL L1 T-Coolant | Reduce power. |
| 010 | AL L2 T-Coolant | Reduce power. Check intercooler. |
| 029 | HI ETC 2 idle speed | Contact Service. |
| 030 | SS Engine Speed | Acknowledge alarm. Attempt to restart engine. |
| 031 | HI ETC 1 overspeed | Contact Service. |
| 032 | SS ETC 1 overspeed | Reduce power. Check air filters. |
| 036 | HI ETC 2 overspeed | Reduce power. Contact Service. |
| 037 | SS ETC 2 overspeed | Reduce power. Contact Service. |
| 038 | AL ETC Synchro Fault | Reduce power. Contact Service. |
| 039 | AL ETC 2 cut-in failure | Reduce power. Contact Service. |
| 044 | L1 Coolant Level | Check coolant level. |
| 051 | HI T-Lube Oil | Reduce power. |
| 052 | SS T-Lube Oil | Reduce power. Check engine oil level |
| 057 | LO P-Coolant | Check coolant circuit. |
| 058 | SS P-Coolant | Automatic shutdown. Check coolant level. |
| 063 | HI P-Crankcase | Reduce power. Replace oil separator element. |
| 064 | SS P-Crankcase | Replace oil separator element. Contact Service. |
| 065 | LO P-Fuel | Check fuel lines for leaks. Clean and flush fuel prefilter. Replace filter element of fuel prefilter. |
| 066 | SS P-Fuel | Check fuel lines for leaks. Clean and flush fuel prefilter. Replace filter element of fuel prefilter. |
| 067 | HI T-Coolant | Reduce power. |
| 068 | SS T-Coolant | Allow engine to cool down. Check coolant cooler, clean if necessary. Restart engine. Contact Service. |
| 087 | AL Rail Leakage | Contact Service. |
| 082 | 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. |
| 083 | 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. |
| 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. |
| 090 | SS No Idling Speed | Contact Service. |
| 091 | SS No Runup Speed | Contact Service. |
| 092 | SS No Starter Speed | Contact Service. |
| 093 | SS T-Preheat | Check preheater. |
| 094 | LO T-Preheat | Check preheater. |
| 095 | AL Prelubrication Fault | Check oil priming system. |
| 102 | Consumption Meter Faulty | Contact Service. |
| 104 | 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. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.