MTU 20 V 4000 G23 troubleshooting: 57 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
MTU 20 V 4000 G23 — full specs, parts & maintenance.
| Code | Meaning | Remedy |
|---|---|---|
| 99 | Lube-oil temperature before engine, shutdown | |
| 101 | Lube-oil temperature before engine, shutdown | |
| 401 | Lube oil pressure before engine, shutdown | |
| SEO03 | Nd11 231 | Contact Service. |
| 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 | 1. Reduce power, 2. Check intercooler. |
| 009 | HI T-Coolant Intercooler | Reduce power. |
| 010 | SS T-Coolant Intercooler | Reduce power. |
| 015 | LO P-Lube Oil | |
| 016 | SS P-Lube Oil | 1. Check oil level, top up as necessary (> Page 169). 2. Attempt to restart engine (-» Page 55). |
| 019 | HI T-Exhaust A | 1. Check cabling (— Page 194). 2. Contact Service. |
| 020 | SS T-Exhaust A | 1. Check cabling (— Page 194). 2. Contact Service. |
| 021 | HI T-Exhaust B | 1. Check cabling (— Page 194). 2. Contact Service. |
| 022 | SS T-Exhaust B | 1. Check cabling (> Page 194). 2. Contact Service. |
| 023 | LO Coolant Level | Check coolant level in expansion tank (— Page 176). |
| 025 | HI P-Diff Lube Oil | Replace oil filter (— Page 173). |
| 026 | HI P-Diff Lube Oil | Replace oil filter (— Page 173). |
| 027 | HI Leak Fuel Level | 1. Check fuel system. 2. Contact Service. |
| 029 | HI ETC 2 idle speed | Contact Service. |
| 030 | SS Engine Speed | 1. Acknowledge alarm. 2. Attempt to restart engine. |
| 031 | HI ETC 1 overspeed | 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 | 1. Reduce power. 2. Contact Service. |
| 037 | SS ETC 2 Overspeed | 1. Reduce power. 2. Contact Service. |
| 038 | AL ETC Speed Deviation | 1. Reduce power. 2. Contact Service. |
| 039 | AL ETC 2 Cutin Failure | 1. Reduce power. 2. Contact Service. |
| 044 | LO Coolant Level Intercooler | Check coolant level (— Page 184). |
| 051 | HI T-Lube Oil | Reduce power. |
| 052 | SS T-Lube Oil | 1. Reduce power. 2. Check engine oil level (— Page 169). |
| 057 | LO P-Coolant | Check coolant circuit. |
| 058 | SS P-Coolant | 1. Automatic engine shutdown. 2. Check coolant level (— Page 176). |
| 059 | SS T-Coolant L3 | 1. Allow engine to cool down; 2. Check coolant cooler, clean if necessary; 3. Contact Service. |
| 060 | SS T-Coolant L4 | 1. Allow engine to cool down; 2. Check coolant cooler, clean if necessary; 3. Contact Service. |
| 063 | HI P-Crankcase | 1. Reduce power. 2. Replace oil separator element (— Page 138). |
| 064 | SS P-Crankcase | 1. Replace oil separator element (— Page 138). 2. Contact Service. |
| 065 | LO P-Fuel | Clean fuei prefilter (— Page 154). Flush fuel prefiiter (+ Page 158). Replace filter element of fuel prefilter (> Page 160). Replace fuel filter (=> Page 153). |
| 066 | SS P-Fuel | Clean fuei prefilter (— Page 154). Flush fuel prefiiter (+ Page 158). Replace filter element of fuel prefilter (> Page 160). Replace fuel filter (=> Page 153). |
| 067 | Hi T-Coolant | Reduce power. |
| 068 | SS T-Coolant | 1. Allow engine to cool down; 2. Check coolant cooler, clean if necessary; 3. Restart engine (— Page 59). 4. Contact Service. |
| 081 | AL Rail Leakage | Contact Service. |
| 082 | HI P-Fuel (Common Rail) | Contact Service. |
| 083 | LO P-Fuel (Common Rail) | Contact Service. |
| 085 | HI T-Recirculation | Reduce power. |
| 086 | HI T-Recirculation | Reduce power. |
| 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. |
| 102 | AL Consumption Meter Faulty | Contact Service. |
| 104 | AL Eng Hours Counter Defect | Contact Service. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.