MTU 12V 2000 M72 troubleshooting: 15 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
MTU 12V 2000 M72 — full specs, parts & maintenance.
| Symptom | Remedy |
|---|---|
| Charge-air temperature sensor B9.1 exceeded the limit value | Check the charge-air cooler coolant discharge and adjust as necessary. |
| Exhaust temperature sensor B4.21 violated the upper limit value | Check individual exhaust gas temperatures and replace the engine oil filter if necessary. |
| Differential oil pressure sensors B5.1 and B5.3 exceeded the upper limit value | Replace the engine oil filter and inspect engine wiring. |
| Lube oil temperature sensor B7.1 exceeded the limit value | Check the operation of the cooler and fan. |
| Fuel pressure sensor B34.1 at the HP fuel system experienced a pressure increase that is too low | Check fuel reserves and supply, as well as replacement of the fuel filter if necessary. |
| Pressure increase in the HP fuel system during engine start is too low | Check for leak-tightness and venting of the fuel system. During engine stop, pressure decrease is also too low. |
| Operating hours calculated by the ECU and stored on stopping the engine cannot be read out properly upon restarting the engine | Contact with Service |
| Temperature inside the ECU sensor exceeded the upper limit value | Disconnect power supply, check power supply, and inspect plug connections for engine governor ECU. |
| CAN bus to plant automation system is disrupted or defective | Observe other messages and contact with Service if necessary. |
| Signal from coolant temperature sensor B6.1 on the coolant distribution housing is faulty or missing | Check engine wiring and contacting Service for assistance. |
| Faulty pressure sensor B48.1, missing oil signal, and short circuit faults in injector wiring for cylinders A2, A7, B4, A1, A6, B3, and B8 | Engine wiring check (Page 160), contact service or replace affected components (Pages 112, 160). |
| Disruption fault in injector wiring to cylinder TO 2, TO 3, TOP 4 | Engine wiring check (Page 160), contact service or replace affected components (Pages 112, 160). |
| Excessive current engine power exceeding 1 | Check engine wiring and plug connections for the engine governor ECU. |
| Open loads detected at digital input 5 of the ECU (404 - AL Open Load Digital Input 5 PV-Number) | Check engine wiring and plug connections for the engine governor ECU. |
| ECU voltage violations (411 - LOLO U-PDU PV-Number) | Check power supply, engine wiring, and plug connections. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.