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Cummins ISX CM870 (2003-06) Fault Code: 2554 PID: P95 SPN: 1209 FMI: 2/2 Exhaust Gas Pressure – Data Erratic, Intermittent or Incorrect. The exhaust gas pressure sensor is reading an erratic value.
At key-on, before the engine starts, the sensor readings for barometric pressure, engine oil pressure, and intake manifold pressure are compared with exhaust gas pressure. This fault code occurs if the exhaust gas pressure sensor reading is different from any two of the other three. This check is only done once after the keyswitch is turned on and before the engine is started. The engine oil temperature must also be at least 7?C [45?F] for this check to run.
Shop exhaust fans can cause this fault code to come active. Turn exhaust fans off when troubleshooting this fault code.
In some cases, a plugged exhaust gas pressure sensor tube can also cause this fault code.
Possible repairs:
1)Replace the exhaust gas pressure sensor.
Cummins ISX CM870 (2003-06) Fault Code: 2552 PID: P157 SPN: 157 FMI: 0/16 Front Fueling Actuator Pressure High – Warning. Unexpected high fueling detected on the front bank.
Cummins ISX CM870 (2003-06) Fault Code: 2551 PID: P129 SPN: 1349 FMI: 0/16 Rear Fueling Actuator Pressure High – Warning. Unexpected high fueling detected on the rear bank.
Cummins ISX CM870 (2003-06) Fault Code: 2385 PID: S027 SPN: 641 FMI: 3 Variable geometry turbocharger actuator driver circuit – voltage above normal or shorted to high source. Open circuit or high voltage detected at turbocharger control valve circuit.
Cummins ISX CM870 (2003-06) Fault Code: 2384 PID: S027 SPN: 641 FMI: 4 Variable geometry turbocharger actuator driver circuit – voltage below normal or shorted to low source. Low voltage detected at turbocharger control valve circuit.
Cummins ISX CM870 (2003-06) Fault Code: 2377 PID: S33 SPN: 647 FMI: 3/3 Fan Control Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at the fan control circuit.
Cummins ISX CM870 (2003-06) Fault Code: 2376 PID: P412 SPN: 412 FMI: 4/4 Recirculated Exhaust Gas Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at EGR temperature circuit.