Cummins ISB CM850 (2003-06) Fault Code: 2357 PID: SID 146 SPN: 2791 FMI: 7 Exhaust Gas Recirculation (EGR) Valve Control – Mechanical System Not Responding Properly or Out of Adjustment. EGR valve motor does not respond or is slow to respond.

Posted by PerDiezel Solutions on January 18, 2026

The ECM monitors the duty cycle of the valve and logs a fault code if the duty cycle is too high. This fault is always set inactive when the keyswitch is turned ON. If there is a failure, the fault code will not be set active until the valve has been actuated. For these reasons, this troubleshooting tree must be used for both active and inactive fault codes. This also means the only sufficient way to make sure the repair is effective, is to run the INSITE? EGR Valve Test. Running the engine may not be enough to verify the repair was effective.

Possible causes:

1)Failed EGR valve position sensor; mechanical or electrical failure
2)EGR valve assembly failure requiring a high current to operate the valve, such as a stuck or sticking valve.

Possible repairs:

1)Repair or replace the engine harness
2)Replace the ECM.
3)Replace the EGR valve assembly.

Cummins ISB CM850 (2003-06) Fault Code: 2353 PID: SID 146 SPN: 2971 FMI: 6 Exhaust Gas Recirculation (EGR) valve control circuit – current above normal or grounded circuit. Excess current detected at the EGR valve motor output circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2352 PID: SID 146 SPN: 2791 FMI: 3 EGR Valve Control Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the EGR valve motor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2351 PID: SID 146 SPN: 2791 FMI: 4 EGR Valve Control Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the EGR valve motor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2349 PID: SID 146 SPN: 2791 FMI: 5 EGR Valve Control Circuit – Current Below Normal or Open Circuit. High voltage or open circuit detected at the EGR valve motor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2348 PID: 27 SPN: 27 FMI: 13 EGR valve failed automatic calibration procedure – out of calibration.

Cummins ISB CM850 (2003-06) Fault Code: 2347 (ISC) PID: SPN: 2790 FMI: 15 Turbocharger Compressor Outlet Air Temperature (Calculated) – Data Valid but Above Normal Range – least severe level.

WARNING!