Cummins ISB CM850 (2003-06) Fault Code: 412 PID: SID 250 SPN: 608 FMI: 2 SAE J1587/J1922 data link – can not transmit. Communication between the ECM and another device on the J1587/J1922 data link has been lost.

Posted by PerDiezel Solutions on January 18, 2026

This fault occurs whenever the ECM starts communicating with any other device with the J1587/J1922 data link and then can no longer transmit on the data link. Possible causes could be the following: Unplugthe electronic service tool before keying off the ECM, the J1587/J1922 data link having an intermittent electrical problem, and the ECM (or another J1587/J1922 device) tying up communications because of an electrical problem or by sending too many messages without stopping.

Possible repairs:

1)Repair the damaged harness, connectors, or pins if possible.

Cummins ISB CM850 (2003-06) Fault Code: 387 PID: SID 221 SPN: 1043 FMI: 3 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply circuit for the accelerator pedal or lever position sensor.

Cummins ISB CM850 (2003-06) Fault Code: 386 PID: SID 212 SPN: 1079 FMI: 3 Sensor Supply Voltage number 1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 1 circuit.

Cummins ISB CM850 (2003-06) Fault Code: 352 PID: SID 212 SPN: 1079 FMI: 4 Sensor Supply Voltage Number 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 1 circuit.

Cummins ISB CM850 (2003-06) Fault Code: 351 PID: SID 254 SPN: 627 FMI: 12 Injector Power Supply – Bad Intelligent Device or Component. The ECM measured injector boost voltage is low.

Cummins ISB CM850 (2003-06) Fault Code: 343 PID: SID 254 SPN: 629 FMI: 12 Engine Control Module Warning Internal Hardware Failure – Bad Intelligent Device or Component.

Cummins ISB CM850 (2003-06) Fault Code: 342 PID: SID 253 SPN: 630 FMI: 13 Electronic Calibration Code Incompatibility – Out of Calibration. An incompatable calibration between the primary and secondary OEM installed ECM’s has been detected.

WARNING!