Cummins ISB CM850 (2003-06) Fault Code: 237 PID: SID 30 SPN: 644 FMI: 2 External Speed Command Input (Multiple Unit Synchronization) – Data Erratic, Intermittent, or Incorrect. The throttle input signal to the primary or secondary engine for multiple unit synchronization is less than 3 percent or more than 97 percent.

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  Cummins ISB4.5 CM2150 Fault Code: 2182 PID: 478 SPN: 1072 FMI: 3 Engine Brake Actuator Driver 1 Circuit – Voltage Above Normal or Shorted to High Source.

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  Cummins ISB4.5 CM2150 Fault Code: 2371 PID: SPN: 1074 FMI: 3 Engine (Exhaust) Brake Driver Circuit – Voltage Above Normal or Shorted to High Source.

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  Cummins ISB4.5 CM2150 Fault Code: 778 PID: SPN: 723 FMI: 2 Engine Camshaft Speed/Position Sensor – Data Erratic, Intermittent, or Incorrect.

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