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Cummins ISX CM870 (2003-06) Fault Code: 597 PID: P167 SPN: 167 FMI: 1/18 Electrical Charging System Voltage – Data Valid But Below Normal Operating Range – Moderately Severe Level. Low battery voltage detected by the battery voltage monitor feature.

Make sure the ECM unswitched battery supply is coming directly from the battery and not the starter.

Possible causes:

1)Undercharged batteries caused by a malfunctioning alternator or regulator.2)High-current devices on the vehicle such as citizens band radio amplifiers, numerous exterior lights, or other accessories.

Possible repairs:

1)Charge or replace the battery.2)Repair or replace the alternator and/or OEM wiring to the alternator.3)Repair or replace the battery harness.4)Repair or replace the OEM power harness.

Cummins ISX CM870 (2003-06) Fault Code: 596 PID: P167 SPN: 167 FMI: 0/16 Electrical Charging System Voltage – Data Valid But Above Normal Operating Range – Moderately Severe Level. High battery voltage detected by the battery voltage monitor feature.
Cummins ISX CM870 (2003-06) Fault Code: 595 PID: P103 SPN: 103 FMI: 0/16 Turbocharger 1 Speed – Data Valid But Above Normal Operating Range – Moderately Severe Level. High turbocharger speed has been detected by the engine control module (ECM).
Cummins ISX CM870 (2003-06) Fault Code: 585 PID: S39 SPN: 677 FMI: 4/4 Starter Relay Driver Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at starter lockout circuit.
Cummins ISX CM870 (2003-06) Fault Code: 584 PID: S39 SPN: 677 FMI: 3/3 Starter Relay Driver Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at starter lockout circuit.
Cummins ISX CM870 (2003-06) Fault Code: 559 PID: P157 SPN: 157 FMI: 1/18 Injector Metering Rail 1 Pressure – Data Valid But Below Normal Operating Range – Moderately Severe Level. The engine control module (ECM) has detected that fuel pressure is lower than commanded pressure.
Cummins ISX CM870 (2003-06) Fault Code: 551 (SSS) PID: S230 SPN: 558 FMI: 4/4 Accelerator Pedal Idle Validation Circuit – data incorrect. No voltage detected simultaneously on both idle validation and off-idle validation switches.