Cummins ISX CM870 (2003-06) Fault Code: 133 PID: P029 SPN: 974 FMI: 3/3 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at remote accelerator position signal circuit.

Possible causes:

1)Remote accelerator pedal or lever position signal circuit shorted to battery or (+) 5 volt supply
2)Open remote accelerator pedal or lever return circuit in the harness or connections
3)Remote accelerator supply shorted to battery
4)Malfunctioned remote accelerator pedal or lever position sensor.
NOTE: The three wires in the remote accelerator position sensor circuit must be twisted together

Possible repair:

1)Repair the damaged harness, connector, or pins, if possible.
2)Repair or replace the OEM wiring harness.