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PACCAR PX-6 CM2150 (2007-09) Fault Code: 2557 PID: SID 057 SPN: 697 FMI: 3 Auxiliary PWM Driver 1 – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the analog torque circuit.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

Possible causes:

1)A faulty transmission shift modulator
2)An open circuit in the output device driver return wire
3)A pin-to-pin short circuit in the output device driver wire.

Possible repairs:

1)Replace the transmission shift modulator.
2)Repair or replace the OEM harness.
3)Replace the ECM.

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