PACCAR PX-6 CM2150 (2007-09) Fault Code: 2558 PID: SID 057 SPN: 697 FMI: 4 Auxiliary PWM Driver 1 – Voltage Below Normal or Shorted to Low Source. Low 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 short circuit to ground on the output device driver line
3)A short pin-to-pin in the output device driver line.
Possible repairs:
1)Replace the transmission shift modulator.
2)Repair or replace the OEM harness.
3)Replace the ECM.
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