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Auxiliary PWM Driver 1 – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2557 PID: S057 SPN: 697 FMI: 3 LAMP: Amber SRT: |
Auxiliary PWM Driver 1 – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the analog torque circuit. |
Can not control transmission. |
 Auxiliary Pulse Width Modulated (PWM) Driver 1 Circuit
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Circuit Description
The transmission shift modulator uses this signal from the electronic control module (ECM) to determine when to shift the transmission. The return circuit is dependent on original equipment manufacturer (OEM) wiring. It may be wired back to the ECM on some vehicles or wired to chassis or block ground on others. Consult the OEM wiring diagram for return circuit details.
Component Location
Refer to the OEM wiring diagram for the location of the transmission shift modulator.
Shop Talk
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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
This fault can be caused by the following:
- A faulty transmission shift modulator
- An open circuit in the output device driver return wire
- A pin-to-pin short circuit in the output device driver wire.
Refer to Troubleshooting Fault Code t05-2557
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