P1125high severityPowertrain
Accelerator Pedal Position System
on 2004 Cadillac STS 4.6L V8 · RWD
What this code means
The PCM detected a malfunction in the Accelerator Pedal Position (APP) system. The APP system includes multiple sensors that track driver throttle demand.
Symptoms
- Check Engine Light
- Reduced Engine Power mode
- Loss of throttle response
- Vehicle may not accelerate
- Limp mode
Common causes
- Faulty APP sensor assembly
- Damaged wiring to APP sensor
- Corroded APP connector
- Floor mat interfering with pedal
- APP sensor out of calibration
Diagnostic steps
- Test APP sensor voltages at rest and full pedal
- Inspect APP sensor connector
- Check for floor mat interference
- Monitor APP readings with scan tool
- Compare APP sensor 1 and 2 readings
Repair notes
Replace accelerator pedal position sensor assembly. Check for interference at pedal.
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