Accelerator Pedal Position System (GM) / Throttle/Pedal Position Sensor Circuit (Ford)
What does P1125 mean?
The P1125 code means the vehicle's onboard diagnostic system has detected: Accelerator Pedal Position System (GM) / Throttle/Pedal Position Sensor Circuit (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Reduced engine power warning message
- Engine limited to low RPM (limp mode)
- Unresponsive or delayed throttle response
- Vehicle may not accelerate past certain speed
Probable Causes (Ranked by Likelihood)
- Faulty accelerator pedal position (APP) sensor Very High
- Damaged wiring to accelerator pedal module High
- Corroded connector at accelerator pedal Moderate
- Floor mat interfering with pedal travel Moderate
- PCM software issue requiring update Low
Step-by-Step Diagnostic Procedure
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Check for floor mats or debris interfering with the accelerator pedal
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Monitor APP sensor voltage with a scan tool -- should smoothly increase with pedal position
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Inspect the wiring and connector at the accelerator pedal module
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Check for loose or corroded connector pins at the pedal assembly
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Check for TSBs or software updates related to APP sensor issues
Frequently Asked Questions
Can I drive with code P1125?
You can drive short distances, but the vehicle may be in reduced power mode with limited acceleration. This is a safety concern when merging onto highways. Have it repaired promptly.
What causes P1125?
A faulty accelerator pedal position sensor is the most common cause on GM vehicles. The sensor is built into the pedal assembly and cannot be replaced separately on most models.
Is P1125 expensive to fix?
The accelerator pedal assembly typically costs $100 to $300 for the part. Including labor, total repair costs range from $150 to $500. Always check for simple issues like floor mat interference first.