P2138
PowertrainElectronic Throttlecritical severityThrottle/Pedal Position Sensor/Switch D/E Voltage Correlation
What P2138 Means
The dual accelerator pedal position sensors report conflicting values.
Symptoms
- Limp mode
- No throttle response
- Check engine light
- Engine at idle only
Common Causes
- Failed APP sensor
- Corroded pedal connector
- Wiring fault
- 5V reference issue
Diagnostic Steps
- Check APP sensor D and E voltages
- Verify 5V reference
- Inspect pedal connector
Where to start: Replace accelerator pedal assembly. Check shared 5V reference circuit.
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