P2138critical severityPowertrain
Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation
on 2010 Subaru Legacy 2.5L H4 · AWD
What this code 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
Repair notes
Replace accelerator pedal assembly. Check shared 5V reference circuit.
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