P0122high severityPowertrain
Throttle/Pedal Position Sensor/Switch A Circuit Low Input
on 2009 Subaru Legacy 2.5L H4 · AWD
What this code means
The TPS voltage is below the minimum threshold.
Symptoms
- Check Engine Light
- Limp mode
- Engine stuck at idle
- No throttle response
Common causes
- Short to ground in TPS circuit
- Faulty TPS
- Damaged wiring
- Failed reference voltage
Diagnostic steps
- Test TPS voltage
- Check for shorts to ground
- Test 5V reference
- Inspect wiring
Repair notes
Repair short or replace TPS.
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