P2123critical severityPowertrain
Throttle/Pedal Position Sensor/Switch D Circuit High
on 2004 Isuzu Ascender 4.2L I6 · 4WD
What this code means
High voltage from accelerator pedal position sensor D.
Symptoms
- Limp mode
- Unintended acceleration
- Check engine light
Common causes
- Open ground circuit
- Short to voltage
- Failed sensor
Diagnostic steps
- Measure voltage at APP sensor D
- Check for opens in ground
- Inspect wiring
Repair notes
Replace pedal assembly or repair wiring.
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