P2128
PowertrainElectronic Throttlecritical severityThrottle/Pedal Position Sensor/Switch E Circuit High
What P2128 Means
High voltage from accelerator pedal position sensor E.
Symptoms
- Limp mode
- Check engine light
- Possible unintended throttle input
Common Causes
- Open ground
- Short to voltage in harness
- Failed sensor
Diagnostic Steps
- Measure sensor E voltage
- Check ground circuit
- Inspect wiring
Where to start: Replace accelerator pedal assembly or repair wiring.
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