Accelerator Pedal Position Sensor 2 Circuit Malfunction

What this code means

The PCM has detected a malfunction in the Accelerator Pedal Position Sensor 2 circuit. This redundant sensor provides a backup throttle demand signal for safety. A fault in either APP sensor triggers reduced power mode.

Symptoms

• Check Engine Light
• Reduced power mode activated
• Engine limited to low RPM
• ETC warning light on
• Slow throttle response

Common causes

• Faulty APP sensor 2
• Wiring or connector issue in APP sensor 2 circuit
• Corroded accelerator pedal connector
• Failing accelerator pedal assembly
• Reference voltage issue

Diagnostic steps

1. Monitor APP sensor 2 voltage through full pedal travel
2. Compare APP sensor 2 with APP sensor 1 readings
3. Inspect accelerator pedal connector for corrosion
4. Check reference voltage at APP sensor 2
5. Wiggle test wiring while monitoring

Repair notes

Replace the accelerator pedal assembly if the APP sensor 2 is faulty.

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