Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation

Where it lives

For P2139, start at the sensor the description names.

Check these first

• A difference between the throttle position sensor D and F signal voltages
• Damaged or corroded wiring in the sensor D or F circuit
• A short or open in the sensor D or F circuit
• A worn throttle position sensor or accelerator pedal position sensor
• A failed ECM or a calibration fault

What to do next

1. Read the sensor D and F voltages on a scan tool
2. Sweep the pedal and watch for the D and F signals to match
3. Test the D and F circuit wiring for open and short faults
4. Inspect the sensor and pedal assembly connectors for corrosion
5. Replace the throttle or pedal position sensor if the signals diverge
6. Clear the code and retest

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