Brake Pedal Position Sensor Supply Voltage Circuit Low

Where it lives

For C056D, the circuit described runs through the sensor. The description of C056D reports a fault at the sensor.

Check these first

• A short to ground in the brake pedal position sensor supply wire
• A failed brake pedal position sensor pulling the supply down
• A chafed harness shorting the sensor supply to ground
• Corrosion in the sensor connector causing a partial short
• A control module reference supply fault

What to do next

1. Disconnect the brake pedal position sensor and check the supply voltage
2. Test the sensor supply wire for a short to ground
3. Inspect the sensor harness and connector for chafing or corrosion
4. Check the sensor signal on live data with a scan tool
5. Replace the brake pedal position sensor if it loads the supply down
6. Clear the code and retest

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