C056D
Brake Pedal Position Sensor Supply Voltage Circuit Low
Brake pedal position sensor supply voltage below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Brake pedal position sensor supply voltage below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Common causes
- high
Supply wire shorted to ground
One of the most commonly reported causes for this code — check this first.
Typical part cost: $60-440
- low
Connector pins corroded - high contact resistance
Less common, but worth ruling out after the more likely causes.
Typical part cost: $60-440
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for C056D.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for C056D.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for C056D.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does C056D mean?
C056D means "Brake Pedal Position Sensor Supply Voltage Circuit Low". It is a generic OBD-II code that points to a fault in the chassis.
What are the most common causes of C056D?
supply wire shorted to ground; connector pins corroded - high contact resistance; harness chafing through insulation — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full C056D diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.