Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that the car's computer is not getting enough power from the sensor that tells it how hard you're pressing the brake pedal.
The brake pedal position sensor monitors how much the brake pedal is being pressed and sends this information to the car's computer. This code indicates that the voltage from this sensor is lower than expected.
The C056D code is triggered when the brake pedal position sensor supply voltage drops below a specified threshold. This could be due to a wiring issue, a faulty sensor, or a problem with the vehicle's electrical system.
• Brake lights may not function correctly
• ABS or traction control warning lights may illuminate
• Brake pedal may feel different
• Faulty brake pedal position sensor
• Damaged or corroded wiring/connectors
• Low battery voltage
Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.
Voltage: An electromotive force or potential difference expressed in volts.
• Check the battery voltage and charging system
• Inspect the brake pedal position sensor and its wiring for damage
• Test the sensor's output voltage with a multimeter
• Replace the brake pedal position sensor if faulty
• Repair or replace damaged wiring or connectors
• Ensure battery and charging system are functioning properly
• Multimeter
• OBD-II scanner
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain electrical connections
• Keep battery terminals clean and secure
• Perform routine vehicle diagnostics
Sensor Issue
• Do not ignore warning lights on the dashboard
• Have the vehicle inspected by a professional if unsure
• Ensure regular maintenance checks
Check with your vehicle manufacturer for specific warranty coverage on sensors and electrical components.
This code has been more common in vehicles with older electrical systems or those exposed to harsh environments.
Moderate – While the vehicle may still be drivable, it is important to address this issue to ensure proper brake system function.
Driving with malfunctioning brake components can be dangerous. Ensure repairs are made promptly to maintain vehicle safety.
• Vehicle ignition on
• Brake pedal pressed
The brake pedal position sensor is typically located near the brake pedal assembly, under the dashboard.
Q: Can I drive with a C056D code?
A: It's not recommended to drive for extended periods with this code, as it may affect brake system performance.
Q: How can I reset the C056D code?
A: After addressing the underlying issue, use an OBD-II scanner to clear the code from the vehicle's computer.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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