Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the computer in your car has detected a problem with the electricity going to the pump that helps your car stop safely. It's like when a toy doesn't work because the batteries are too strong.
The ABS (Anti-lock Braking System) pump motor requires a specific voltage to operate correctly. If the voltage is too high, it can cause the ABS system to malfunction.
The C055A code indicates that the ABS control module has detected an excessively high voltage in the supply circuit of the ABS pump motor. This could be due to a fault in the wiring, a defective pump motor, or an issue with the vehicle's charging system.
• ABS warning light illuminated
• Reduced braking performance
• ABS system not functioning
• Unusual noises from the ABS pump
• Inconsistent brake pedal feel
• Faulty ABS pump motor
• Wiring issues such as short circuits or open circuits
• Defective ABS control module
• Overcharging alternator
• Poor ground connections
ABS: Anti-lock Braking System, a safety system that prevents the wheels from locking up during braking.
Voltage: An electrical measurement that indicates the potential difference between two points.
• Check the ABS fuse and relay.
• Inspect the wiring and connectors for damage or corrosion.
• Test the voltage at the ABS pump motor.
• Check the alternator output for overcharging.
• Use a scan tool to verify the ABS control module operation.
• Replace the faulty ABS pump motor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• Repair or replace the alternator if overcharging.
• Ensure all ground connections are secure and clean.
• Digital multimeter
• OBD-II scan tool
• Wiring repair tools
• Basic hand tools
• Alternator tester
$200 - $800
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain the vehicle's electrical system.
• Ensure battery terminals are clean and secure.
• Check for proper alternator function during routine maintenance.
Electrical Circuit Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if the ABS light is on.
• Regularly check the vehicle's electrical system.
Repairs may be covered under the vehicle's powertrain or electrical warranty if applicable.
This code has been associated with vehicles that have experienced electrical system issues, particularly in models with known alternator problems.
Moderate – While the vehicle may still be drivable, the ABS system may not function properly, affecting braking performance.
Driving with a malfunctioning ABS system can increase the risk of accidents, especially in adverse weather conditions.
• Vehicle ignition in the ON position.
• ABS warning light illuminated on the dashboard.
The ABS pump motor is typically located near the brake master cylinder or integrated into the ABS module under the hood.
Q: Can I drive my car with the C055A code?
A: While you can drive the car, it's not recommended as the ABS system may not function properly, affecting your ability to stop safely.
Q: How can I prevent the C055A code from appearing?
A: Regular maintenance of the electrical system and ensuring the alternator is functioning correctly can help prevent this code.
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