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 car's computer has detected a problem with the power supply to the pump that helps the brakes work better. It's like if your toy's battery isn't working right, so the toy can't move as it should.
The ABS (Anti-lock Braking System) pump motor requires a stable power supply to function correctly. This code indicates a problem with the voltage supply to the pump motor, which may be due to an open circuit or a faulty connection.
C05A5 is a chassis code indicating an issue with the electrical circuit that supplies voltage to the ABS pump motor. This could be due to a break in the wiring, a poor connection, or a failure in the power source, preventing the pump motor from receiving the necessary voltage to operate.
• ABS warning light illuminated on the dashboard
• Reduced braking performance
• ABS system not functioning
• Faulty wiring or connectors in the ABS pump motor circuit
• Blown fuse related to the ABS system
• Defective ABS pump motor relay
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Check the ABS fuse and replace if blown.
• Inspect wiring and connectors for damage or corrosion.
• Test the ABS pump motor relay for proper operation.
• Replace damaged wiring or connectors.
• Replace the ABS fuse if necessary.
• Replace the ABS pump motor relay if it is faulty.
• Multimeter
• OBD-II scanner
• Basic hand tools
$100 to $300
Moderate
• Chevrolet Malibu
• Ford Focus
• Toyota Camry
• Regularly inspect ABS system wiring for damage.
• Ensure all electrical connections are secure and free of corrosion.
• Have the ABS system checked during routine maintenance.
Chassis Electrical Issue
• Do not ignore the ABS warning light; have the system checked promptly.
• Drive cautiously if the ABS system is not functioning.
• Consult a professional mechanic for accurate diagnosis and repair.
ABS components may be covered under manufacturer warranty; check with your dealer.
This code has been commonly reported in vehicles with aging electrical systems or those exposed to harsh weather conditions.
Moderate – It is important to address this issue to ensure proper braking performance.
Driving with a malfunctioning ABS system can increase the risk of accidents, especially in slippery conditions.
• Vehicle stationary with ignition on.
• ABS system self-test during initial start-up.
The ABS pump motor is typically located near the vehicle's brake master cylinder or within the ABS module assembly.
Q: Can I drive with the C05A5 code?
A: While you can drive, it's not recommended because the ABS system may not function properly, affecting braking safety.
Q: How do I reset the ABS light?
A: Fix the underlying issue first. Once repaired, the ABS light can be reset using an OBD-II scanner.
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.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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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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