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 is not getting enough power from the wires that connect to the sensors on the wheels. These sensors help the car know how fast each wheel is going.
The C05A4 code indicates that the electrical circuit providing power to the wheel speed sensors is experiencing low voltage, which can affect the sensors' ability to send accurate speed data to the vehicle's control systems.
The wheel speed sensors are crucial for systems like ABS (Anti-lock Braking System) and traction control. They require a stable voltage supply to function correctly. A low supply circuit could be due to wiring issues, a faulty sensor, or a problem with the vehicle's power distribution system.
• ABS warning light on
• Traction control warning light on
• Inconsistent speedometer readings
• Faulty wheel speed sensor
• Damaged or corroded wiring/connectors
• Faulty ABS control module
ABS: Anti-lock Braking System, a safety system that prevents the wheels from locking up during braking.
Traction Control: A system that helps prevent wheel spin during acceleration.
• Check for any blown fuses related to the ABS system.
• Inspect the wiring and connectors for damage or corrosion.
• Test the voltage supply to the wheel speed sensors.
• Replace any damaged wiring or connectors.
• Replace the faulty wheel speed sensor.
• Repair or replace the ABS control module if necessary.
• Multimeter
• OBD-II scanner
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Malibu
• Ford F-150
• Toyota Camry
• Regularly inspect and maintain the vehicle's wiring and connectors.
• Ensure the vehicle's electrical system is in good condition.
• Avoid driving through deep water which can damage electrical components.
Sensor Issue
• Do not ignore ABS or traction control warning lights.
• Have the vehicle inspected by a professional if this code appears.
Check with the vehicle manufacturer for warranty coverage on ABS components.
This code has been reported more frequently in vehicles with high mileage or those exposed to harsh environmental conditions.
Moderate – While the vehicle may still be drivable, the ABS and traction control systems may not function properly, potentially affecting safety.
Driving with a malfunctioning ABS system can increase stopping distances and affect vehicle handling in emergency situations.
• Vehicle parked on a level surface
• Ignition in the 'on' position
The wheel speed sensors are located near each wheel, typically mounted on the wheel hub or axle.
Q: Can I drive with this code?
A: It's possible to drive, but it's not recommended as safety systems like ABS may not work properly.
Q: How do I reset the ABS light?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.