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 electric motor that helps the brakes work. It's like the motor isn't getting enough power to do its job properly.
The code C0593 indicates an issue with the brake booster motor's electrical current. The motor is not receiving the expected amount of current in one of its phases, which can affect braking performance.
The brake booster motor is part of the vehicle's braking system that uses electric power to assist with braking. The motor operates in three phases (U, V, W). This code is triggered when the current in the B phase is lower than expected, which can be due to electrical issues such as poor connections, faulty wiring, or a failing motor.
• Increased braking effort required
• Brake warning light on the dashboard
• Unusual noises from the brake system
• Faulty brake booster motor
• Poor electrical connections
• Damaged wiring harness
Brake Booster: A device that uses vacuum or electric power to assist in braking.
Phase: Refers to the electrical phases in a motor, typically U, V, and W.
• Inspect the brake booster motor for damage.
• Check the wiring and connections to the motor.
• Measure the current in the motor's phases using a multimeter.
• Replace the brake booster motor if faulty.
• Repair or replace damaged wiring.
• Ensure all electrical connections are secure and free of corrosion.
• Multimeter
• Socket set
• Screwdriver set
$200 - $600
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect the brake system.
• Ensure electrical connections are clean and tight.
• Avoid driving through deep water to prevent electrical damage.
Electrical Issue
• Have your brakes inspected by a professional if you notice any issues.
• Do not ignore the brake warning light on the dashboard.
Check with your vehicle manufacturer as brake system components may be covered under warranty.
This code has been reported in vehicles with electric brake booster systems, particularly in models with electronic braking systems.
High – Braking performance may be compromised, which is a safety concern.
Driving with impaired brakes can lead to accidents. It is important to address this issue promptly.
• Vehicle ignition on
• Brake pedal depressed
The brake booster motor is typically located near the brake pedal or under the hood, attached to the brake master cylinder.
Q: Can I drive with a C0593 code?
A: It's not recommended to drive with this code as it may affect braking performance.
Q: How do I reset the C0593 code?
A: After repairs, the code can be cleared 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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