Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the electric motor that helps you brake. It's like when a toy's battery is too strong and makes it act funny.
The code indicates that the voltage in the circuit controlling the brake booster motor is higher than expected.
OBD-II code C0581 is triggered when the powertrain control module (PCM) detects an unusually high voltage condition in the U-V-W phase circuit of the brake booster motor. This motor is part of the system that assists in applying the brakes, making it easier to stop the vehicle. A high voltage condition may indicate a short circuit or a fault in the motor or its control circuitry.
• Increased effort needed to brake
• Brake warning light on the dashboard
• Unusual noises when braking
• Faulty brake booster motor
• Short circuit in the wiring
• Malfunctioning control module
Brake Booster: A device that helps reduce the effort needed to apply the vehicle's brakes.
PCM: Powertrain Control Module, the computer that controls the engine and transmission.
• Use a diagnostic scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the brake booster motor for proper operation.
• Repair or replace damaged wiring.
• Replace the brake booster motor if faulty.
• Replace or reprogram the control module if necessary.
• Diagnostic scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect brake system components.
• Ensure all electrical connections are secure.
• Perform routine maintenance checks.
Brake System Issue
• Do not ignore the brake warning light.
• Have the vehicle inspected by a professional.
• Avoid driving the vehicle until the issue is resolved.
Repairs may be covered under the vehicle's powertrain or brake system warranty.
This code has been associated with electrical issues in brake booster systems, particularly in vehicles with electric brake assist.
High – Brake system issues can affect vehicle safety and should be addressed immediately.
Driving with a malfunctioning brake system can be dangerous. Ensure repairs are performed by a qualified technician.
• Vehicle parked on a level surface
• Engine running
The brake booster motor is typically located near the brake pedal assembly or integrated into the brake system under the hood.
Q: Can I drive with code C0581?
A: It's not safe to drive with this code as it affects the braking system. Have it checked immediately.
Q: How do I reset the C0581 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, the code will reappear.
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Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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