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 is a leak in the part of the car that helps the brakes work. It's like a balloon with a hole in it, so it can't hold air properly.
The vehicle's computer has detected a leak in the hydraulic system of the brakes, which can affect braking performance.
The C055E code indicates that the Electronic Brake Control Module (EBCM) has detected a loss of pressure in the brake hydraulic circuit 'A'. This could be due to a leak in the brake lines, hoses, calipers, or master cylinder, leading to reduced braking efficiency.
• Reduced braking performance
• Brake warning light on the dashboard
• Spongy or soft brake pedal
• Damaged brake lines or hoses
• Faulty brake caliper seals
• Leaking master cylinder
Brake Hydraulic Circuit: The system that uses brake fluid to transfer force from the brake pedal to the brake pads.
EBCM: Electronic Brake Control Module, which manages the brake system's electronic functions.
• Inspect brake lines and hoses for visible leaks.
• Check the brake calipers and master cylinder for signs of fluid leakage.
• Perform a pressure test on the brake system.
• Replace damaged brake lines or hoses.
• Repair or replace faulty brake calipers.
• Replace the master cylinder if it is leaking.
• Brake line wrench
• Pressure tester
• Brake fluid
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect brake lines and hoses for wear.
• Replace brake fluid as per manufacturer recommendations.
• Check brake components during routine maintenance.
Brake System Issue
• Do not drive the vehicle until the brake system is inspected and repaired.
• Have a professional mechanic check the brake system if you notice any symptoms.
Check with your vehicle manufacturer for specific warranty coverage on brake components.
This code has been reported in vehicles with aging brake components or those exposed to harsh environmental conditions.
High – A brake system leak can severely impact vehicle safety and should be addressed immediately.
Driving with a compromised brake system is dangerous and may violate traffic safety laws.
• Vehicle parked on a level surface
• Engine off and brake pedal pressed
The brake hydraulic circuit is located throughout the vehicle, including the brake lines, hoses, calipers, and master cylinder.
Q: Can I drive with a C055E code?
A: No, driving with a brake system leak can be very dangerous. It should be repaired immediately.
Q: How do I know if my brakes are leaking?
A: Look for brake fluid on the ground under your vehicle or a spongy brake pedal feel.
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.