BMW DTC C055D – Brake Hydraulic Circuit ‘B’ Leak
DTC C055D meaning on BMW
DTC C055D on a BMW refers to a Brake Hydraulic Circuit ‘B’ Leak. This diagnostic trouble code indicates that there is a leak detected in the hydraulic circuit ‘B’ of the braking system.
BMW DTC C055D symptoms
Symptoms of DTC C055D on a BMW may include:
- Brake fluid leakage under the vehicle
- Low brake fluid level warning light on the dashboard
- Soft or spongy brake pedal feel
- Reduced braking performance
BMW DTC C055D causes
The common causes of DTC C055D on a BMW include:
- Leaking brake caliper or wheel cylinder
- Cracked or damaged brake line
- Defective brake master cylinder
- Worn or damaged brake hoses
BMW DTC C055D seriousness
DTC C055D is a serious issue that should be addressed promptly. A brake hydraulic circuit leak can compromise the vehicle’s braking performance, leading to potential safety hazards. It is crucial to address this issue to ensure the proper functioning of the braking system.
How to diagnose DTC C055D on BMW
To diagnose DTC C055D on a BMW, you can perform the following steps:
- Visually inspect the brake system components for any signs of leakage.
- Check the brake fluid level and quality.
- Use a brake system pressure tester to identify the location of the leak.
- Scan the vehicle’s onboard diagnostic system for fault codes.
How to fix DTC C055D on BMW
To fix DTC C055D on a BMW, you may need to:
- Identify and repair the source of the brake hydraulic circuit leak.
- Replace any damaged brake components such as calipers, wheel cylinders, brake lines, or hoses.
- Flush and refill the brake fluid to the correct level.
- Perform a thorough brake system inspection and test to ensure proper functionality.
How to erase DTC C055D on BMW
To erase DTC C055D on a BMW, you can:
- Use an OBD-II scanner to clear the fault code from the vehicle’s computer.
- After fixing the underlying issue causing the DTC, drive the vehicle to allow the system to retest and verify the repair.
- If the repair is successful, the DTC should be automatically erased from the system.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.