BMW DTC C055E – Brake Hydraulic Circuit ‘A’ Leak
DTC C055E meaning on BMW
DTC C055E on a BMW indicates a Brake Hydraulic Circuit ‘A’ Leak. This fault code is triggered when the vehicle’s onboard diagnostic system detects a leak in the hydraulic circuit of the braking system.
BMW DTC C055E symptoms
Symptoms of DTC C055E on a BMW may include:
- Brake fluid leakage under the vehicle
- Soft or spongy brake pedal feel
- Illumination of the brake warning light on the dashboard
- Reduced braking performance
BMW DTC C055E causes
The common causes of DTC C055E on a BMW are:
- Worn or damaged brake lines
- Loose fittings or connections in the brake hydraulic system
- Corrosion or rust on brake components
- Defective brake master cylinder
BMW DTC C055E seriousness
DTC C055E 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 fault code to ensure the proper functioning of the braking system.
How to diagnose DTC C055E on BMW
To diagnose DTC C055E on a BMW, you can perform the following steps:
- Visually inspect the brake lines and connections for any signs of leakage.
- Check the brake fluid level and quality.
- Use a brake pressure tester to identify the location of the leak in the hydraulic circuit.
- Scan the vehicle’s onboard diagnostic system for additional fault codes related to the braking system.
How to fix DTC C055E on BMW
To fix DTC C055E on a BMW, you may need to:
- Repair or replace any damaged brake lines or components.
- Tighten loose fittings or connections in the brake hydraulic system.
- Flush and refill the brake fluid to the correct level.
- Replace the brake master cylinder if necessary.
How to erase DTC C055E on BMW
To erase DTC C055E on a BMW, you can:
- Use an OBD-II scanner to clear the fault code from the vehicle’s memory.
- After fixing the underlying issue causing the fault code, drive the vehicle to allow the system to retest and verify the repair.
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
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