BMW DTC C0591 – Brake Booster Motor ‘A’ Phase U-V-W Current Low
DTC C0591 meaning on BMW
DTC C0591 on a BMW refers to the Brake Booster Motor ‘A’ Phase U-V-W Current Low fault. This diagnostic trouble code indicates that the current flowing through the phases U, V, and W of the brake booster motor is lower than the expected value.
BMW DTC C0591 symptoms
Symptoms of DTC C0591 on a BMW may include:
- Illuminated ABS warning light on the dashboard
- Decreased brake assist functionality
- Unusual noises coming from the brake booster motor
BMW DTC C0591 causes
Common causes of DTC C0591 on a BMW include:
- Faulty brake booster motor
- Wiring or connection issues in the brake booster motor circuit
- Electronic control unit (ECU) malfunction
BMW DTC C0591 seriousness
The seriousness of DTC C0591 on a BMW depends on the extent of the issue. While the vehicle may still be operable with this fault, it is important to address it promptly to ensure proper brake functionality and safety.
How to diagnose DTC C0591 on BMW
To diagnose DTC C0591 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scan tool to retrieve the fault codes
- Inspect the brake booster motor and its connections for any visible damage
- Test the current flow through the phases U, V, and W of the brake booster motor
How to fix DTC C0591 on BMW
To fix DTC C0591 on a BMW, the following steps may be taken:
- Replace the faulty brake booster motor
- Repair any damaged wiring or connections in the brake booster motor circuit
- Reset the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC C0591 on BMW
To erase DTC C0591 on a BMW, the fault codes can be cleared using a diagnostic scan tool. After addressing the underlying issue causing the fault code, clearing the codes will reset the system and turn off the warning light on the dashboard.
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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