C055B – BMW DTC

BMW DTC C055B – ABS Pump Motor Supply Voltage ‘A’ Low

DTC C055B meaning on BMW

DTC C055B on a BMW refers to the ABS Pump Motor Supply Voltage ‘A’ Low. This diagnostic trouble code indicates that the voltage supply to the ABS pump motor is below the expected threshold, which can lead to issues with the anti-lock braking system.

BMW DTC C055B symptoms

Symptoms of DTC C055B on a BMW may include:

• ABS warning light illuminated on the dashboard
• ABS system not functioning properly
• Loss of traction control
• Unusual noises coming from the ABS pump motor

BMW DTC C055B causes

The common causes of DTC C055B on a BMW include:

• Faulty ABS pump motor
• Corroded or damaged wiring/connectors in the ABS system
• Low voltage supply to the ABS pump motor
• Issues with the ABS control module

BMW DTC C055B seriousness

DTC C055B is a serious issue as it directly affects the functionality of the ABS system in your BMW. Driving with a malfunctioning ABS system can compromise your vehicle’s ability to maintain traction and stability during braking, especially in emergency situations.

How to diagnose DTC C055B on BMW

To diagnose DTC C055B on your BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes from the ABS system
2. Inspect the wiring and connectors related to the ABS pump motor for any visible damage or corrosion
3. Test the voltage supply to the ABS pump motor to ensure it meets the manufacturer’s specifications
4. If necessary, perform a functional test of the ABS system to identify any specific issues

How to fix DTC C055B on BMW

To fix DTC C055B on your BMW, you may need to:

1. Replace the faulty ABS pump motor with a new one
2. Repair or replace any damaged wiring or connectors in the ABS system
3. Ensure the voltage supply to the ABS pump motor is within the correct range
4. If needed, reprogram or replace the ABS control module

How to erase DTC C055B on BMW

To erase DTC C055B from your BMW’s system, you can:

1. Use a diagnostic scanner to clear the fault codes stored in the ABS system
2. After making the necessary repairs, perform a test drive to ensure the ABS system functions properly
3. If the issue is resolved, the ABS warning light should no longer be illuminated 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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