BMW DTC P123B – Brake Booster Pump Stuck
DTC P123B meaning on BMW
The DTC P123B on a BMW refers to the Brake Booster Pump Stuck fault code. This code indicates that there is an issue with the brake booster pump system in the vehicle.
BMW DTC P123B symptoms
Symptoms of the BMW DTC P123B may include:
- Hard brake pedal feel
- Brake system warning light illuminated on the dashboard
- Loss of power assistance in the brake system
BMW DTC P123B causes
The BMW DTC P123B code can be triggered by various factors, including:
- Brake booster pump failure
- Electrical issues in the brake booster pump system
- Blocked or restricted brake booster pump lines
BMW DTC P123B seriousness
The DTC P123B code should be taken seriously as it affects the proper functioning of the brake system. Driving with a faulty brake booster pump can compromise the vehicle’s braking performance and safety.
How to diagnose DTC P123B on BMW
To diagnose the DTC P123B on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the brake booster pump and related components for any visible damage or leaks
- Test the electrical connections and wiring in the brake booster pump system
How to fix DTC P123B on BMW
Fixing the DTC P123B on a BMW may involve the following steps:
- Replace the faulty brake booster pump
- Clean or replace any blocked or restricted brake booster pump lines
- Repair any damaged electrical connections or wiring in the brake booster pump system
How to erase DTC P123B on BMW
To erase the DTC P123B code on a BMW, a mechanic can use a diagnostic scanner to clear the fault code from the vehicle’s computer system after the underlying issue has been resolved.
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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