BMW DTC P123F – Brake Booster Pump Fuse Defective
DTC P123F meaning on BMW
DTC P123F is a diagnostic trouble code that indicates an issue with the brake booster pump fuse on BMW vehicles. The brake booster pump is responsible for providing additional braking assistance, especially during emergency braking situations. When this code is triggered, it means that there is a problem with the fuse that supplies power to the brake booster pump.
BMW DTC P123F symptoms
Some common symptoms associated with DTC P123F on BMW vehicles include:
- Brake system warning light illuminated on the dashboard
- Loss of power assistance during braking
- Hard brake pedal feel
BMW DTC P123F causes
The most common causes of DTC P123F on BMW vehicles include:
- Blown brake booster pump fuse
- Short circuit in the wiring supplying power to the brake booster pump
- Faulty brake booster pump
BMW DTC P123F seriousness
DTC P123F should be addressed promptly as it can affect the braking performance of the vehicle. Driving with a faulty brake booster pump fuse can compromise the safety of the vehicle and its occupants.
How to diagnose DTC P123F on BMW
To diagnose DTC P123F on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
- Inspect the brake booster pump fuse for any signs of damage or being blown
- Check the wiring harness for any visible signs of damage or short circuits
- Test the brake booster pump for proper operation
How to fix DTC P123F on BMW
To fix DTC P123F on a BMW, the following steps may be taken:
- Replace the faulty brake booster pump fuse with a new one
- Repair any damaged wiring in the circuit supplying power to the brake booster pump
- If the brake booster pump is faulty, replace it with a new one
How to erase DTC P123F on BMW
After fixing the issue causing DTC P123F on a BMW, the fault codes can be cleared using a diagnostic scanner. This will erase the code from the vehicle’s computer memory and reset the system. It is important to ensure that the repair has been successful before clearing the fault codes.
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.