BMW DTC P12BC – Brake Booster Pump Output Stage Defective
DTC P12BC meaning on BMW
DTC P12BC on a BMW refers to a fault with the Brake Booster Pump Output Stage. This diagnostic trouble code indicates that there is an issue with the output stage of the brake booster pump, which is responsible for assisting the brake system in generating the necessary braking force.
BMW DTC P12BC symptoms
Symptoms of DTC P12BC on a BMW may include:
- Brake pedal feeling spongy or hard
- ABS warning light illuminated on the dashboard
- Decreased braking performance
BMW DTC P12BC causes
Common causes of DTC P12BC on a BMW include:
- Faulty brake booster pump
- Electrical issues in the brake booster pump circuit
- Wiring harness problems
BMW DTC P12BC seriousness
DTC P12BC should be taken seriously as it can affect the braking performance of the vehicle. Driving with a faulty brake booster pump output stage can compromise safety and should be addressed promptly.
How to diagnose DTC P12BC on BMW
To diagnose DTC P12BC on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the brake booster pump and associated components for any visible damage
- Check the wiring and connectors for any signs of corrosion or disconnection
How to fix DTC P12BC on BMW
To fix DTC P12BC on a BMW, the following steps may be taken:
- Replace the faulty brake booster pump
- Repair any damaged wiring or connectors in the brake booster pump circuit
- Clear the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC P12BC on BMW
To erase DTC P12BC on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the vehicle’s computer system. Once the issue has been fixed and the fault codes cleared, the ABS warning light should no longer be illuminated.
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.