BMW DTC P120E – Brake Booster Pump Control Circuit High
DTC P120E meaning on BMW
DTC P120E on a BMW refers to a fault in the Brake Booster Pump Control Circuit where the control module has detected a high voltage condition. This indicates a potential issue with the brake booster pump control system.
BMW DTC P120E symptoms
Symptoms of DTC P120E on a BMW may include:
- Check Engine Light illuminated
- ABS warning light on
- Brake system warning messages
- Decreased brake performance
BMW DTC P120E causes
Possible causes of DTC P120E on a BMW include:
- Faulty brake booster pump
- Wiring or connector issues in the brake booster pump circuit
- Defective brake booster pump control module
BMW DTC P120E seriousness
DTC P120E should be addressed promptly as it can affect the proper functioning of the brake booster pump system, potentially leading to decreased brake performance and safety risks.
How to diagnose DTC P120E on BMW
To diagnose DTC P120E on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the brake booster pump and related components for any visible damage or signs of wear
- Check the wiring and connectors in the brake booster pump control circuit for continuity and proper connections
- Test the brake booster pump control module for proper functionality
How to fix DTC P120E on BMW
To fix DTC P120E on a BMW, the following steps may be taken:
- Replace the faulty brake booster pump if necessary
- Repair or replace any damaged wiring or connectors in the brake booster pump circuit
- Replace the defective brake booster pump control module
- Clear the fault code and perform a test drive to ensure the issue has been resolved
How to erase DTC P120E on BMW
To erase DTC P120E on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s memory. After the repair has been completed, the mechanic can perform this step to reset the system and ensure the fault code does not reappear.
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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