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P124B – BMW DTC

BMW DTC P124B – Brake Booster Pump Cut-Off, Overvoltage

DTC P124B meaning on BMW

DTC P124B on a BMW indicates a Brake Booster Pump Cut-Off Overvoltage fault. This fault code is triggered when the control module detects that the voltage supplied to the brake booster pump exceeds the specified limit.

BMW DTC P124B symptoms

Symptoms of DTC P124B on a BMW may include:

  • Check Engine Light (CEL) illuminated on the dashboard
  • Reduced braking performance
  • Increased effort required to depress the brake pedal

BMW DTC P124B causes

The common causes of DTC P124B on a BMW are:

  • Faulty brake booster pump
  • Overvoltage in the brake booster pump circuit
  • Wiring or connection issues in the brake booster pump system

BMW DTC P124B seriousness

DTC P124B should be addressed promptly as it can affect the braking performance of the vehicle. Driving with this fault unresolved may compromise safety and lead to potential brake system failures.

How to diagnose DTC P124B on BMW

To diagnose DTC P124B on a BMW, follow these steps:

  1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
  2. Inspect the brake booster pump for any visible damage or leaks
  3. Check the voltage supply to the brake booster pump using a multimeter
  4. Inspect the wiring and connections in the brake booster pump circuit for any signs of damage or corrosion

How to fix DTC P124B on BMW

To fix DTC P124B on a BMW, you can:

  1. Replace the faulty brake booster pump
  2. Repair any wiring or connection issues in the brake booster pump circuit
  3. Reset the fault code using a diagnostic scanner after the repair

How to erase DTC P124B on BMW

To erase DTC P124B on a BMW, follow these steps:

  1. Use a diagnostic scanner to clear the fault code
  2. Ensure that the repair has been completed successfully
  3. Perform a test drive to confirm that 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

← All BMW Diagnostic Trouble Codes

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