- BMW ABS pump stays on
- BMW ABS motor constantly running
- Battery drains, dead.
- Car won't start without a jump.
The two most common issues that cause the BMW ABS pump to constantly run, including:
- ABS Hydraulic Unit Failure
- Faulty ABS pump relay
Units often affected are Bosch 5.3, Bosch 5.4, and Bosch 5.7 ABS modules installed on several BMW cars, including 3-series, 5-series, 7-series, X3, X5, etc.
If you are on a long road trip and are experiencing this problem, remove the ABS fuse so that you don't burn the ABS motor or continue to drain your car battery.
When the ABS fuse is removed, your ABS functionality will be disabled. Your vehicle may take longer to stop, and it can skid. Keep a larger distance between you and the vehicle in front.
Replace the BMW ABS relay. The ABS relay costs less than $20, and it is very easy to replace. The relay on most BMWs is in the fuse box located in the engine bay.
If the problem remains, you may need to replace or repair the ABS unit.
Before replacing car parts, it is important to read the codes from your BMW.
Another option is to have the dealer replace the ABS hydraulic unit, which in most cases costs between $1000-$2000.
Or remove your failed ABS pump & control module and send it for repair to shops that specialize in repairing these ABS units. Look up these BMW ABS ATC Pump Module Repair on eBay services.