BMW DTC P1ADF – Drive Motor ‘B’ Control Module 14V Power Supply Circuit High
DTC P1ADF meaning on BMW
The DTC P1ADF on a BMW refers to the Drive Motor ‘B’ Control Module 14V Power Supply Circuit High fault. This diagnostic trouble code indicates that there is a high voltage condition detected in the power supply circuit for the drive motor ‘B’ control module.
BMW DTC P1ADF symptoms
Symptoms of the BMW DTC P1ADF may include:
- Check Engine Light (MIL) illuminated
- Reduced power or performance
- Vehicle may go into a limp mode
- Increased fuel consumption
BMW DTC P1ADF causes
Common causes of the BMW DTC P1ADF may include:
- Faulty drive motor ‘B’ control module
- Short circuit or open circuit in the power supply wiring
- Issues with the power supply relay
- Faulty battery or alternator
BMW DTC P1ADF seriousness
The BMW DTC P1ADF is a serious fault that should be addressed promptly. Ignoring this fault can lead to further damage to the vehicle’s electrical system and may result in drivability issues.
How to diagnose DTC P1ADF on BMW
To diagnose the DTC P1ADF on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the power supply wiring for any visible damage or corrosion
- Check the power supply relay for proper operation
- Test the voltage output of the battery and alternator
- Inspect the drive motor ‘B’ control module for any signs of damage
How to fix DTC P1ADF on BMW
To fix the DTC P1ADF on a BMW, the following steps may be taken:
- Repair or replace any damaged power supply wiring
- Replace the faulty drive motor ‘B’ control module
- Test and replace the power supply relay if necessary
- Ensure the battery and alternator are in good working condition
- Clear the fault codes and perform a test drive to confirm the issue is resolved
How to erase DTC P1ADF on BMW
To erase the DTC P1ADF on a BMW, the fault codes can be cleared using a diagnostic scanner. After the necessary repairs have been made and the issue has been resolved, the fault codes can be cleared to reset the Check Engine Light and ensure the fault does not reoccur.
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.