BMW DTC P0651 – Sensor Reference Voltage ‘B’ Circuit/Open
DTC P0651 meaning on BMW
The Diagnostic Trouble Code (DTC) P0651 for BMW indicates an issue with the Sensor Reference Voltage ‘B’ Circuit/Open. This means that there is a problem with the electrical circuit responsible for providing reference voltage to a sensor in the vehicle.
BMW DTC P0651 symptoms
Symptoms of DTC P0651 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Engine running rough or misfiring
- Reduced engine performance
- Difficulty starting the vehicle
BMW DTC P0651 causes
Common causes of DTC P0651 on a BMW include:
- Faulty sensor requiring reference voltage
- Wiring or connector issues in the sensor circuit
- Defective Engine Control Module (ECM)
BMW DTC P0651 seriousness
The seriousness of DTC P0651 on a BMW depends on the underlying cause. Ignoring this issue can lead to further damage to the vehicle’s components and may result in poor engine performance or even engine stalling.
How to diagnose DTC P0651 on BMW
To diagnose DTC P0651 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connectors related to the sensor reference voltage circuit
- Test the sensor for proper operation
- Check the ECM for any faults
How to fix DTC P0651 on BMW
To fix DTC P0651 on a BMW, you can try the following:
- Repair or replace any damaged wiring or connectors in the sensor circuit
- Replace the faulty sensor if necessary
- If the ECM is faulty, consider reprogramming or replacing it
How to erase DTC P0651 on BMW
To erase DTC P0651 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. After fixing the underlying issue, clearing the codes will reset the Check Engine Light and ensure the system is functioning properly.
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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