BMW DTC P1012 – VVL-Reference Sensor Solenoid Loss (Bank 1)
DTC P1012 meaning on BMW
DTC P1012 on a BMW refers to a fault with the Variable Valve Lift (VVL) system’s reference sensor solenoid in Bank 1. This fault indicates that there is a loss of signal or communication error with the VVL reference sensor solenoid in the engine bank 1.
BMW DTC P1012 symptoms
Symptoms of DTC P1012 on a BMW may include rough idling, reduced engine performance, engine misfires, decreased fuel efficiency, and in some cases, the vehicle may go into a limp mode where power is limited.
BMW DTC P1012 causes
The common causes of DTC P1012 on a BMW include a faulty VVL reference sensor solenoid, wiring issues such as shorts or open circuits, or a malfunction in the engine control module (ECM) that controls the VVL system.
BMW DTC P1012 seriousness
While DTC P1012 may not cause immediate harm to the vehicle, it can lead to poor engine performance and reduced fuel efficiency. Ignoring this fault can potentially cause further damage to the engine over time.
How to diagnose DTC P1012 on BMW
To diagnose DTC P1012 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes from the vehicle’s ECM. They would then inspect the VVL reference sensor solenoid, check the wiring for any issues, and perform tests to ensure proper signal communication.
How to fix DTC P1012 on BMW
Fixing DTC P1012 on a BMW usually involves replacing the faulty VVL reference sensor solenoid, repairing any damaged wiring, or reprogramming the ECM if necessary. It is recommended to use genuine BMW parts for replacements to ensure proper functionality.
How to erase DTC P1012 on BMW
Once the underlying issue causing DTC P1012 on a BMW has been fixed, the fault code can be erased using a diagnostic scanner. The mechanic would clear the code from the ECM memory, and if the issue has been successfully resolved, the code should 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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