BMW DTC P1021 – VVL-Sensors Supply Voltage Circuit High (Bank 2)
DTC P1021 meaning on BMW
The Diagnostic Trouble Code (DTC) P1021 for BMW refers to the VVL-Sensors Supply Voltage Circuit High on Bank 2. This code indicates that there is a high voltage condition detected in the Variable Valve Lift (VVL) system’s sensor supply circuit on the second bank of the engine.
BMW DTC P1021 symptoms
Symptoms associated with DTC P1021 on a BMW may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Reduced engine performance
- Engine misfires
- Engine stalling or rough idling
BMW DTC P1021 causes
Common causes of DTC P1021 on a BMW include:
- Faulty VVL sensor on Bank 2
- Short circuit or open circuit in the sensor supply wiring
- Faulty engine control module (ECM)
- Intermittent electrical connection issues
BMW DTC P1021 seriousness
DTC P1021 should not be ignored as it can lead to potential engine performance issues and may cause further damage if left unresolved. It is recommended to address this code promptly to prevent any long-term problems.
How to diagnose DTC P1021 on BMW
To diagnose DTC P1021 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the VVL sensor on Bank 2 for any visible damage or corrosion
- Check the sensor supply wiring for continuity and proper voltage levels
- Perform a thorough inspection of the ECM and related components
How to fix DTC P1021 on BMW
To fix DTC P1021 on a BMW, you can consider the following actions:
- Replace the faulty VVL sensor on Bank 2
- Repair any short circuits or open circuits in the sensor supply wiring
- If necessary, replace the engine control module (ECM)
- Ensure all electrical connections are secure and free of corrosion
How to erase DTC P1021 on BMW
To erase DTC P1021 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM’s memory. After addressing the underlying issue and making the necessary repairs, you can reset the codes to turn off the Check Engine Light.
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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