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P1020 – BMW DTC

BMW DTC P1020 – VVL-Sensors Supply Voltage Circuit Low (Bank 1)

DTC P1020 meaning on BMW

DTC P1020 on a BMW refers to the VVL-Sensors Supply Voltage Circuit Low in Bank 1. This diagnostic trouble code indicates that there is a low voltage condition detected in the Variable Valve Lift (VVL) system’s sensor supply circuit on the bank 1 side of the engine.

BMW DTC P1020 symptoms

Symptoms of BMW DTC P1020 may include:

  • Check Engine Light (MIL) illuminated
  • Reduced engine performance
  • Engine misfires
  • Rough idling
  • Decreased fuel efficiency

BMW DTC P1020 causes

Common causes of BMW DTC P1020 include:

  • Faulty VVL sensor
  • Wiring or connector issues in the sensor circuit
  • Low voltage supply to the sensor
  • ECU (Engine Control Unit) malfunction

BMW DTC P1020 seriousness

While BMW DTC P1020 may not always result in immediate drivability issues, it is important to address this fault promptly to prevent potential engine performance problems and further damage to the VVL system components.

How to diagnose DTC P1020 on BMW

To diagnose BMW DTC P1020, follow these steps:

  1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
  2. Inspect the VVL sensor and its wiring for any visible damage or corrosion
  3. Check the voltage supply to the sensor using a multimeter
  4. Perform continuity tests on the sensor circuit
  5. Check for any stored codes related to the VVL system

How to fix DTC P1020 on BMW

To fix BMW DTC P1020, consider the following:

  • Replace the faulty VVL sensor if necessary
  • Repair any damaged wiring or connectors in the sensor circuit
  • Ensure proper voltage supply to the sensor
  • Reset the fault codes and perform a test drive to verify the repair

How to erase DTC P1020 on BMW

To erase DTC P1020 on a BMW:

  1. Use a diagnostic scanner to clear the fault code
  2. If the underlying issue has been fixed, the MIL should turn off after a successful code clearing
  3. Perform a final check to ensure the code does not return

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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