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P1820 – BMW DTC

BMW DTC P1820 – Gear Selector Lever GSL1 Circuit High

DTC P1820 meaning on BMW

The Diagnostic Trouble Code (DTC) P1820 for BMW refers to the Gear Selector Lever (GSL1) Circuit High. This code indicates that there is a high voltage condition detected in the circuit related to the gear selector lever.

BMW DTC P1820 symptoms

Symptoms of DTC P1820 on a BMW may include:

  • Difficulty shifting gears
  • Transmission not engaging properly
  • Check Engine Light illuminated on the dashboard

BMW DTC P1820 causes

Common causes of DTC P1820 on a BMW include:

  • Faulty gear selector lever
  • Wiring or connector issues in the GSL1 circuit
  • Defective transmission control module

BMW DTC P1820 seriousness

The seriousness of DTC P1820 on a BMW depends on the underlying cause. Ignoring this code can lead to transmission issues and potential safety hazards. It is recommended to address this code promptly to prevent further damage.

How to diagnose DTC P1820 on BMW

To diagnose DTC P1820 on a BMW, you can follow these steps:

  1. Use a diagnostic scanner to retrieve the fault codes
  2. Inspect the gear selector lever and its wiring for any visible damage
  3. Check the GSL1 circuit for continuity and proper voltage levels
  4. Test the transmission control module for functionality

How to fix DTC P1820 on BMW

To fix DTC P1820 on a BMW, you can try the following:

  1. Replace the faulty gear selector lever if necessary
  2. Repair any damaged wiring or connectors in the GSL1 circuit
  3. If the transmission control module is defective, consider replacing it

How to erase DTC P1820 on BMW

To erase DTC P1820 on a BMW, you can:

  1. Use a diagnostic scanner to clear the fault codes
  2. After fixing the underlying issue, drive the vehicle to allow the system to recheck and verify that 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

← All BMW Diagnostic Trouble Codes

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