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P1870 – BMW DTC

BMW DTC P1870 – Gear Selector Lever GSL3 Circuit Low

DTC P1870 meaning on BMW

DTC P1870 on a BMW refers to the Gear Selector Lever (GSL3) Circuit Low. This diagnostic trouble code indicates that there is a low voltage condition detected in the circuit related to the gear selector lever.

BMW DTC P1870 symptoms

Symptoms of DTC P1870 on a BMW may include:

  • Difficulty shifting gears
  • Transmission slipping
  • Harsh shifting
  • Check Engine Light illuminated

BMW DTC P1870 causes

Common causes of DTC P1870 on a BMW include:

  • Faulty gear selector lever
  • Wiring issues in the GSL3 circuit
  • Defective transmission control module

BMW DTC P1870 seriousness

DTC P1870 should be addressed promptly as it can lead to transmission issues and affect the drivability of the vehicle. Ignoring this code may result in further damage to the transmission system.

How to diagnose DTC P1870 on BMW

To diagnose DTC P1870 on a BMW, a mechanic can perform the following 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 transmission control module for proper operation
  4. Perform a voltage test on the GSL3 circuit to identify the low voltage condition

How to fix DTC P1870 on BMW

To fix DTC P1870 on a BMW, the following steps can be taken:

  1. Replace the faulty gear selector lever if necessary
  2. Repair any damaged wiring in the GSL3 circuit
  3. Replace the transmission control module if it is found to be defective
  4. Clear the fault codes and test drive the vehicle to ensure the issue is resolved

How to erase DTC P1870 on BMW

To erase DTC P1870 on a BMW, the fault codes can be cleared using a diagnostic scanner. After the repairs have been made and the issue resolved, the codes can be cleared to reset 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

← All BMW Diagnostic Trouble Codes

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