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P1431 – BMW DTC

BMW DTC P1431 – Diagnostic Module Tank Leakage (DM-TL) Heater Control Circuit High

DTC P1431 meaning on BMW

The Diagnostic Trouble Code (DTC) P1431 for BMW refers to an issue with the Diagnostic Module Tank Leakage (DM-TL) Heater Control Circuit being detected as high. This code indicates a malfunction in the heating element control circuit of the DM-TL system, which is responsible for monitoring the fuel vapor system for leaks.

BMW DTC P1431 symptoms

Symptoms of DTC P1431 on a BMW may include:

  • Check Engine Light (MIL) illuminated
  • Decreased fuel efficiency
  • Increased emissions
  • Problems passing emissions tests

BMW DTC P1431 causes

Common causes of DTC P1431 on a BMW include:

  • Faulty DM-TL heater element
  • Wiring or connector issues in the DM-TL circuit
  • Defective DM-TL control module

BMW DTC P1431 seriousness

While DTC P1431 may not cause immediate drivability issues, it is important to address this code promptly to ensure proper functioning of the vehicle’s emissions system. Ignoring this code can lead to increased emissions and potential environmental impact.

How to diagnose DTC P1431 on BMW

To diagnose DTC P1431 on a BMW, you can perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault codes
  2. Inspect the DM-TL system components for any visible damage or corrosion
  3. Check the wiring and connectors for continuity and proper connection
  4. Test the DM-TL heater element for resistance

How to fix DTC P1431 on BMW

To fix DTC P1431 on a BMW, you can try the following solutions:

  1. Replace the faulty DM-TL heater element
  2. Repair any damaged wiring or connectors in the DM-TL circuit
  3. Replace the DM-TL control module if necessary

How to erase DTC P1431 on BMW

To erase DTC P1431 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. After addressing the underlying issue causing the code, clearing the code will reset the Check Engine Light and ensure proper operation of the emissions system.

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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