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P1646 – BMW DTC

BMW DTC P1646 – Internal Control Module Communication Error Output Stage

DTC P1646 meaning on BMW

DTC P1646 on a BMW indicates an Internal Control Module Communication Error Output Stage. This fault code is related to a communication issue within the control module that manages the output stage of the vehicle’s systems.

BMW DTC P1646 symptoms

Symptoms of BMW DTC P1646 may include:

  • Check Engine Light illuminated
  • Reduced engine performance
  • Problems with various vehicle systems

BMW DTC P1646 causes

Common causes of BMW DTC P1646 include:

  • Faulty control module
  • Wiring issues
  • Communication bus problems

BMW DTC P1646 seriousness

The seriousness of DTC P1646 on a BMW depends on the underlying cause. Ignoring this fault code can lead to further electrical system malfunctions and potential safety hazards. It is recommended to address this issue promptly.

How to diagnose DTC P1646 on BMW

To diagnose DTC P1646 on a BMW, a mechanic may perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault code
  2. Inspect the control module and wiring for any visible damage
  3. Check for communication errors on the vehicle’s network

How to fix DTC P1646 on BMW

To fix DTC P1646 on a BMW, the following steps may be taken:

  1. Repair or replace any damaged wiring or connectors
  2. Replace the faulty control module if necessary
  3. Clear the fault code and perform a test drive to ensure the issue is resolved

How to erase DTC P1646 on BMW

To erase DTC P1646 on a BMW, follow these steps:

  1. Use a diagnostic scanner to clear the fault code
  2. Ensure the repair has been completed successfully
  3. Perform a final check to confirm the fault code has been erased

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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