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P177A – BMW DTC

BMW DTC P177A – TCM Internal Error no Shifting despite of Driver Command

DTC P177A meaning on BMW

The Diagnostic Trouble Code (DTC) P177A on a BMW indicates a Transmission Control Module (TCM) Internal Error, resulting in the transmission not shifting despite the driver’s commands.

BMW DTC P177A symptoms

Symptoms of the BMW DTC P177A may include:

  • Transmission not shifting despite driver input
  • Slipping gears
  • Harsh shifting
  • Transmission stuck in one gear

BMW DTC P177A causes

Possible causes of the BMW DTC P177A include:

  • Internal fault within the Transmission Control Module (TCM)
  • Faulty wiring or connections to the TCM
  • Software issues within the TCM
  • Mechanical issues within the transmission

BMW DTC P177A seriousness

The BMW DTC P177A is a serious issue as it can lead to drivability problems and potential safety hazards. It is important to address this issue promptly to avoid further damage to the transmission system.

How to diagnose DTC P177A on BMW

To diagnose the DTC P177A on a BMW, a comprehensive diagnostic scan using a BMW-specific diagnostic tool is recommended. The following steps can help in diagnosing the issue:

  1. Retrieve the DTC codes from the TCM
  2. Inspect the wiring and connections to the TCM for any damage or corrosion
  3. Check for any software updates or reprogramming needed for the TCM
  4. Perform a thorough inspection of the transmission system for any mechanical issues

How to fix DTC P177A on BMW

Fixing the BMW DTC P177A may involve the following steps:

  1. Repair or replace any faulty wiring or connections to the TCM
  2. Update or reprogram the TCM software if necessary
  3. Address any mechanical issues within the transmission system
  4. If the TCM is found to be faulty, it may need to be replaced

How to erase DTC P177A on BMW

To erase the DTC P177A on a BMW, the issue causing the fault code must first be diagnosed and fixed. Once the underlying problem is resolved, the fault codes can be cleared using a BMW diagnostic tool. This will reset the system and remove the DTC P177A code from the vehicle’s memory.

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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