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P1771 – BMW DTC

BMW DTC P1771 – CAN Torque Interface Plausibility

DTC P1771 meaning on BMW

The Diagnostic Trouble Code (DTC) P1771 for BMW refers to a CAN (Controller Area Network) Torque Interface Plausibility issue. This means that there is a discrepancy or inconsistency detected between the torque requested by the engine control module and the torque actually being delivered by the transmission control module via the CAN communication network.

BMW DTC P1771 symptoms

Symptoms of DTC P1771 on a BMW may include:

  • Harsh shifting
  • Transmission slipping
  • Reduced fuel efficiency
  • Check Engine Light (CEL) illuminated on the dashboard

BMW DTC P1771 causes

The common causes of DTC P1771 on a BMW can include:

  • Faulty torque sensor
  • Issues with the transmission control module
  • Wiring or connection problems in the CAN network
  • Software glitches in the engine or transmission control modules

BMW DTC P1771 seriousness

The seriousness of DTC P1771 on a BMW should not be ignored, as it can lead to potential drivability issues and further damage to the transmission system if left unresolved. It is recommended to address this issue promptly to prevent any long-term complications.

How to diagnose DTC P1771 on BMW

To diagnose DTC P1771 on a BMW, a comprehensive diagnostic scan tool capable of reading transmission fault codes is required. The following steps can be taken:

  1. Retrieve the DTC P1771 code using a diagnostic scanner
  2. Check for any other related codes or symptoms
  3. Inspect the torque sensor and its wiring for any visible damage
  4. Perform a CAN network test to identify communication issues
  5. Test the transmission control module for proper functionality

How to fix DTC P1771 on BMW

Fixing DTC P1771 on a BMW may involve the following steps:

  1. Replace the faulty torque sensor if necessary
  2. Repair any damaged wiring or connections in the CAN network
  3. Update the software in the engine and transmission control modules
  4. Reset the transmission adaptations using a diagnostic tool
  5. Perform a test drive to ensure the issue has been resolved

How to erase DTC P1771 on BMW

To erase DTC P1771 on a BMW, follow these steps:

  1. Use a diagnostic scanner to clear the fault codes
  2. Ensure that the underlying issue causing the fault code has been addressed
  3. Perform a final scan to confirm that the DTC P1771 has been successfully 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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