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Home/DTC Codes/GMC/Envoy/2002-2009 4.2L I6/U0302
U0302

Software Incompatibility with TCM

2002-2009 GMC Envoy 4.2L I6

High SeverityNetworkGeneric (SAE)

Description

The data from the Transmission Control Module is incompatible or corrupted.

Symptoms

  • Transmission shift problems
  • Harsh shifting
  • Check Engine Light
  • Transmission warning light

Common Causes

  • TCM software mismatch
  • TCM programming incomplete
  • Wrong TCM calibration
  • TCM-ECM version conflict

Diagnostic Steps

  1. Check TCM software version
  2. Compare ECM and TCM software compatibility
  3. Reprogram TCM
  4. Check for TSBs
  5. Verify correct calibration file

Repair Notes

Reprogram TCM with correct calibration that matches the ECM software version.

Related Codes

U0101Lost Communication with TCMU0301Software Incompatibility with ECM/PCM

Other Network Codes

U0302 on Other Vehicles

GMC Acadia

2017-2024 2.5L I4

GMC Acadia

2017-2024 3.6L V6

GMC Canyon

2004-2012 2.8L I4

GMC Canyon

2004-2012 3.5L I5

GMC Canyon

2007-2012 2.9L I4

GMC Canyon

2007-2012 3.7L I5

GMC Canyon

2015-2022 2.8L I4 Duramax Diesel

GMC Canyon

2015-2022 3.6L V6

Common Questions

What does code U0302 mean on a 2002-2009 GMC Envoy?

U0302 stands for "Software Incompatibility with TCM". The data from the Transmission Control Module is incompatible or corrupted.

What are the symptoms of U0302 on a GMC Envoy?

Common symptoms of U0302 include: Transmission shift problems, Harsh shifting, Check Engine Light, Transmission warning light.

What causes U0302 on a 2002-2009 GMC Envoy?

Common causes of U0302 include: TCM software mismatch, TCM programming incomplete, Wrong TCM calibration, TCM-ECM version conflict.

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