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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONRESET PROCEDURESPROGRAMMING AND SETUP - ALL SYSTEMSREPAIR INSTRUCTIONSK71 TRANSMISSION CONTROL MODULE: PROGRAMMING AND SETUP (9T45 (M3F))REPLACE AND PROGRAM CONTROL MODULE
2025 Chevrolet Trailblazer ACTIV, 4WD

Replace and Program Control Module

2025 Chevrolet Trailblazer ACTIV, 4WDSECTION Replace and Program Control Module

To program a replacement K71 Transmission Control Module (TCM), perform the following procedure:

  1. Replace the K71 Transmission Control Module.
  2. Install EL-49642  SPS programming support tool
  3. Access the Service Programming System (SPS) and follow the on-screen instructions.
  4. Perform one of the following SPS Programming functions:
      NOTE:

      If both controller options below are listed, select K71 Transmission Control Module

    • K20/K71 Engine and Transmission Control Modules and follow the on-screen instructions
    • K71 Transmission Control Module and follow on-screen instructions.
  5. Perform the Refresh Characterization Data at the MCVM Characterization procedure, follow the on-screen instructions.
  6. Perform the Vehicle Setup, follow the on screen instructions.
  7. With a scan tool, clear DTCs from the K71 Transmission Control Module.
  8. Perform the scan tool configuration/reset function: Transmission Service Fast Learn - If available
    NOTE:

    If the transmission fluid temperature is not between 75 to 85°C (167 to 185°F) the scan tool will not allow the procedure to be performed.

  9. Ignition OFF for 2 minutes.
  10. All OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.