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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER LT, 1.2L ENG VIN PREPAIR AND DIAGNOSISGENERAL INFORMATIONRESET PROCEDURESPROGRAMMING AND SETUP - ALL SYSTEMSREPAIR INSTRUCTIONSK20 ENGINE CONTROL MODULE: PROGRAMMING AND SETUPUNSUCCESSFUL PROGRAMMING RECOVERY
2025 Chevrolet Trailblazer LT, 1.2L Eng VIN P

Unsuccessful Programming Recovery

2025 Chevrolet Trailblazer LT, 1.2L Eng VIN PSECTION Unsuccessful Programming Recovery

If programming a control module is not successful, perform the following procedure:

  1. Verify the control module, data link connector and programming tool connections are secure and the tool software is up to date.
  2. Ignition - On / Vehicle - In Service Mode
  3. Access the Service Programming System and follow the on-screen instructions for the control module: K20 Engine Control Module
    4. NOTE:

    If both controller options below are listed, select K20 Engine and K71 Transmission Control Modules.

  4. Perform the SPS function:
    • K20 Engine Control Module - Follow the on-screen instructions.
    • K71 Transmission Control Module - Follow the on-screen instructions.
  5. Perform the scan tool function: Clear DTCs
  6. Ignition/Vehicle - Off - For greater than 1 min
  7. Ignition - On / Vehicle - In Service Mode
  8. Verify the control module programming is successful.
    • If the programming is not successful 
    1. Ignition/Vehicle - Off - For greater than 1 min
    2. Ignition - On / Vehicle - In Service Mode
      3. NOTE:

      If both controller options below are listed, select K20 Engine and K71 Transmission Control Modules.

    3. Perform the SPS function:
      • K20 Engine Control Module - Follow the on-screen instructions.
      • K71 Transmission Control Module - Follow the on-screen instructions.
      • If the programming is not successful - Replace the appropriate component: K20 Engine Control Module or K71 Transmission Control Module
      • Go to next step: If the programming is successful
    4. All OK.
    • Go to next step: If the programming is successful 
  9. 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.