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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, 4WDREPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC P162BCIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Trailblazer ACTIV, 4WD

Circuit/System Verification

2025 Chevrolet Trailblazer ACTIV, 4WDSECTION Circuit/System Verification
  1. Verify the vehicle is equipped with OnStar (RPO UE1) and DTC P162B is set
    • If the vehicle is not equipped with OnStar (RPO UE1) and DTC P162B is set 

      Replace the ECM.

    • Go to next step: If the vehicle is equipped with OnStar (RPO UE1) and DTC P162B is set 
  2. Perform the Remote Vehicle Speed Limiting Reset procedure with the scan tool.
  3. Verify DTC P162B is not set.
    • If DTC P162B is set 
    1. Reprogram the ECM. Refer to Control Module References .
    2. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
      • If the DTC sets, replace the ECM. If the DTC continues to set after ECM replacement, replace the vehicle communication interface module.
      • Go to next step: If the DTC does not set
    3. All OK.
    • Go to next step: If DTC P162B is not set 
  4. 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.