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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, FWDREPAIR AND DIAGNOSISSTEERINGPOWER STEERING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0051CIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Trailblazer ACTIV, FWD

Circuit/System Verification

2025 Chevrolet Trailblazer ACTIV, FWDSECTION Circuit/System Verification

DTC C0051 4B

  1. Ignition ON.
  2. Verify that DTC C0051 4B is not set.
    1. Verify that DTC C0051 4B is not set.
      • If the DTC C0051 4B is set 

        Replace the Steering Column.

      • Go to next step: If the DTC C0051 4B did not set 

        Go to next step: All OK.

    • Go to next step: If the DTC C0051 4B is not set 
  3. All OK.

DTC C0051 58

  1. Verify that all harness connectors are installed properly at the K43 Power Steering Control Module.
    • If a harness connector at the K43 Power Steering Control Module is not installed properly 
    1. Connect the appropriate harness connector properly at the K43 Power Steering Control Module.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the Steering Column.
      • Go to next step: If the DTC does not set
    3. All OK.
    • Go to next step: If all harness connectors at the K43 Power Steering Control Module are installed properly 
  2. Ignition ON.
  3. Verify the scan tool Steering Wheel Angle parameter changes when turning the steering wheel.
    • If the parameter does not change 

      Replace the Steering Column.

    • Go to next step: If the parameter changes 
  4. All OK.

DTC C0051 5A

  1. Ignition ON.
  2. Verify that DTC C0051 5A is not set.
    • If the DTC C0051 5A is set 
    1. Verify that the steering wheel angle alignment is correct. Refer to Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment
    2. Calibrate the K43 Power Steering Control Module. Refer to Power Steering Control Module Calibration 
    3. Initialize the steering wheel angle sensor by driving the vehicle in a straight line at 20 kp/h (12 mp/h) for 2 seconds and then at 65 kp/h (40 mp/h) for 2 seconds.
    4. Verify that DTC C0051 5A is not set.
      • If the DTC C0051 5A is set 

        Replace the Steering Column.

      • Go to next step: If the DTC C0051 5A did not set 

        Go to next step: All OK.

    • Go to next step: If the DTC C0051 5A is not set 
  3. All OK.
RENDER: 1.0x

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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.