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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1517 (SHIFT INTERLOCK SYSTEM)REPAIR INSTRUCTIONSAUTOMATIC TRANSMISSION SHIFT LOCK ACTUATOR REPLACEMENTREMOVAL PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: I/P Wiring Harness Clip & Floor Shift Control
    GM73236Courtesy of GENERAL MOTORS CORP.
  1. Remove the console. Refer to Console Replacement in Instrument Panel, Gages and Console.
  2. Remove the I/P accessory trim plate. Refer to Trim Plate Replacement - Instrument Panel (I/P) Accessory in Instrument Panel, Gages and Console.
  3. Disconnect the floor shift control electrical connector.
  4. Disconnect the I/P wiring harness clip from the floor shift control and reposition the harness.
  5. Remove the shift control boot. Refer to Floor Shift Control Boot Replacement .
    6. Fig 2: Automatic Transmission Shift Lock Control Actuator Electrical Connector
    GM190956Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the automatic transmission shift lock control actuator electrical connector.
    7. Fig 3: Automatic Transmission Shift Lock Actuator Lower Clip
    GM190958Courtesy of GENERAL MOTORS CORP.
  7. Using a flat-bladed screwdriver, carefully unsnap the automatic transmission shift lock actuator lower clip attachment from the shift control pivot arm stud.
    8. Fig 4: Solenoid Plunger & Shift Control Pivot Arm Stud
    GM190963Courtesy of GENERAL MOTORS CORP.
  8. Allow the solenoid plunger to extend while positioning the plunger (with lower attachment) above the shift control pivot arm stud.
  9. Carefully unsnap the remaining automatic transmission shift lock actuator clip attachment.

    Rotate the solenoid body clockwise slightly while unsnapping the clip from the bottom with a flat-bladed screwdriver.

    10. Fig 5: Automatic Transmission Shift Lock Actuator & Floor Shift Control
    GM191021Courtesy of GENERAL MOTORS CORP.
  10. Remove the automatic transmission shift lock actuator from the floor shift control.
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.