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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 971 (ENGINE CONTROLS - 8.1L (INTRODUCTION))REPAIR INSTRUCTIONSCRANKSHAFT POSITION (CKP) SENSOR 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 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: In order to prevent damage to the crankshaft position (CKP) sensor reluctor wheel/ring care must be used when removing or installing this component.
    Fig 1: View Of Fuel Pipe Bracket & Nut At Bellhousing
    GM1238747Courtesy of GENERAL MOTORS CORP.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the fuel line bracket nut.
  3. Remove the fuel line bracket from the bellhousing stud.
  4. Lower the vehicle.
    5. Fig 2: View Of Engine Harness Grounds And CKP Sensor And Oil Pressure Sensor Electrical Connectors
    GM1235690Courtesy of GENERAL MOTORS CORP.
  5. Remove the driver side rear ignition coil bolts.
  6. Reposition the ignition coil.
  7. Disconnect the crankshaft position (CKP) sensor electrical connector (4).
  8. Use penetrating oil and allow the oil to soak around the CKP sensor prior to removing the sensor.
    9. Fig 3: View Of CKP Sensor & Bolt
    GM1150725Courtesy of GENERAL MOTORS CORP.
  9. Remove the CKP sensor bolt.
  10. Twist the CKP sensor back and forth.
  11. Pull the sensor straight up in order to remove the CKP sensor.
  12. Inspect the CKP sensor for wear.
    IMPORTANT: The CKP sensor is designed to contact the reluctor wheel of the crankshaft. Wear may be noticeable on the end of the sensor.
  13. Normal CKP sensor wear will be shown on the wear strips (1) and no wear will be shown on the sensor sensing element (2).
    Fig 4: Checking CKP Sensor Wear
    GM814961Courtesy of GENERAL MOTORS CORP.
    14. Fig 5: Excessive Or Abnormal CKP Sensor Wear
    GM814962Courtesy of GENERAL MOTORS CORP.
  14. Excessive or abnormal sensor wear will be shown on the sensing element (2).
  15. If excessive/abnormal wear is present, replace the sensor.
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.