How to Replace Throttle Position Sensor 01-02 GMC Sierra 2500 Truck
Difficulty: Intermediate · About 35 min · Gmc Sierra
Replace the throttle position sensor on a 2001–2002 GMC Sierra 2500 after verifying the sensor or circuit is faulty. Access requires moving the intake hose and alternator belt.
Tools you will need
- Flat blade screwdriver
- T20 driver
- 15 mm socket and ratchet
Parts and supplies
- Throttle position sensor
Steps
Expose the sensor
With the engine off and cool, loosen the intake hose clamp and move the hose aside. Release belt tension and slip the belt off the alternator pulley, noting its routing first.
Move the alternator and remove the old sensor
Remove one alternator fastener and loosen the other enough to lift the alternator for access. Unplug the sensor connector, remove its two T20 fasteners, and lift the sensor away.
Install the replacement sensor
Seat the replacement sensor in the same orientation and start both fasteners by hand before snugging them. Reconnect the electrical plug and ensure its lock clicks into place.
Restore the belt and intake hose
Lower the alternator into position and tighten its fasteners securely. Release belt tension, reinstall the belt along its original route, then refit the intake hose and tighten its clamp.
Check operation
Inspect belt alignment and confirm the intake hose is fully seated. Start the engine and check for warning lights or abnormal idle; diagnose the circuit if the symptom remains.
Check your vehicle’s repair manual for exact specifications and fit.