how to fix GMC Sierra transmission jerking when shifting

Learn how to diagnose and fix transmission jerking in GMC Sierra. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Change Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, drain pan
• Steps:
  1. Place the drain pan under the transmission pan and remove the drain plug or pan bolts to drain the old fluid.
  2. Remove the transmission pan and clean the surface with a scraper.
  3. Replace the transmission filter, ensuring it is seated properly.
  4. Reinstall the transmission pan with a new gasket and torque bolts to manufacturer specifications (usually around 10-15 ft-lbs).
  5. Refill the transmission with the correct type of fluid (check the owner’s manual for specifications).

3. Inspect and Replace Solenoids (if necessary)

• Tools Required: Socket set, torque wrench, multimeter
• Steps:
  1. Locate the transmission solenoids based on your specific model (consult repair manual).
  2. Disconnect the electrical connectors and remove the solenoids.
  3. Use a multimeter to test each solenoid for resistance as per manufacturer specifications.
  4. If faulty, replace with new solenoids, ensuring proper seating and connection.

4. Check and Replace Sensors (if necessary)

• Tools Required: Socket set, multimeter
• Steps:
  1. Locate the throttle position sensor (TPS) and vehicle speed sensor (VSS).
  2. Disconnect the electrical connectors.
  3. Test each sensor using a multimeter for proper voltage and resistance.
  4. Replace sensors if they do not meet specifications.