my Cadillac Escalade T1XX (2021-Present) transmission slips when shifting gears what's wrong

Symptoms

• Transmission slips during acceleration
• Delayed engagement when shifting from park to drive or reverse
• Unusual whining or grinding noises from the transmission
• Check engine light illuminated
• Poor fuel economy
• Fluid leaks under the vehicle

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to identify potential transmission-related fault codes.
2. Check the transmission fluid level and condition, looking for signs of contamination or burning.
3. Inspect the transmission fluid for leaks at the seals and gaskets.
4. Test the transmission solenoids for proper function using a multimeter.
5. Inspect the transmission control module for faults or miscommunication with the engine control unit.
6. Perform a road test to replicate the slipping issue under various driving conditions.

Solution

1. Preparation

• Gather tools including an OBD-II scanner, socket set, multimeter, and a torque wrench.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shocks.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level.
  2. If low, add the recommended transmission fluid type (Dexron VI for Cadillac).
  3. If fluid is dark or smells burnt, proceed to drain and replace it.
  4. Locate the transmission drain plug, remove it, and allow the old fluid to fully drain.
  5. Replace the drain plug and torque to manufacturer specifications.
  6. Refill the transmission with the new fluid using the dipstick tube.

3. Inspect and Replace Transmission Filter

• Sub-steps:
  1. Remove the transmission pan by unscrewing the bolts and gently prying it off.
  2. Inspect the transmission filter and replace it if clogged or damaged.
  3. Clean the transmission pan and magnet to remove any metal shavings.
  4. Reinstall the new filter and secure the pan with a new gasket.
  5. Torque the pan bolts to manufacturer specifications.

4. Test Transmission Solenoids

• Sub-steps:
  1. Disconnect the electrical connector from the solenoid.
  2. Use a multimeter to test the resistance of the solenoid according to manufacturer specifications.
  3. If out of spec, replace the faulty solenoid.
  4. Reconnect the solenoid and ensure all connections are secure.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear any diagnostic trouble codes.
  3. Start the engine and check for any persistent codes.