why does my Cadillac Escalade T1XX (2021-Present) transmission slip when shifting?

Symptoms

• Transmission slips between gears during acceleration
• Unusual engine revving without corresponding vehicle speed increase
• Harsh or erratic shifting patterns
• Delayed engagement when shifting from park to drive
• Check engine light illuminated (possible transmission-related codes)

Diagnostic Steps

1. Scan the vehicle's OBD-II system for error codes related to the transmission.
2. Check the transmission fluid level and condition (color and odor).
3. Inspect the transmission fluid for contamination (metal shavings or debris).
4. Examine the transmission control module (TCM) for any software updates or malfunctions.
5. Test the transmission solenoids for proper operation with a multimeter.
6. Inspect the wiring and connectors associated with the transmission for damage or corrosion.

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, funnel, socket set, torque wrench.
• Remove the transmission fluid pan bolts using the socket set.
• Carefully lower the pan and drain the old fluid into a suitable container.
• Inspect the pan for metal shavings or debris; clean if necessary.
• Replace the transmission filter if applicable.
• Reinstall the pan with new gasket material and torque bolts to manufacturer specifications.
• Fill the transmission with new, manufacturer-recommended fluid using the pump and funnel.

3. Inspect and Replace Transmission Solenoids

• Tools Required: Socket set, multimeter, torque wrench.
• Locate the transmission solenoids based on service manual specifications.
• Disconnect the electrical connectors from the solenoids.
• Remove the solenoids and test them using a multimeter to ensure they operate within spec.
• If faulty, replace defective solenoids with new ones.
• Reinstall solenoids and reconnect electrical connectors.

4. Update TCM Software

• Tools Required: OBD-II scanner with programming capability.
• Connect the OBD-II scanner to the vehicle.
• Follow prompts to check for TCM software updates.
• If an update is available, follow the instructions to perform the update.