why is my Volvo XC90's transmission slipping when I shift gears

Solution

1. Preparation

• Gather tools and parts before starting the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, fluid catch pan.
• Remove the transmission pan using a socket set.
• Allow old fluid to drain into a catch pan.
• Inspect the pan for metal shavings or debris; replace if necessary.
• Clean the pan and replace the filter if equipped.
• Reinstall the pan with a new gasket, torquing to manufacturer specifications.
• Refill the transmission with the correct type and amount of fluid as per the owner's manual.

3. Inspect and Replace Transmission Solenoids

• Tools Required: Socket set, torque wrench, multimeter.
• Locate the transmission solenoids, usually accessed from the top or side of the transmission.
• Disconnect electrical connectors and remove the solenoids.
• Test each solenoid with a multimeter for continuity; replace any faulty solenoids.
• Reinstall the new solenoids and reconnect wiring.

4. Reconnect Battery and Test

• Reconnect the battery and clear any error codes using the OBD-II scanner.
• Start the vehicle and perform a short test drive to ensure proper shifting and to check for any remaining issues.