my Volvo XC90's transmission jerks when shifting what does this mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and securely elevated with jack stands.
• Disconnect the battery to avoid electrical shorts.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level.
  2. If the fluid is low, add the correct type of transmission fluid (consult owner’s manual for specifications).
  3. If the fluid appears dirty or burnt, drain the old fluid using a fluid pump, and replace it with new fluid.
  4. Reinsert the dipstick and start the engine; allow it to warm up, then recheck fluid levels.

3. Inspect and Repair Electrical Connections

• Sub-steps:
  1. Locate the harness connected to the TCM and transmission solenoids.
  2. Disconnect the wiring harness and inspect for corrosion or damage.
  3. Clean connectors with electrical contact cleaner and reconnect firmly.
  4. If any connectors are damaged, replace them as necessary.

4. Test Transmission Control Module (TCM)

• Sub-steps:
  1. Use a scan tool to access the TCM data and check for fault codes.
  2. If codes indicate a fault, consider reprogramming or replacing the TCM.
  3. Follow manufacturer's instructions for reprogramming if applicable.

5. Road Test

• Sub-steps:
  1. Reconnect the battery.
  2. Start the vehicle and conduct a test drive.
  3. Monitor shifting behavior and listen for abnormal noises.
  4. Check for any new error codes after the test drive.