why does my Alfa Romeo Giulia 952 (2016-Present) transmission jerk when shifting?

Symptoms

• Jerking or harsh shifting between gears
• Delayed or sluggish response during acceleration
• Unusual noise during gear changes
• Check engine light illuminated
• Fluid leakage under the vehicle
• Increased engine RPMs without corresponding vehicle acceleration

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to identify any fault codes related to the transmission.
2. Check the transmission fluid level and condition; look for discoloration or burnt smell.
3. Inspect the transmission control module (TCM) for any visible damage or corrosion.
4. Test the transmission fluid pressure using a pressure gauge to ensure it is within specifications.
5. Conduct a visual inspection of the transmission mounts and linkage for wear or damage.
6. Perform a road test to replicate the issue and observe the behavior of the transmission during shifts.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and secure it with jack stands.
• Disconnect the battery to prevent electrical shocks.

2. Replace Transmission Fluid and Filter

• Sub-steps:
  1. Drain the old transmission fluid by removing the drain plug or pan.
  2. Remove the transmission pan to access the filter; clean the pan thoroughly.
  3. Replace the old transmission filter with a new one.
  4. Reinstall the transmission pan with a new gasket; torque the bolts to the manufacturer's specifications (usually around 8-10 Nm).
  5. Refill the transmission with new fluid, using the recommended type (ATF specific to Alfa Romeo).

3. Reprogram Transmission Control Module (if necessary)

• Sub-steps:
  1. Connect the OBD-II scanner and access the transmission control module settings.
  2. Follow the prompts to reset or reprogram the TCM to adapt to new fluid characteristics.

4. Check Transmission Mounts and Linkage

• Sub-steps:
  1. Inspect the transmission mounts for cracks or degradation; replace if damaged.
  2. Adjust or replace the linkage if there is any play or misalignment.