Odd sound when transmission shifts from third gear to fourth gear?

2009 BMW 530D

12 MILES • 3.0L • 6 CYL • TURBO • 2WD • AUTOMATIC

MAHA51198

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I hear a weird sound when the gear is shifted from 3 to 4 at a particular speed. What should be the reason for this?

When the car is drive about 100kmph or sudden acceleration is given, the car shows a transmission error and the car is getting stopped. Then i have to clear the error to drive again. What may be the reason for this?

Sep 17, 2022 at 9:09 PM

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This happens when the transmission valve body and solenoids need to be replaced. This is because one of the solenoids is not closing completely. I could tell for sure if you could upload a short video of the noise here in your response. Just in case I have included how to change out the valve body so you can get a rebuilt unit to help fix the problem. Sometimes you can get away with replacing just the solenoid pack. Also, we should run the codes.

Check out this guide to help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

Images (Click to enlarge)

Sep 19, 2022 at 10:29 AM