GP

Gideon P.

Solved Solved

Passat 35i Transmission Problems at Operating Temperature | VW

Hello, I wanted to contact the FabuCar community because I think it's too stupid to register in a thousand forums and publish a post there, so here it is. I have a problem with the transmission on my Passat 35i when the engine reaches operating temperature. Between 70 and 90 degrees, the transmission starts to jerk when I turn on position D. I have attached a video in which the problem is visible. There is a noise in the engine compartment, which indicates that the transmission is acting up. The transmission works perfectly when it is cold. Only when it has reached a certain temperature and a certain clicking occurs at a relatively medium distance inside does the transmission stop working. I can tell from the clicking that it starts to jerk again.

After trying everything possible that could lead to a solution, nothing worked. So I'm really at the end of my rope at the moment.

So my question is, is there anyone who has had similar symptoms and found a fault? Does anyone happen to have the circuit diagram for the control unit or the complete wiring harness from the control unit to the transmission and external sensors? Or are there other components such as sensors that are not in the transmission that are controlled via the control unit? That would be my next solution, that a sensor, which I unfortunately don't know about yet, may be defective. If anyone knows anything: even small things can help me to finally solve this problem. I've been working on it for several months now.

Thanks

Already checked

Automatic transmission jerks at operating temperature. Driver seeks wiring diagrams, possible sensors, or other components influencing transmission control.

#Gearbox

VW

💬15

Own solution

Gideon P.

I found the solution myself. Apparently, it was the sensor in the throttle valve or the connector. After unplugging it and plugging it back in, everything suddenly works again. What an effort for such a stupid sensor! But, as I said, it didn't leave any error code in the error memory, and the error only occurred when I accelerated. If I completely disconnect the connector, this jerking no longer occurs. Regarding the term 'only starts at a certain temperature,' the exhaust is located directly behind it, and a lot of heat rises there, so I might have found the problem now.

Comments (15)

Sort by: Oldest first
  1. Alexander P.

    Did you also replace the converter? Did you fill in the correct amount of oil?

    2
  3. Rene

    Are you sure it's coming from the transmission? Was it confirmed by the workshops you visited? Is everything definitely okay with the chassis/drive shafts, etc.?

    2
  4. Birger S.

    Did you check the compact connector on the transmission to see if it's clean and securely seated?

  5. Gideon P.

    Good day, I am certain that it is not coming from the drive shafts, as we had completely removed them during the gearbox replacement. We also checked everything to see if there were any potential sources of error.

  7. Gideon P.

    Good day, the connectors on the transmission were checked during external installation of the transmission, sprayed with contact spray, and cleaned. They were cleaned as far as they needed to be, but they were actually all clean anyway.

  8. Gideon P.

    Good day, the converter with complete oil was replaced together, I drove the donor vehicle to my home myself and the transmission ran perfectly.

  9. Alexander P.

    It sounds strange that the error is still there. Check the flywheel on the engine to make sure there is no imbalance. However, the transmission has to be removed again to do this.

    1
  10. Gideon P.

    Yes, I could try that, of course, but unfortunately I don't feel like it at the moment as I have just replaced the transmission. But I could tackle that or take a look, thanks

  11. Gelöschter N.

    Hi, you said the donor vehicle ran very well and you didn't notice any issues. In my opinion, the simplest but also most difficult thing would be to take the engine + transmission from the donor vehicle and install it in yours.

  12. Gideon P.

    Hello, yes, that would of course also be a good idea. I already asked VW about that and they told me that it wouldn't be that easy to simply exchange it, I have no idea why and they didn't tell me. But it would be worth a try.

  13. Heinrich T.

    Perhaps it is not enough to just change the transmission oil, but rather a transmission flush with cleaning of the filters and screens.

    1
  14. Gideon P.

    Hello, I had actually considered that, but since I changed the transmission oil and installed a functional one from a donor vehicle, but certainly drove it beforehand, I'll just rule out that I would necessarily need a transmission flush now. Of course, if the whole thing works, the car would get a transmission flush anyway, but first I have to find this problem.

  15. Matze

    Flush the transmission and clean the Multitronic.

  16. Gideon P.

    I would like to do a transmission flush, but the problem is that it doesn't seem to be the transmission that is defective, but some part around it, since the transmission was completely replaced and it works perfectly in the donor vehicle. So theoretically I wouldn't need a transmission flush, but if I find the problem, it will definitely get one.