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V35 automatic transmission problem

camr33
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camr33

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V35 automatic transmission problem

Hi, Ive had my 350 GT coupe for a couple of year and its been pretty smooth sailing. However, I recently had an issue when I was driving home from work on xmas eve. As I was exiting a roundabout, I heard (moreso felt?) a thunk from the automatic transmission. The car would free-rev until about 4000rpm, then would throw you back into the seat with explosive acceleration. I pulled over and shut the car off for about 30 seconds.

 When I started ot up again, the AT check light was flashing at me like a maniac for a few seconds before switching off. I was able to drive home without any problems. A few days later, it did the same thing, however it happened when reversing out of a parking space and engaging drive. This time, there was no noise and the low down throttle response was better.

Online investigation on G35 driver etc indicates the car is locking 3rd gear as some sort of limp mode. This problem has come on suddenly, and the transmission works fine during regular use. Tiptronic mode works fine- the problem only now seems to happen when engaging drive. The AT light flashes a total of 16 times. From what Ive read, this particular error code is not logged in the ecu,  therefore a diagnostic is useless.

I had the transmission fluid replaced about 9 months ago as I am the first Aus owner of the car and didnt know when it was last done. When replaced, the old fluid was still really good. A few topics on G35  driver where people have had the same issue advised a transmission service, including changing the filter, fixed the issue. There has been a slight whine from the transmission when the car is first started in the morning- it sounds like someone using a whipper snipper at the end of the street, and fades in and out. This noise disappears after about 30 seconds and is very quiet. I have tried to record it, but cannot be heard when played back.

Long story short- has anyone experienced a similar issue? I dont have the money to fork out hundreds, if not thousands, of dollars trying to diagnose what the issue could be. So far, it could be a service issue,  a faulty sensor, some sort of pump in the tranny is on it's way out, or my transmission is outright stuffed (I don't think it is due to the way it drives and shifts). Any help or suggestions would be appreciated.

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https://www.sau.com.au/forums/topic/468693-v35-automatic-transmission-problem/
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