2004 s80 2.9 Transmission problems and check engine light

Msimon288 · Post by **Msimon288** » 10 Oct 2022, 11:17

Hi recently my car was sitting for a few months and I started driving it again a couple days ago but yesterday shifting to 3rd gear was rough and I heard a weird sound and the transmission service urgent light came on as well as the check engine light I got the codes pulled and will leave them below I just want to know if there’s a simple problem that would cause this, if I need a new valve body, or if the codes are major and I should order a used tranny today.
Po700- transmission control system(malfunction indicator lamp request)
Po751- (shift solenoid a performance or stuck off)
Po733- gear 3 incorrect ratio
Po734- gear 4 incorrect ratio

Any help is appreciated

Post by **MoVolvos** » 10 Oct 2022, 20:02

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According to FCP you have the same transmission, Volvo/GM 4T65, which is the same as the 2003 S80 T6. If so, all you can do is change the filter, do a flush and install the TransGo Shift Kit. These transmissions are very sensitive to low fluid and can go bad very quickly if not caught or neglected.

Drop the pan first and if you see lot of metal flakes, you can pretty much say good bye as I did mine. Didn't catch a leak in time.

viewtopic.php?f=11&t=88630&p=504849#p504849

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