Jimmy Envoy threw me a service engine soon TODAY

[tdixon2002]

I was making a trip up the the mountains today. As I got off my exit, 99 envoy started throwing the Service Engine SOON!!! I pulled over and checked everything. It all seemed fine. I drove to the nearest Advance auto parts and ran the basic computer check. They said it was the "Manufacturer Transmission error". He said it might be a sensor. Well I drove it back home. When I get off the highway back at home which is about a 75 Mile road trip. My transmission was acting up going to into second gear. I mean it felt like someone was rear ending me. Any advice people? SHould I feel safe driving it around town? What would be causing the tranny to shift that hard going into second from first? I would like to fix it myself. So any, help would be of great help. Thanks.

[99sonoma4x4]

Bring it to a tranny shop

[87c10slammer]

your second gear servo is going out... mine has been doing the same thing for years now only when i take it on a long trip... mine is fine driving around town but if i drive it on the highway for more then an hour it will do it the first few times it shifts into second after i get off the highway... when i had my ecu reprogrammed to shift at higher rpms it accually helped it out... it may not fix your but it fixxed mine for the most part...

[s10gmconversion]

install a vette servo