I have a 94 GC with 3.3l and 4 speed automatic. The trans was rebuilt a little under 2 years ago.
A couple of days ago, it jumped into limp mode while my wife was driving.
I bit the bullet and took it to the best shop I knew of. They read the computer at no charge! "Code 41" from the trans computer. They said I would have to leave the van for further diagnostics. Possibles were 1) Solenoid Pack, 2) Sensor, 3) wiring.
After further diagnostics, it turned out to be the solenoid pack. They were unsure if I would need a new computer or not, but since the new pack has been installed, and everything reset, the van is shifting smoothly and running well again!
Cost: $95 for labour, $205 for parts + taxes = $342 CDN$
This included dropping the pan for an inspection, and the replacement of the trans oil and filter with ATF +4. I know some people dont like it for my vintage tranny, prefering ATF +3, but I figure it has gotta be better then the Dexron III with lubguard that was in there from the rebuilders! :(
A question though...
From reading here, I did ask the trans shop about flashing the latest firmware into the computer. They said that this is no longer done, and that computers are simply replaced. My retort was "How lucrative". Lets fact it, it only should take less than 30 min to flash an old computer, but a new one is balparked at $400 - 500!
Anyonw know if the old computers are still flashable? It looks like mine has fins on the side. What do dealers charge for this? And should I just not bother on the principle of "if it ain't broke don't fix it"???
Thanks