2005 C6 A4 Transmission Problems
Thread Starter
3rd Gear
Joined: Mar 2007
Posts: 3
Likes: 0
From: Sanger, Texas
2005 C6 A4 Transmission Problems
I have had my C6 into the dealer 3 times for the same problem. The Check Engine Light comes on and the Main computer reports a transmission fault. Transmission goes into failsafe mode and begins shifting very hard from first to second. I am told this is to keep the transmission from slipping and building up heat. After incident number 2 the torque convertor was replaced after finding debris in the transmission pan, but after 100 miles the problem came back. Does anyone have any suggestions as to what the problem might be?
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
it was a tsb but i cant find it i had it done on mine trans is a mis machined case metal paticals get into shift selonoid screen. they are suppose to replace a and b shift selonoid with valvebody and screen if it happens again they should rebuild trans.
Thread Starter
3rd Gear
Joined: Mar 2007
Posts: 3
Likes: 0
From: Sanger, Texas
C6 A4 miseries
My pride and joy is now back at the dealer for the 4th time for the same problem. Check engine light comes on, trans goes into failsafe mode, shift from first to second is ver jarring. When the dealer go it the third time the tech deleted the freeze frame trace from the computer instead of saving it and they were unable to diagnose the problem. So I drove it for 100 miles at freeway speeds (here is SoCal that means 80mph) and bingo the light comes on and the trans fault is registered.
Racer
Joined: Aug 2005
Posts: 425
Likes: 0
From: odessa TX
sorry to hear your troubles....
what code is setting?
does it get hot and then kick the light?
ive seen a lot of cars with plugged trans coolers...
have them make sure they get suff. flow...
i removed my stock radiator and installed a alum. one and then installed a external cooler with a fan...
but i also have a 3600rpm stall......
but have still seen many plugged coolers.
hope that helps..
udriveslow
what code is setting?
does it get hot and then kick the light?
ive seen a lot of cars with plugged trans coolers...
have them make sure they get suff. flow...
i removed my stock radiator and installed a alum. one and then installed a external cooler with a fan...
but i also have a 3600rpm stall......
but have still seen many plugged coolers.
hope that helps..
udriveslow
Drifting
Joined: Nov 2005
Posts: 1,629
Likes: 3
From: Edmond OK
sounds like the P1870 code. The 4L60E's were extremely bad about this in their early years, I would have figured they would have fixed it by now, however I could be wrong. I've had 2 vehicles with the 4L60E and Both did this. It's caused by a valve in the valvebody that is too short and gets stuck in it's bore due to twisting. TransGo Makes a fix for this, it requires pulling the valvebody and installing it. I'm sure GM has a fix for it as well and you're probably still under warranty.. so I'd suggest this to the service manager. Maybe they can find the TSB for it.
