cady_lac Posted April 6, 2007 Report Share Posted April 6, 2007 ive been reading alot of the topics and have encountered alot of the problems and have fixed them myself so i thought i would join to try to add some helpful information and try to just help out. but with all of my knowledge of this car i have come to something that really stumps me. i have the "bulletproof" 4T80E and i got a problem where after the trans gets to the higher range of its operating temp the car will fail to shift into first gear at a stop then after a short time of driving it will fail to shift into second as well. looking at common problems i had it taken to a trans shop they scanned the computer wile driving it and it was commanding first and second but not shifting. so i replaced the solenoids on the valve body. when i opened the pan up it was filled with metal so i still replaced them but didnt get any difference in the condition. i took it to a very good trans shop close to where i work and they drove it for two days and couldnt get the problem to happen to them but i got them to rebuild it anyway. basically every moving part in the trans and the diff had something wrong with it so now i have a new trans but driving home from the shop i lost first and second gear AGAIN!!!! now for my question anybody have any other ideas i dont have any codes that i know of but i will check in a couple mins. its going to the shop on monday to get looked at again but any help would be appretiated. Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 6, 2007 Report Share Posted April 6, 2007 Does it whine? Check for codes Explain what you mean by you lost first and second. It starts in THIRD? There is a default condition where it starts in Second. You said every moving part was damaged and they replaced all moving parts, did they show you the damaged parts? What part caused all of the debris in the tranny? Was it clutch material or did a part go bad? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
cady_lac Posted April 6, 2007 Author Report Share Posted April 6, 2007 i am aware of the second gear starts when the tcc is off and yes the car does start in third. no noises it just stays at about 2000-2800 RPM until about 50km/h when it was rebuilt the cause of all the debris was determined to be the diff and all the pieces got spread throughout the tranny causing secondary damage to alot of other parts and ya i saw the parts and i was surprised it even moved let alone shifted into ANY gears. the car has about 220,000 km on it and there was still quite a bit of clutch material left on the disks and when i replaced the solenoids it already had the update kit in it so im thinking it was already out of the car before i got it. im going out to move the car in the driveway now so ill check for codes while im there. NOTE: when they removed the tranny i dont think they un-hooked the battery so when i got home i disconnected it and let it sit for about an hour to see if the computer needed to be re-set but it didnt work. Link to comment Share on other sites More sharing options...
cady_lac Posted April 6, 2007 Author Report Share Posted April 6, 2007 i had a P0603 in history but i dont know how recent as well as a C1255 or C1253 not sure i cant remember i dont have a pen and its really cold and dark outside right now. but i didnt have any active codes and i had alot of codes in history in various locations but i havnt ever cleared my codes and i had alot of codes last time i checked them (two months ago C1232 for my left wheel speed sensor wire that touched the axle) Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 6, 2007 Report Share Posted April 6, 2007 Those codes are not related to the tranny Third and Fourth Gears Only Causes 2-3 Shift Solenoid Valve Stuck ON Pinched wire to ground Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
cady_lac Posted April 8, 2007 Author Report Share Posted April 8, 2007 i drove about 500 km this weekend and i think i jumped the gun. i think the problem was the adaptive shifting. it worked perfect all weekend. i'll keep an eye on it thanks for the help anyway. Link to comment Share on other sites More sharing options...
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