Jeep Garage  - Jeep Forum banner

New member, TCM issues Please HELP

13981 Views 11 Replies 7 Participants Last post by  Benibiker
About a month ago my wife's 2006 Grand Cherokee Laredo v6, 3.7L, RWD decided to go haywire. It will not shift out of 1st gear (limp mode) even after several restarts. Check engine light, ESP/BAS, and Traction Control lights are all on. Dealership checked it out and said that it needed a new TCM. I was told that the TCM was part of the PCM in my model and year. Bought new PCM (programmed and updated) and installed it, still same exact problems as above. The two codes it is spitting out are p0605 and u0101. Guess my first question would be is the TCM and PCM the same part for my make and model (I've heard yes and no) and does anybody have any other suggestions? Any help is greatly appreciated. Thanks
1 - 2 of 12 Posts
The 3.7 uses the NAG1 transmission. The TCM is a separate item from the PCM. Don't know where it is on the WK, but on my Hemi LX, with the NAG1, it's under the dash by the steering column. Did you keep the original PCM? If so, you can either keep it as a spare, or try to sell it on Ebay or on one of these forums. Be aware that the U0101 code means communication has been lost to the TCM. First thing to do is to find it and check all the connections to it. I'd unplug, inspect, clean and reinstall. Disconnect the battery before you do this though. One other lesson probably learned here is to not to take it to the dealer, except as a last resort.....especially if it's not under warranty. IMO, come to the forums first. So many dealers are just parts replacers and don't really know these vehicles as well as the folks that drive and repair them without dealer help. I know that every time I've reluctantly (and rarely) taken mine to the dealer, I've had to tell them what to do. Good luck, and let us know what you come up with.
See less See more
That's a good one!!! I am not sure, but I would think (without looking it up) that the TCM doesn't have anything to do with whether it's 2 or 4 WD, or know the difference. Maybe someone with more knowledge of any possible interactions could elaborate.
1 - 2 of 12 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.