Truck wont shift and getting a U0100

[heathgu]

Yeah cougar,
thanks for the advise again. I will see what i can find. The truck has gone to my mates who is a auto sparky. See what he come up with this afternoon.

Cheers and thanks heap Heath.

[heathgu]

Hey cougar,

I have check everthing twice and i am pulling my hair out.

Could it be something like the tcm and the ecm are not from the same vehicle. Would this cause the break down in communications??

I have no more ideas.

Cheers Heath

[Cougar281]

Shouldn't, unless they changed something for the newer controllers. I had a TCM from a 2003 8100 in my truck at one time and it worked normally, except for the weird shifts. No codes, though. Did you change the VIN(s) so they all match?

E-mail me a list of the codes if you can.

[petestoy]

I have a similiar problem on a 2006 sets P0700 and U0100. reset the codes and its fine for about two weeks. Checked power and grounds at the TCM found the Transmission connector at the back of the tranny not seated it would move back and forth a little contact cleaner on all connections. The code won't clear it self from what i read so you would have to clear it manually. Mine comes on right after start. is yours similiar? Does it put tranny into limp mode?

[Cougar281]

I have a similiar problem on a 2006 sets P0700 and U0100. reset the codes and its fine for about two weeks. Checked power and grounds at the TCM found the Transmission connector at the back of the tranny not seated it would move back and forth a little contact cleaner on all connections. The code won't clear it self from what i read so you would have to clear it manually. Mine comes on right after start. is yours similiar? Does it put tranny into limp mode?

Heath's problem was a bad TCM. He also had a LOT more codes than P0700 (TCM Request MIL) and U0100 (Lost Comm With ECM/PCM A). Are those the only codes you get?

[petestoy]

That is what the dealer told me two weekes ago. the mil light came back on and its responding the same way. I ordered EFI Live on Wednesday and have not recieved it yet to verify.