2003 chevy silverado REduce Engine Power
 

Hello guys,
I have a 2003 chevy silverado, added a supercharger and I am getting a U0107 (Lost commintication to Tac) at load, already replaced the Tac module, check voltage and I just can't seem to find the problem. Replaced the engine harness thinking that would be the problem but it wasn't. Replaced, TB aswell. Truck will turn on and idle good, when running truck won't shift by itself due to the code unless we command shift manually using the bi directional controls , gives me codes P0740 and P0785 but already check trans harness and their full voltage to solenoids, any help will be greatly appreciated. Also you guys think it can be in the tooning?

What throttle body? You tunning a x-link?

Stock tb, no x link

Post the file.

Did you buy a new TAC Module? How did you get it reprogrammed? Will another TAC Module from a similar model truck work in another truck?
I bought a new TAC Mod and didn't know it had to be programmed. Could I go get one out of the junk yard and it work in my truck?

I have an HP Tuners tuned PCM, they are telling me in order to program the new module that I will have to erase the Hot Rod data and go back to factory settings which will probably make the truck run like crap or not at all and that would not allow the new TAC Mod to program properly without it running or running like crap!

Any help here? Thanks guys

Chad

Another question, will any TAC Module work? Can I get one from a junk yard that is for a 06 (same motor w/fly by wire TB) work in my 03 (same motor w/fly by wire TB)?

Chad

No. 03-05 are similar, but 06-07 classic are their own breed. Do not interchange them.

Same with the tune file. It must match the corresponding TAC module.

So I have get an 03-05 truck FBW TAC Module and it should hook right up and go? That would be FREAKIN AWESOME if that is correct!!

Chad

What exactly is your problem ss4chad?

Yes.
Is your code specific for the tach module?

They had issues with the wires going to the throttle body plug becoming brittle and breaking. I want to say there was a TSB and when broken wire/ connections where found near or at the plug, they recomended the replacement pigtail be sliced in 4-6 inches from the original plug.