72 nova dbw 2006 lq9 with code u0107 help !!!!

[Shauner]

I am posting this with hopes someone has seen this problem as I have tried almost everything to no prevail.

2006 LQ9 6.0L engine and 4L80E that is DBW with TAC module setup. I have installed a brand new wiring harness for my 72 Nova conversion with the engine,PCM and TAC module from the same escalade. The pedal I have from a 2003 corvette which has the same language in the pedal as my TAC module and PCM. The problem is when pressing the pedal I get U0107 code. If I slam the pedal to the floor and hold it then it works beautiful until i slightly move my foot off and BAM i get the U0107 code. REPLACED THROTTLE BODY,TAC MODULE AND PEDAL and same problem happens exactly. Car has more grounds that I know what to do with as well.

Would loading a tune file onto the PCM corrupt anything that would cause this issue? as it's not a hardware problem. should I try to write full instead of write calibrate ??? would that help ???

looking for anyone to help me please!
Tks,
Shaun

[Chrome_Rust]

just for sake of argument, have you tried the pedal from the escalade? While it may work and provide the correct signals/wires the voltage values that the pedal is sending to the TAC may be slightly off from what the escalade TAC wants to see.

[Montecarlodrag]

I have had that problem. You have a mismatched TAC or PCM operating system.
Truck TAC and pedals are the same from 03 to 05, they changed for 06-07. If you use a 06-07 operating system with a 03-05 TAC it will lose communication and go limp mode. The same happend when you do the opposite.
Check part number of the TAC, I bet you have the wrong one. The good thing is you can write entire a 05 OS to fix the U code

[Shauner]

this sounds promising.... so let me lay out what i have....
2006 escalade engine and TB,2006 tac module,2006 escalade PCM, 2003 vette pedal (due to size issues)..... I then plugged in an 06 silverado pedal (plastic) and TAC module to get the same result as I thought my pedal was wrong.

Could you give me some more insight on how do I get or write an 05 OS to fix the U code and then do I need to find a truck TAC and pedal from an 05 to go with this re writing of an 05 OS ???

[Montecarlodrag]

05 truck pedal is metallic so you can cut and weld it to fit, we have used it in a few 69-75 Novas with good results. Just be careful not to heat the sensor when welding.
Find a matched 05 TAC and pedal, then flash a 05 file of the same family you got the pedal/TAC from. It should work and wiring is the same