truck is a 2001 C3 6.0L 4L65e.
I am having a problem with the ETC. If the TPS reaches 85-90% the reduced engine power mode is triggered and code p1518 sets. Throttle works normally unless over 85-90% throttle is requested. I can make this code set with just the key on and the engine not running. This makes me think the problem lies with the TAC not the MAF or related.
The root of this problem I'm sure is that this is a 2001 DBW truck that is running with a 2003 DBW throttle body and TAC. The pedals are the same. I have tried swapping pedals and TACs from running trucks with the same results. Could there be something in the tune 2001 DBW vs. 2003 DBW that would cause this?
This truck has a mild tune, and I reverted it back to stock with the same results.
Any ideas?
I guess I should try swapping throttle bodies as well.