We have almost brand new Shelby F150 with Whipple system here and it goes to limp mode every now and then when accelerating from standstill. The code is P2112 "Throttle actuator A control system - stuck closed".
The limp mode barely keeps the car running which is annoying enough by itself. I logged parameters that could be logged with scanner (there was not many of them):
-Throttle position (SAE)
-Relative throttle position (SAE)
-Absolute throttle position B (SAE)
-Commanded throttle actuator (SAE)
The scanner does not seem to act very fast with this car even though I do not have many parameters along those above in read. I made many WOT pulls and I can not find a clear error from the graphs.
I attempted following:
-TP disagreement limit (original 7 degrees). I changed it to 30 and later to 90 degrees without help.
-ETC TPP THETA negative error multiplied by 4, no luck
-ETC TPP THETA positive error multiplied by 4, no luck
-I put the P2112 code to "no error reported" with no luck although this was as I expected..
This has been tested with a TB from another similar car but that didn't change anything.
Next step (if I/you don't figure out something) is to send the TB and PCM to Whipple.
Original tune and my first log attached in which the limp mode is achieved in the last WOT pull.