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May be a stupid question, but have you gone over all your wiring between pedal/tac/tb? A "circuit" code usually points to a hardware issue, in my experience.

Usually just lurk and study, but I'm getting burnt out, so, I'll TRY and make this short.

Truck has a P59 controller, currently on 12587811 OS (converted to 3 bar), and everything plays nice. I...

Did you use "Write Entire"? I've had issues with OS# causing DBW issues.

First suggestion would be to enable DTCs surrounding the Flex Fuel sensor. It may be "failing", and reverting back to the 38% alcohol content you have set. You could possibly try changing the default...

Can't say with any confidence whether or not a segment swap would work, instead of a full write. I basically did the extremes on either side of that option, with the "Write Entire" being successful....

I took care of any and all bugs I could find before I started or drove my truck. However, limp mode or reduced engine power (REP) mode seems to be the typical outcome of mismatched TPS and pedal...

UPDATE!

So, I got my replacement ECM (same service #, etc.). This one was from an '03 Avalanche, but in stock form, I still had the pedal travel issue.

I decided to give the '06 OS another...

The TAC module and gas pedal were purchased together, along with the harness between them. I assume they were from the same vehicle, as they were advertised as such. The gas pedal is definitely a...

Another thought... I'm not sure if the Tahoe that my motor/ecu came from had adjustable pedals or not. I'm not sure if it would cause an issue that I'm using a fixed pedal now.

Thanks for the responses.

I purchased the TAC and pedal as a set, but seperately from the engine/ecu. It is a fixed metal pedal, with TAC module #12573059. As far as I can tell, this is the...

UPDATE! Read post #10 for my solution.

First time using HPTuners, and everything has been going great, so far. Was able to get my 2003 5.3 L59, using a P59 ECM, all set up to run a 4l80e, dual...