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Have put a new pedal on it and throttle body so eliminated those. Throwing a code for TPS. I am currently thinking its a tune problem, but we will see.

Wait until I get it running, cause I'm really going to take out my frustrations on that LS2!!!!
 

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Have put a new pedal on it and throttle body so eliminated those. Throwing a code for TPS. I am currently thinking its a tune problem, but we will see.

Wait until I get it running, cause I'm really going to take out my frustrations on that LS2!!!!
where did the motor come from? what computer? what wiring harness? what tuning? what trans are you running? If it has any kind of stock computer you drive by wire system wont work with a tps code.. can you get scan data?
 

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2006 Trailblazer SS motor, 2006 Impala computer with 2006 GTO tune modified with HP tuners, Turbo 350 but full manual and not set up in computer. Trailblazer SS DDBW pedal. Code I am getting is p2138 and the gas pedal is doing nothing. I am at the point that I'm pretty sure something in the computer is toast. Tried new pedal and new throttlebody.
 

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2006 Trailblazer SS motor, 2006 Impala computer with 2006 GTO tune modified with HP tuners, Turbo 350 but full manual and not set up in computer. Trailblazer SS DDBW pedal. Code I am getting is p2138 and the gas pedal is doing nothing. I am at the point that I'm pretty sure something in the computer is toast. Tried new pedal and new throttlebody.
I don't have a trailblazer manual handy but the generic P2138 code is "P2138 Throttle/Pedal Position Sensor/Switch "D" / "E" Voltage Correlation". Thats a wiring or pedal problem. The computer won't recognize the pedal until it's fixed. Since you've swapped out pedals I'd assume a wiring problem. We tore through that harness pretty well so I'm a bit confused. We should take another look at the pinout for the pedal harness and see if a wire is switched (we messed around with that stuff a lot).
 

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I have gone through the locations of the harness pins repeatedly and it is fine. Last night even checked the resistance per the DTC for the p 2138 I found on ls2.com and that is fine. Only thing it can be now is in the computer.
 

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2006 Trailblazer SS motor, 2006 Impala computer with 2006 GTO tune modified with HP tuners, Turbo 350 but full manual and not set up in computer. Trailblazer SS DDBW pedal. Code I am getting is p2138 and the gas pedal is doing nothing. I am at the point that I'm pretty sure something in the computer is toast. Tried new pedal and new throttlebody.
There is most of your problem, you have an apportion of mix matched parts.. newier drive by wire shit is extreamly picky when it comes to matching computer tunes, ecu's and sensor data... I doubt your computer is ****ed..Can you get data from the computer?? If you can you need to read your APP sensors there should be 3 of them.. and read them in corrolation to your TPS sensor voltages...there should be 2 of them... sometimes data streams will only shop tps % thats not what you want..
 

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No bent connectors. Have researched and the 2006 GTO and 2006 Trailblazer show essentiall the same wiring in regards to the pedal set up. 2 app sensors and 2 TPS. The app sensors read as they should with one starting at low volatage and going up and the other starting high and going down.

Two things I see. One, is when reading the voltage on app sensor 2 with a voltage meter that graphs there is what looks like interference under the voltage line. I.e. solid line at 3.84 V with grey vertical lines and bars underneath. I this is coming directly out of the computer.

Secondly, I don't know if this is how it is suppose to work, but one TPS starts at 21% and the other starts at 0 % when the pedal is in the unpushed position, as you push it the second one catches up until they are both equal at 99%.

FYI, I have swapped the pedal for a new on already.
 

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No bent connectors. Have researched and the 2006 GTO and 2006 Trailblazer show essentiall the same wiring in regards to the pedal set up. 2 app sensors and 2 TPS. The app sensors read as they should with one starting at low volatage and going up and the other starting high and going down.

Two things I see. One, is when reading the voltage on app sensor 2 with a voltage meter that graphs there is what looks like interference under the voltage line. I.e. solid line at 3.84 V with grey vertical lines and bars underneath. I this is coming directly out of the computer.

Secondly, I don't know if this is how it is suppose to work, but one TPS starts at 21% and the other starts at 0 % when the pedal is in the unpushed position, as you push it the second one catches up until they are both equal at 99%.

FYI, I have swapped the pedal for a new on already.
Since you are throwing a TPS corrolation code I wouldn't worry to much about what you see with the APP.. The computer isn't working the throttle because it sees a problem with the tps circuits not the app circuits... how were the app voltage readings taken??

The TPS readings was that from the computer with a scan tool plugged in??? it looks like you need to do pin out voltage tests on the tps circuits... one tps starting at 21% and the other at 0% itsn't right...
 
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