Gm Fault code P1616 , still no luck with P2138 .car revs up to 6000rpm , when I push the brake pedal it comes down to normal idle , P2138 is still showing up , car is still in limp home mode and no ac

seems , but can not understand that post lacking periods.
the booster is cracked and sucking vaccum to the engine
..
the brake poster is vacuum powered
but must not leak if does leak the causes and illegall air flow
to the engine main air supply and causes engines to race fast RPM at idle.
now you know why.
even the hose to it can be bad or fell off.
but i bet the booster diaphragm inside is cracked.
the service manual shows the leak down test on boosters all do
.and if it leaks it is bad.
end story.

TBW blues, THROTTLE BY WIRE
NEW PARTS FROM gm OR AFTER MARKET STUFF.
THAT IS P2 OEM FACTORY ONLY CODE.
well did you use the scan tool after all those new parts
TB and pedal
and reset all DTC then drive plenty ? to see it fail again
if yes,bad wiring. or using wrong parts.
no engine told at all
no VIN told, no RPO codes for engine. told.
lacking that it be super easy to get wrong parts, on 3 _+ engines
2,8L , 3.6, and 5.7L V8
none told. and is a pure engine EFI question
to work on any car not knowing what is there, we read the RPO tag
shows engine codes. and we buy parts only ON THAT>
all 3 TB ARE DIFFERENT.
Most of these parts have connector that lock, some are double locked, and if forced are broken.
try re-seating all TB and pedal connectors, with due care.
fully re-seated.
and wire damage.

THE SM STATES AND I QUOTE

Trouble Code: P2138 (3.6L V6 VIN 7 Auto)
Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Print this code data

Trouble Code Conditions:
The battery voltage is more than 7.0 volts. The ignition is ON or the engine is operating. DTC P2138 run continuously once the above conditions are met for more than 1 second. This DTC set when one of the following conditions occur: The ECM detects that the voltage difference between APP sensor 1 and 2 is more than 0.21 volt. The ECM detects that the voltage difference between APP sensor 1 and 2 is more than 0.27 volt with a partially pressed pedal. The ECM detects that the voltage difference between APP sensor 1 and 2 is more than 1.07 volts with a fully pressed pedal. The ECM detects that the APP sensor 1 voltage is more then 1.17 when leaving the idle range and the voltage difference between APP sensor 1 and 2 is more than 0.04. Any of the above conditions exist for less than 4 seconds.
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ALSO ARE YOU USING MODERN SCAN TOOL 2008 OR NEWER
SO YOU CAN SEE RELATED TRANSMISSION ERRORS./
p07XX Errors?

Please just google this, GM fault codes P2138, P2123

Fault code p2138 if you know it? If you don't. Google it.

One is a multiple misfire and the o2 sensor

Vacuum leak from brake booster. If you hear a sucking noise when you press the brake pedal replace it. Another way to check it is to place truck in gear set e-brake press brake pedal repeatedly and see if idle goes up and down. DO NOT PRESS GAS PEDAL DURING TEST.

If it was a fuel shortage the engine would rev but to limited speed. This is a lack of air to throttle body. Check for clogged air filter and all the piping and the throttle body.

Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

P2138 is Throttle Pedal Position Sensor/ Switch D / E Voltage Correlation. Replace the Throttle Pedal Position Sensor/Switch.Remember to have the set code Cleared from the cars computer, this will turn off the check engine light and reset it. Good Luck and have a good XMASS.

It may be the Idle Air Control is bad or carbon in the throttle body holding the Idle Ar Control.