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Old 05-31-2013, 02:14 PM   #1
Drives: Camaro
Join Date: Feb 2011
Location: NY
Posts: 154
CEL with code P2176

Hey guys, i could use a little bit of help here.

I got a check engine light a couple days ago, so i looked up common causes and tried doing some fixes, i tightened my gas cap properly, filled up with fuel injector cleaner and 93 oct at BP and still it stayed on. So i went to autozone today and they gave me the error code

Error Code: p2176

Sensor 1 and APP sensor 2 signal voltage fault
The ECM has detected the APP sensor signal 1 and 2 do not agree
Probable cause
1. Poor electrical connection
2. Failed APP sensor

So i did bit of search there is not too much on this code that i could find, but what i did find seemed to point to throttle body issues, sludge build up on it and etc. Forum member recommended just cleaning it properly.

I will be trying that this weekend but i would appreciate any additional advise and help to this matter

Thank You

Edit: i forgot to mention i have installed a ported TB since Early last month.

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Old 06-01-2013, 01:24 PM   #2
Drives: Camaro
Join Date: Feb 2011
Location: NY
Posts: 154
Bump guys, anyone?
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Old 02-09-2014, 12:49 PM   #3
BudMC77's Avatar
Drives: 2011 Camaro 1LT
Join Date: Jun 2010
Location: Kentucky
Posts: 207
Bump bump.

Got the same code coming up on mine as well.
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Old 02-09-2014, 01:05 PM   #4
BlackoutLFX's Avatar
Drives: 2012, Black 2LS
Join Date: Jun 2013
Location: Alabama
Posts: 490
The P2176 code is set when the difference between the predicted and the actual throttle position is more than a calibrated amount for more than 1.5 seconds.
Possible Causes.

Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection
- Throttle plate sticking due to carbon build-up
- Engine Control Module

The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. The TAC system uses the following circuits for Motor control 1 and Motor control 2.

Two processors are also used to monitor the TAC system data. Both processors are located within the ECM. Both processors monitor each other's data to verify that the indicated throttle position is correct.

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Old 02-09-2014, 08:24 PM   #5
c_cook94's Avatar
Drives: 2011 Rally Yellow 1LT
Join Date: Nov 2011
Location: Vicksburg, MS
Posts: 183
I had this problem last summer with mine. I ended up getting a whole new TB
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