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2008 cadillac cts 3.6 codes showing are p2176 and p0420 what does this mean

P2176 is the Throttle Actuator Control System
See the hyperlink below for info on this code:

P0420 is Catalyst System Below Efficiency (i.e. catalytic converter on the exhaust system.)
To check your catalytic converter, get a very light, small finishing nail hammer and tap the catalytic converter lightly, if you hear rattling inside it then it's shot. If your exhaust pipes are rusted through anywhere, get it all done at the same time. You can DIY using parts from Walker Muffler... schematics are available on line, get new hangers too!

Mar 21, 2015 | Cadillac Cars & Trucks

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My H3 Hummer 2006 is giving me p1516 p2176 p2135 p2176 and p2135 codes what to do so I fix it

code p 2176 refers to both the accelerator position sensor E and the throttle position sensor E--maximum stop performance ===causes --wiring---APP or TP sensor
code p 2135 refers to same items but switchF A/B- voltage correlation or implausable signal===causes --same as previous
I have no listing for a p 1516 as the book does not cover it but I am guessing that it is a specific code to hummer and still related to the problem area of the APP or TP units
if you find and fix the APP or TP problems then that code by go

Oct 19, 2014 | Hummer H3 Cars & Trucks

1 Answer

Two trouble codes p0128 and p2176

Po128 is that the engine has not reach operating temperature in a calculated time frame. Most likely cause is bad thermostat or low on coolant. P2176 is the throttle position sensor has lost its learned value. Throttle bodies with electric motor controls need to know closed position to maintain proper idle speed test sensor for proper voltage signals to power control module . This code is only tested once per ignition cycle.

Oct 31, 2013 | 2006 Chevrolet HHR

1 Answer

Code P1683 & P2176

P1683 is : Powertrain control module fault
P2176 is: Minimum Throttle Position Not Learned

Sep 21, 2013 | 2004 GMC Envoy

1 Answer

Solution for code p 2175

make sure it is a p2175, I do not see a DTC for p2175 on a 2006 chevy impala but i do for p2176 which isDTC P2176: Minimum Throttle Position Not Learned

Feb 02, 2012 | 2006 Chevrolet Impala

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I got code p2176 I changed out the tps still got same problem did not have this problem with other engine just changed engine out now cant seem to get this code off causing the car to rough idle and low...

P2176=Throttle Actuator Control System - Idle Position Not Learned
Did you use all you old sensors,or is some of them from the new engine,I would swap out the IAC sensor or check for wires not hooked up.
If it can't relearn to idle the Idle air control might be different then your old one,but its not registering with the computer

Dec 17, 2009 | 2006 Chevrolet Impala

1 Answer

P2176 code

NO , gas cap not the issue here . the P2176 refers to throttle actuator control system - idle position not learned .... the test for this is a mile long , i would try clearing the code , and see if it returns , or it will reset itself if it see's 3 drive cycles without a failure . cheers.

Jan 09, 2009 | 2004 GMC Envoy

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