Ok, Check this out--Monday I changed out my accelerator pedal position sensor- on 2005 Chevrolet Silverado 1500

engine light was on and that is the code it threw so I replaced the part. Light goes off-truck screams down the road. Yesterday afternoon get in the truck drive about 5 miles light comes back on so I pull over hook up my Actron and it gives me the same damn code-Accelerator pedal position sensor. So I get under the hood, jig and shake everything, fire it up, light still on. About 5 miles down the road light goes off and hasn't come back on since. What the heck? What's your opinion? This is driving me nuts.

by in Houston, TX on April 10, 2013
3 answers 13 comments
ANSWER by on April 10, 2013
Likey you are having intermitant issue with fly by wire thottle controls. Common problem is the thottle actuator is failing...but thats just a gusss as you did not mention the code you are getting.
COMMENT by on April 10, 2013
p1125 and p1516 where is the throttle actuator control module located on my vehicle? where the manual says its located it is not. Thanks another code p2135
COMMENT by on April 10, 2013
Do you have a power loss...lack of acceleration at times? Most of these I have seen end up being a thottle actuator replacement. Here are a couple of things to check. Check ground wire located behind the right cylinder head (passenger side) just below the head and mounted into the block. Inspect the Yellow Throttle Actuator Control (TAC) motor control circuit about 1 inch to 4 inches from the throttle body connector to see if it is broken inside of the insulation. Is your truck a 5.3 liter...Flex fuel?
COMMENT by on April 10, 2013
5.3 liter t series gas
COMMENT by on April 10, 2013
Module is a box on fire wall according to manual...never had to replace one...
COMMENT by on April 10, 2013
ok thanks for your help. we will check the wiring and such as you suggested. you may be hearing back from me. And yes, the message center on the dash says "low engine power" the truck will surge nearly die and the check engine light comes on. Then in a few minutes after restarting it seems normal. When this first started the obdII told me to replace the APP so I did and I'm still getting the same code.
COMMENT by on April 10, 2013
Code is due to a faulty signal between thottle actuator and pedal sensor values do not match. You can try cleaning thottle body plates if they look drty in case it could be sticking or binding and try that first before buying another part.
ANSWER by on April 10, 2013
agree with #1 or do you have 2 sensors. tps 1 and 2 poss the issues
COMMENT by on April 10, 2013
as far as I know I only have one accelerator position sensor. how would I determine if I have two?
COMMENT by on April 10, 2013
there is a throttle position sensor and a accerator position sensor that work together,maybe thats the issue
COMMENT by on April 10, 2013
Ok it was my understanding that later models just had an APP, I'll check the TPS. Thanks
COMMENT by on April 10, 2013
yw
COMMENT by on April 10, 2013
is there a way to test the TPS?
ANSWER by on April 11, 2013
APP- did you replace part(s) under the hood or parts at your accelerator pedal? I don't really know how Chevy has theirs set up , but Hondas' drive-by-wire has redundant sensors on both the pedal(APP1 & APP2) , and on the throttle body TPS1 &TPS2. Need scanner that can read 'live data'.
COMMENT by on April 11, 2013
Changed part on accelerator pedal inside truck
COMMENT by on April 14, 2013
Well , sounds like you are in the right area , as far as parts are concerned , still recommend a scanner with 'live data' capabilities for accurate diagnosis. Along with the scanner , you need CORRECT info , as to what the specific 'values' of each sensor should be! Good luck.