2003 Chevy Silverado

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Gary_602z

Minister of Fire
Hearth Supporter
Oct 30, 2009
929
Lake Odessa,MI
I posted this on ChevyTalk but I thought what the heck I will try it here also!

Gary

Okay, Picked this truck up for a song and dance that will drive fine for about 5-10 miles and then goes into reduced power mode. If you clear the codes or disconnect the battery for a second it will fire right back up and run fine for about the same amount of time before it repeats.
It is throwing codesP2135,P0120,P0220,P0 1516 and P0134.
After researching it and reading about the wiring at the throttle body and engine grounds it is still doing the same thing.

The APP and the throttle body read different at idle (APP at 0 and TB at 3 degrees)and increase in difference as you accell. Should they read the same?
Could the O2 sensor code bank 1 sensor1 be causing it to go to REP?

The previous owner had put on a new APP and Throttle body from AutoZone (which I am not a great fan of).

Any body had any other fixes or have any idea?
Thanks in Advance!

Gary
5.3 motor
Don't worry what other people think....as most of them don't! http://www.pbase.com/gary_602z
 
GM is a great fan of using Modules to control everything. Looking through the codes it looks like most of the codes originate from the the throttle control module area. P0120 is throttle switch circuit A, P0220 is peddle switch circuit B, P1515 is throttle Module. They seem like they may all be related resulting in the P2135 reduced power code. P0134 code shows an O2 sensor no activity Bank 1 sensor 1. I would take a very close look at all the wiring and connectors, one bad connection can effect everything downstream. I don't think I would waste a lot of time on it, but find a GOOD mechanic that knows how to do diagnostics. Trust me it's an art that requires a lot of training. I've been pulling wrenches for almost 40 years and if you are not up on this (I'm NOT) you can loose a lot of hair in a hurry!! It's best to start with the OLDEST code first when it comes to repairs, Like I said one can effect the others.
 
Thanks Greg. Going to do the O2 sensor and see if it takes care of it. The hard part is finding a good diagnostic mechanic! My buddy is one of the best pure mechanics that I have seen,but his diagnostic and electrical skills are way down on the scale.

Gary
 
Definitely review the wiring and connections. A bad ground can cause very odd behaviors sometimes.
 
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