1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

2003 Chevy Silverado

Post in 'DIY and General non-hearth advice' started by Gary_602z, Mar 2, 2013.

  1. Gary_602z

    Gary_602z Minister of Fire

    Joined:
    Oct 30, 2009
    Messages:
    930
    Loc:
    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

    Helpful Sponsor Ads!





  2. greg13

    greg13 Feeling the Heat

    Joined:
    Jan 5, 2012
    Messages:
    446
    Loc:
    CNY
    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.
  3. Gary_602z

    Gary_602z Minister of Fire

    Joined:
    Oct 30, 2009
    Messages:
    930
    Loc:
    Lake Odessa,MI
    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
  4. begreen

    begreen Mooderator Staff Member

    Joined:
    Nov 18, 2005
    Messages:
    46,010
    Loc:
    South Puget Sound, WA
    Definitely review the wiring and connections. A bad ground can cause very odd behaviors sometimes.

Share This Page