GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 5 of 5
  1. #1

    Default OBD-II port not working

    Hey guys, I have a 2001 Silvy that keeps tripping the CEL every time I fill up. It's a problem with the fuel canister purge valve. I have been using my code reader to reset the light, but now the reader wont power on or self test when plugged into the port. I tried the reader in other vehicles and it seems to work fine, so I'm thinking it may be the port itself.
    I have checked for loose wiring and such.
    Anyone have any insights on this?
    Thanks in advance for any help!

  2. #2
    Jr. Engineer Gmcsuvguy's Avatar
    Join Date
    Dec 2007
    Alberta, Canada


    There is a fuse for it... I can't remember which one it is in the fuse box right now...
    Ken Beida
    2010 GMC Sierra Crew Cab 4X4, 5.3L
    2009 GMC Sierra Denali, 6.2L = 403hp, AWD, Full load

  3. #3


    Thanks for the reply! I thought it may be a fuse issue, but the manual doesn't list a fuse for it specifically. Guess it's time to check each one individually.
    Thanks again

  4. #4


    I know on a Katrina truck, the OBD-II port didn't work because the power wire in the connector corroded to hell and didn't have a connection anymore. No power equals no OBD worky...

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  5. #5


    check the cig ltr fuse.

Similar Threads

  1. Replies: 7
    Last: 12-20-2010, 01:20 PM
  2. OBD II Port
    By beakerss in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 7
    Last: 11-21-2010, 01:05 PM
  3. USB Port
    By mus99gt in forum Audio, Video & Gadget Tech
    Replies: 7
    Last: 06-13-2010, 03:39 PM
  4. USB port
    By Elefntkpr in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 2
    Last: 04-11-2010, 12:16 AM
  5. Replies: 5
    Last: 09-12-2009, 06:23 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts