OBD port not working?

Tiny
GALAXYAL8230
  • MEMBER
  • 2011 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
I can't figure out which fuse my OBD port is connected to. I've looked for a cigarette lighter fuse and every other fuse that I could even think of. Actually, I checked every 10 and 15 amp fuses but still can't seem to get my scanner to read the codes. About to check with a voltmeter to see if it's getting power but I'm sure it's not considering when I plug my scanner in I get nothing.
Friday, July 14th, 2023 AT 2:34 PM

3 Replies

Tiny
AL514
  • MECHANIC
  • 5,139 POSTS
Hello, are you getting a no communication message on the scan tool, or is it just not powering up? Also does your check engine light come on when you turn the key to the on/run position? It should last for a few seconds.
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Friday, July 14th, 2023 AT 3:07 PM
Tiny
GALAXYAL8230
  • MEMBER
  • 2 POSTS
It wasn't getting power, but I did some more research and found out it was location 53 under the hood's fuse box. It was blown so changed it and now it is reading.
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Friday, July 14th, 2023 AT 3:13 PM
Tiny
AL514
  • MECHANIC
  • 5,139 POSTS
Okay, here is the power feed for the Data link connector, if the fuse was blown, I would be sure that nothing fell into the Accessory Power outlet, which is usually the cause on GM's when pin 16 doesn't have power.
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Friday, July 14th, 2023 AT 3:16 PM

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