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Onboard diagnostics plug not connecting to tool?

Tiny
CHRIS DAKE
  • MEMBER
  • 2005 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 182,000 MILES
So, I have a friend that came by today with his vehicle listed above his OBD Plug isn't not connecting to my scan tool, same thing happened at the parts store as well.
What's the best way to troubleshoot the plug to find the issue to recover the trouble codes he needs. Any and all advice or suggestions will be greatly appreciated. I can provide Pictures and or more vehicle info if need be. Thank you guys.
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Thursday, July 11th, 2024 AT 7:38 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,253 POSTS
Hi,

First, I attached a pic below of the DLC. First, check to make sure there is battery voltage to pin 16. That should be present at all times.

If there is power, then check for continuity to ground at pins 4 and 5.

If you find there is no power to pin 16, check fuse 13 in the under-hood fuse box. That is what powers the scan tool. (See pic 2 below)

Let me know what you find.

Take care,

Joe

See pics below.
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Thursday, July 11th, 2024 AT 9:21 PM
Tiny
CHRIS DAKE
  • MEMBER
  • 20 POSTS
Blown fuse was the issue. Thanks guys.
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Friday, July 12th, 2024 AT 6:40 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,253 POSTS
Hi,

You are very welcome. That was an easy one. Thank God! LOL

Take care and feel free to come back anytime in the future.

Joe
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Friday, July 12th, 2024 AT 7:41 PM

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