Onboard diagnostics plug not connecting to tool?

2005 GMC ENVOY
182,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
CHRIS DAKE
  • MEMBER
  • 27 POSTS
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.
Jul 11, 2024 at 7:38 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jul 11, 2024 at 9:21 PM
Avatar
CHRIS DAKE
  • MEMBER
  • 27 POSTS
Blown fuse was the issue. Thanks guys.
Jul 12, 2024 at 6:40 PM
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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
Jul 12, 2024 at 7:41 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.