Where is the Fuse for On-Board Diagnostic (OBD) located?

KSAUTOHELP22

MEMBER
2005 GMC ENVOY
6 CYL
4WD
AUTOMATIC
171,000 MILES

Engine light came on and attempted to have the code read. The code reader did not light up and was told the fuse was probably out. The car manual doesn't specifically say where this fuse is.

Friday, September 16th, 2022 AT 4:59 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,262 POSTS

Hi,

The power supply to the DLC is provided by the cigarette lighter fuse in the under-hood fuse box. It's fuse 13 and is a 20-amp fuse.

If you look at pic 1 below, I provided the wiring schematic of the DLC and highlighted the fuse that sends power to pin 16,

When you check the fuse, make sure it is good. Also, make sure there is power to and from it.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know if this helps or if you have other questions.

Take care,

Joe

See pic below. Pic 2 shows the fuse location.

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Friday, September 16th, 2022 AT 10:01 PM

KSAUTOHELP22

MEMBER
2 POSTS

I apologize for taking so long to respond. This worked and helped me very much.

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Thursday, September 22nd, 2022 AT 12:11 AM

JACOBANDNICKOLAS

MECHANIC
108,262 POSTS

Hi,

No problem whatsoever. I'm glad to know it helped. Please feel free to come back anytime in the future or if you have questions. You are always welcome here.

Take care and thanks for the update.

Joe

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Thursday, September 22nd, 2022 AT 7:25 PM