No power on the odb2 port?

JHARE213

MEMBER
2008 CHEVROLET SILVERADO
V8
2WD
AUTOMATIC
188,000 MILES

As the subject says the odb2 port is not supplying power to my scanner. I looked at the fuses inside the cab but didn't see one that appeared to be blown. Not sure which fuse I need to look at, and the maps in the fuse panels in the cab and in the engine bay were not very helpful.

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AL514

MECHANIC
4,793 POSTS

Hello, what size engine do you have, and is this a 1500, 2500, 3500 series?
There's a couple of different fuses depending on gas or diesel engine, and whether it's a 6.6liter or different size. The gas engine is in the under-hood fuse panel and looks to be the LTR (20amp) fuse #53. On the diesel engine it's still the LTR (20amp) but labelled as fuse #50.
So, it will be either Fuse 50 or 53 LTR 20amp, on the gas engine Fuse #50 is Rear Defog 30amp. So, you will be able to tell by the amperage of the Fuse and hopefully the fuse box has labels on it. Check both sides of the fuse with a test light. Pins 4 and 5 should be Grounds. I'll post a diagram of the Data Link Connector, what scan tool are you using?
And are you missing power to any other areas?

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

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

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Sunday, June 18th, 2023 AT 1:26 PM

JHARE213

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42 POSTS

Sorry for the late reply, it is a 1500 with a 5.3L V8 Gas Engine.

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Sunday, June 18th, 2023 AT 7:21 PM

JHARE213

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My wife said the driver side power plug (cigarette type) doesn't seem to work anymore. Other than that, I don't know of any other issues. The scanner I am using is a Foxwell NT301. I checked the data link connector with a multimeter to confirm that it wasn't getting power.

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Sunday, June 18th, 2023 AT 7:25 PM

AL514

MECHANIC
4,793 POSTS

That's interesting you mention the other power outlet, the LTR Fuse 53 20amp powers up pin 16 of the Data Link Connector and also that Accessory power outlet. You can see it in the diagram below. So, I would check that fuse and see if it looks like it either got hot, is blown, or possibly if there is any corrosion in the location where the fuse sits.

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Sunday, June 18th, 2023 AT 8:18 PM

JHARE213

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42 POSTS

Thanks, we will check it first thing in the morning. That outlet seemed to stop working when our Great Dane stepped on the phone charger that was sticking out of it and broke the charger in half.