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Questions and Answers

OBD-II Port Not Working?

Q. Vincent, I have a 1998 Chevrolet S-10, 2.2 liter 4-cylinder, manual transmission and I am having trouble finding out why my OBD-II port is apparently "not working". I have had two different OBD-II Actron scanners hooked up to the port, and none of them are able to pull a code, or even turn on. (The key is in put in the position right before it cranks).

OBD-II Port Not Working?

This has been attempted by ASE certified mechanics with different OBD-II scanners. Here's the odd thing: The codes will pull up when a dealer, and even an emissions station hooked them up to whatever computer they were using.

At first, I assumed that the person trying to pull the codes the first time didn't exactly know how to use the diagnostic scanner, but after this second attempt (with the Actron) and no luck, I'm becoming concerned.

I recently e-mailed a tech at Sunpro, and he mentioned that it was a wiring problem, and to check pins 4 and 16 to make sure they are getting 8 volts. If this is a problem, then how do I go about locating the cause of the problem?

The vehicle has never been in an accident. Do you have any clue as to why this would be happening, or what would cause the "dead" port? I was told that there is no other way to pull the codes other than through the OBD-II port. Please advise.


A. Some scanners are not able to communicate with GM cars. The scanner you are using must be one of these that are incompatible. If the GM Tech-2 works, that is all I would worry about.

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