[SOLVED] OBD II connector not working - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 05-17-2010, 09:09 PM
Catfish_SS's Avatar
Catfish_SS Catfish_SS is offline
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2005 Chevy TrailBlazer LS
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OBD II connector not working

ok. Check engine light came on so I borrowed my brothers scan tool and the thing would not power itself thru the OBD II port and not link up to the car. Works fine for his maxima and his friends accord so I know its not the tool.

I also went to Auto Zone thinking it was his tool but the Autozone guys crap would not connect either.

Also it seems If I jiggle the key it'll power on but only for a split second. I say it seems cuz it looks totally random. Sometimes i jiggle and get life......others, i get nothing so I dont know if I'm crazy or what.

The fat auto zone dude that I reckon knows crap 'bout cars said my computer is bad. Then I told him bout the ignition switch he said "could be that too".

It seems the ignition switch would be a culprit since I had some similar issues with a Jetta I had and it was the switch.

Please help!!!!
Am I the only one with this problem? I still have to look at the connectors under the dash and make sure they are all tight.

I think i have a mis-fire cuz the truck idles like crap and is drinking gas like its 50 cents a gallon.

Wife started a new job far so had to get a dollar menu dinner today and save money for gas for the week for her.
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  #2  
Old 05-17-2010, 09:14 PM
Copper93 Copper93 is offline
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The ignition switch is a common problem. When the switch goes bad it causes all sorts of random issues. Its a cheap, easy fix. Change the switch and you might see your other issue go away.
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  #3  
Old 05-17-2010, 09:26 PM
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Catfish_SS Catfish_SS is offline
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Rock auto has it for like $25. Process of elimination starting with the cheapest thing first.
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Old 05-17-2010, 09:42 PM
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MAY03LT MAY03LT is offline
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Cheapest thing first is to check the cig lighter fuse in the fuse block under the hood. That circuit is also the B+ lead found in the obd2 connector.

edit - thought you had an SS, not sure if its the same for the regular tbs
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Old 05-17-2010, 09:46 PM
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I def agree its the cig fuse, same thing happened to me.
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  #6  
Old 05-18-2010, 07:56 AM
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Wish I had an SS. ScreenName is confusing i see. Anyway......good lookin guys. I'm gonna check that out right now before wifey goes to work.
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  #7  
Old 05-18-2010, 08:10 AM
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christo829 christo829 is offline
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If it wasn't for it working intermittently when you jiggle the key, I'd say fuse.
That intermittent action sounds more like the ignition switch, as mentioned
already.

That being said, it won't cost you anything to check the fuse. Some members
here have had problems with loose fuse block connections, though jiggling
the ignition wouldn't affect that.

As far as the gas mileage, how many miles on your truck? Ever cleaned the
throttle body? Cleaning itself may not do much for mpg from a strictly
mechanical point of view, but the improvement in driveablility/response can
result in better overall mpg.

Good Luck!

Chris
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  #8  
Old 05-18-2010, 08:14 AM
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Catfish_SS Catfish_SS is offline
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That was it guys. 20 amp midi fuse blown. I think it was #13 in the fuse box under the hood.

Later I'll get another fuse at autozone and go back to the same guy that said my computer was fried. Clown.

I owe ya'll a few beers.

Yeah....the jiggling threw me for a loop. Like i said "it seemed" to be that. I knew i was just going nuts. Wierd coincidence.
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  #9  
Old 05-18-2010, 11:26 AM
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the roadie the roadie is offline
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And now you know why certified mechanics work in shops fixing vehicles and parts store counter staff work in parts stores selling parts. And why they read codes for free.
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Old 05-18-2010, 07:06 PM
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MAY03LT MAY03LT is offline
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Quote:
Originally Posted by Catfish_SS View Post
That was it guys. 20 amp midi fuse blown.
Thanks for the follow up.
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