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#1
06-09-2013, 12:18 AM
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03 LT EXT OBDII Not working
I have a 03 that my check engine light came on when the engine started running alittle rough, like idling @ 900 its spuddering, when speeding up, the light flashes, then let off and coast, the light goes solid, so I hooked up my scan reader and.....nothing, wouldnt even come on.
So I hooked it up to my wifes car and it came on just fine and told me no codes present, so tried agin on Trailblazer and again....nothing. Any ideas??? I need the codes so I can figure out whats wrong with it.
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03 Chevy Trailblazer LT EXT 04 Silverado Z71 88 Fiero Formula V-6 82 Chevy Corvette 07 Dodge Caliber 
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#2
06-09-2013, 06:45 AM
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Re: 03 LT EXT OBDII Not working
Well, it's obvious a P0300 is set here......when a misfire is so bad, that it could harm the cat, the CE light will flash.....when you ease up on the gas, and the misfire lessens , the light goes out....
What kind of code reader do you have? Some can't read a system if it is a CAN run system.....Did it ever work on this vehicle before? What vehicle does your wife drive? Places like autoZone will read the code for free.... But I think your main problem is a bad misfire,,,,,,could be secondary ignition or an injector problem....
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#3
02-02-2014, 03:10 PM
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Re: 03 LT EXT OBDII Not working
I hate to comment on an older post but if anyone else is having this problem too my wife's 06 trailblazer had the same problem hooking up a code reader. There was a blown fuse for the cigarette lighter outlet which apparently powers the OBDII as well. It's a 20 amp fuse if I remember correctly and it's in the fuse panel under the hood. Popped a new one in because the one that was in there was bad and presto the code reader worked just fine.
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