Emission Problem: No power to the Test plug. Operating manual with truck does not show what fuse may feed the test plug. No indication in the manual why there would be no power to this plug. Cleared o
What year is your Silverado? -Jim
If your scan tool won't read the computer and gives you an "error" message it's because of newer software that was installed at the factory. It's called "CAN". I've read that this software became mandatory beginning 2008 but GM has been using it as early as 2006 on some vehicles. It's too fast for some scan tools to read. If this is not your problem check the underhood fuse box. Look for fuses labeled PCM 1, PCM B, and 4 WS. HTH. -Jim
Js08016 led me in the correct direction, but all those fuses that he mentions were good. I found the fuse for the cigarette lighter was blown open. I replace it and measured power to the test connector then my truck passed the emissions test. Who would have thought? Problem solved.
Awesome, glad to help and you're on the road again! Thanks for letting us know. -Jim
I have the same problem but all my fuses are good. Is there any other problem it could be.?
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