Hello all. Went to autozone to have codes checked and computer cleared. No signal to the hand held reader. Autozone employee says there is a fuse that may be bad not allowing the computer to give information to the reader. Or, he said the whole computer may be bad.

When starting the truck, the service light comes on with all the other lights.

I have a Hayes manual but it doesn't really say which one or under hood or in dash.

Any one else hear of this? Thanks.