What follows is the diagnostic procedure on three different vehicles, with three different results.

We're going to start with a Cadillac.

Y'all may remember from my network blog that various computers on the car are networked together, and how if there are communication problems, you can have issues that you might not expect?

I can't say for certain exactly what symptoms this car presented with.

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Grab your favorite silly straw and a beverage I suppose; this one is gonna be a fun ride.

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We’ll be talking about a late-model F250 with all the bells and whistles, and there’s gonna be some inexactness regarding codes and whatnot, ‘cause I can’t remember and couldn’t be bothered to look it up, and you’ll find out why as we get into this thing.

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