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Sounds good. The 13 volts from the car shouldn't affect the K line communications. The chip may clamp it down to 12, or may let it flow at 13, whichever, the car should be happy with it.
Do all the attempted PID's result in a reset of the device? (Set three PID's to a PID that you know works, then try the others. Note which work, and which causes a reset. There may be several that cause a reset.
Any 'fudged' ones that carry back any result? An error is an expected result if the the car does not wish to handle the PID request.
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