I have seen obdII dongles , like the ones you can get from insurance companies that you plug into the odbII port of your vehicle , set all kinds of communication codes. This is just an fyi in case you are using something like that. We service a fleet of Fords with GPS tracking units that are hooked up to the obdII plug and they constantly set codes caused by that unit. Have also diagnosed one that was caused by the progressive insurance dongle.
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