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Looking for help with Code U0401

Went to the local dealer today to have them change the tire size in the PCM, 3 hours later they tell me they are having issues tracing down a U0401 (communication) code (which must be cleared before they can proceed with tire size update). Does anyone here have any insight as to what would cause this? They wanted me to leave the car with them for "possibly a couple of days", which is something I cannot do at this time.

As always, any and all help is greatly appreciated.


Frank

Edit: changed title for clarification.
 

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