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Potential Tuner
0x7E9: U0100 - Lost Communication With ECM/PCM A (Permanent)
why do i only see this in hp tuners no check engine light. Is this an issue with software?
car seen to run fine.
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Potential Tuner
re flashed with stock tune code went away. its just weird that the check engine light did not come on..
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HPT Employee
The U0100 code is common after a re-flash. The reason it did not trip the light is because the code is Permanent and not Current/Pending. More information on Permanent DTCs can be found here:
http://www.hptuners.com/forum/showth...nd-VCM-Scanner