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U0100 Lost Communication with ECM/PCM


Staff member
Los Angeles
its definitely not common on any car really. that code means a fault at a main part of the system.. either the brain, bcm, tcm, or a harness.

did you get /see any other codes?

did the car /has the car been acting up or behaving differently?

did you modify anything prior?

are you the only owner of this car or is it used?

have you had any other rare codes on the car before?

was the MIL/check engine lamp on? flashing or steady lit?