Code U3FFF

kheran said:

Hey guys, I've been away a while. Need some input on my son's 2017 Prime. It threw a code U3FFF (found via scanguage) and tossed on the check engine light. He did get gas a couple of days ago and we did check the cap and all was good..The car "seems" to be fine...any thoughts? It may have to go to the dealer but they are backed up for a week or so....

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Code U3FFF
U codes are communication faults between the different modules present on your vehicle. The PCM has to maintain control via separate modules that monitor and control every aspect of it, from engine and emission control,transmission control, anti-lock, traction control, lighting, hvac, suspension control, etc...To diagnose these codes requires a quality scan tool and a technician who is experienced with these systems.