Check engine light on
2007 Chev Duramax LBZ. My check engine light came on so I have an appointment with the dealer. Took the camper off to take the truck to the dealer. Once the camper was off the check engine light we...
Forum Discussion
It is very possible that the CEL came on in response to an electrical "load" from the TC. Many of the sensors use what is called reference voltage to operate. Typically 5V±.5. Since that is provided by the truck's alternator/battery a stray surge or reduction in voltage/amperage associated with the TC could have set a code. If you are on shore power and your inverter is over/under charging the TC battery it could be the truck's "brain" seeing that change in load as a fault. From what I've seen a Duramax can set a code if that voltage drops to 4.7V so maybe you just had a parasitic draw that pulled the voltage down temporarily.
