Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
it should be safe to drive, but after several fails the ecm will limit the truck on mph. would drive it straight to dealer with restarting it several times. On this system after the repairs are made there are several resets that have to be done that are not mentioned in the service manual. The dealer may have the problem fixed and just needs to perform resets. Also certain codes will cause ecm to ignore other failures. I have has 2011-13 duramaxs in the past that after I repaired the Def concern, I would find NOX sensors that had failed and not set a code due to the DEF code setting first.