Inactive Doser Valve

[kozakvod]

New development:

For the purpose of getting air on the system to raise the truck up enough for me to crawl under it. (Im a car hauler so my ground clearance is very tough for a bigger guy like myself) So upon starting the truck, i noticed the once solid and then flashing red light on the def gauge was no longer active.

I hooked up insite. All faults were inactive.

Good on one hand, frightful on the other.

Is it true everything is functioning (POSITIVE) or is it a False-Positive and as soon as I get up to highway speed and everything at full run operating temperature it’s going to show itself again?

Can I know before I go?