Originally Posted by BIGGERED
Originally Posted by Sammy
Originally Posted by BIGGERED
Are you sure your def tank level isn’t to low?

Do you have a code reader that will clear code?

Do you know what relay(s) you need to jumper to get you 150 more miles (on one key cycle)?

Hit up a Cummins forum, it’s a modern diesel you need to be prepared!

Red




I always keep it at 100% full.
It cleared the code once then 35 miles later, no engine light but said it was going to to 5mph after the next 150 miles.
I was 450+ miles away from home yesterday.


I was digging on the Cummins forums and there was mention of letting your def tank level drop a bit as when you continually top it off the system thinks you are not using any DEF.

Something to consider!

Red




Diesel tech says there is a shelf life once added to your DEF tank. If you're not driving it a lot and putting a load on the engine, theres a great possibility that the DEF fluid is getting old and contaminating the system causing error codes.
Just throwing this out there which does make sense. Truck isn't driven much at all.