SPN faults codes clear up on their own, no engine light... how should I handle?

Intermittent issues are some of the toughest to find. Wait until the fault is active and your truck is broken to take it in for diagnostic. Much better chance at locating the issue.

Also share your specific truck information and fault codes logged so we can point you in the right direction.

If you in the shop, get printouts of inactive faults to share.

 

You can check each one of those with a Google search.
For instance the first code on the list, SPN 520289 FMI 4, indicates a short in your mirror heater.

 

I don’t trust ELDs for fault readouts. If the truck is not broken don’t try to fix it.

 

In post 1 you state that there is no engine light on. If you truly had a problem the engine light would be on and so would other dash indicators. Like Goodysnap said: "I don't trust ELD's for fault readouts". You should not trust these either. If you are really concerned about it I would have someone hook up a scan tool or laptop and see what the ECM is reading, not the ELD. There was a recent thread on here about the ELD in a Freighliner. They have to be hooked up correctly per Freightliner. Who installed the ELD? That is where your problem is. You can go to the dealer but they probably won't spend anytime on something installed after the sale, especially not as a warranty repair.

 

Stoops Freightliner in Indy installed the Qualcomm in my 2016 Cascadia you could check with them if you're in the area.

 

It's the truck's version of "is it appendicitis or just gas?".

If thr code clears, don't worry.

If it keeps popping up ask a question of your friendly neighborhood mechanic.

If the codes stick around through 3 ignition cycles, then I start worrying.