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Don't believe we've performed the leakdown test. I have no problem starting the tractor or feeling that it's losing prime.

Still have same code 125.
Considering performing re-test on CaC.

(09-12-2022 )brich240 Wrote: [ -> ]Don't believe we've performed the leakdown test. I have no problem starting the tractor or feeling that it's losing prime.

None of that matters, I don't think they will regen properly with a leaky fuel rail.

Truck appears to be regen-ing fine right now. Temps look good. Cleaned the EGR valve (finally). O.t really didn't look that bad. It was sooted, but nothing like I kind of expected. Retested CaC (incl. Boots) held pressure firmly.
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EGR cooler efficiency during regen @ 96-100%
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After treatment DPF Soot Load currently at 0.00 value units. Maximum was 1.02

Wondering if ECM version update "26" is the most recent?

(09-13-2022 )brich240 Wrote: [ -> ]Truck appears to be regen-ing fine right now. Temps look good. Cleaned the EGR valve (finally). O.t really didn't look that bad. It was sooted, but nothing like I kind of expected. Retested CaC (incl. Boots) held pressure firmly.
########
EGR cooler efficiency during regen @ 96-100%
########
After treatment DPF Soot Load currently at 0.00 value units. Maximum was 1.02

So what's the problem then? I thought you were having excessive regening? Your long post is kinda confusing, maybe it's the covid in my brain ???

Not trying to "muddy the water". Basically, after all of this, I'm STILL getting Code 125, and have absolutely NO IDEA why. Especially, since this past Saturday, we've crawled all over this truck. Baffling.
And I do appreciate your time reading over this long post.

Did you check the baro sensor reading? Intake map pressure minus baro sensor pressure equals actual boost. So if the baro is off the equation would be wrong giving you a false low boost code?