What's up with this DPF % gauge on my 2019

[R.Taylor]

So... After checking my DPF capacity % gauge on the center cluster off and on for the past 2000 miles it has always shown 0% of being full but twice now I have smelled it doing a regen, When I smelled it I checked the display and it said it was in regen. Now with 2200 miles on the odo I noticed one day that my DPF capacity was at 25%... I figured it must have some internal calculations it does before actually representing the actual filter capacity.... A learning system perhaps? Well, A couple of days later I looked at the gauge again and now it reads 0%. Is this another "Fake" gauge like the oil pressure or is something wrong. It's definitely done 2 regens since new and I've used about 4 gallons of DEF. I drive it like I stole it, RPM's are always 1800 to 2000 on the highways. Should I take it in for a look or does it figure it's algorithm out after a bit.

 

[TFucili]

It's a mystery. Mine has also done numerous regens with the gauge on zero. Concensus is that there are other parameters at play i.e. hours, miles. It seems they've got it figured out, but I'd love to gain a full understanding of the regen strategy.

 

[AH64ID]

The 13-18 trucks will do a regen every 24 hours of run time regardless of DPF loading. I’ll be the 19 has a similar frequency.

I don’t have a DPF %age gauge but my CTS2 shows DPF pressure differential. It will regen even with 0.01psi.

Since I’ve started taking notes of engine hours at regen I have yet to see a regen in less than 24 hours of run time. All my regens seem to be time based and not DPF loading based.

 

[Signal73]

Mine seems to do the 24hr/1kish mile regen strategy. I always leave the DPF screen up on my dash and have never seen it above 0%. So far with 2700mi. I’ve seen 2 regens take place. I have used about 3 gallons of DEF. at least half of my miles have been towing.

 

[R.Taylor]

Mine seems to do the 24hr/1kish mile regen strategy. I always leave the DPF screen up on my dash and have never seen it above 0%. So far with 2700mi. I’ve seen 2 regens take place. I have used about 3 gallons of DEF. at least half of my miles have been towing.

Seems about on par with mine... A regen every 1k and about 3 gallons of DEF... I'm at 2235 now. On another note.... I'm starting to see quite a few 2019 2500/3500's of various trims on the streets around here.. Even more so in Sonoma county.

 

[Wiredawg]

Regens and SCR (DEF) are two different systems. Regens use diesel fuel to burn particles in your DPF and DEF is downstream and a percentage 2% of fuel burned.

Others explain it better, but that's the idea.

Cheers, Ron

 

[AH64ID]

Watch the engine hours between regens, not miles. I’ll bet you see a more constant frequency... unless you always average the same speed.

Regens and SCR (DEF) are two different systems. Regens use diesel fuel to burn particles in your DPF and DEF is downstream and a percentage 2% of fuel burned.

Others explain it better, but that's the idea.

Cheers, Ron

Yep, DEF has nothing to do with regen.

 

[Ozymandias]

I know I said it before - don't overthink it, stop watching that gauge.
It will do its Job all alone, if something goes wrong the truck will tell it to you.

 

[elephantrider]

mine is the same way, always shows 0%, even when it is in regen.

 

[Hoefler]

I just turned 11,000 miles on my 2019, I have questioned the tech that works on my truck about the gauge. He said if the truck is driven as it should for the purpose that it was designed for, you will never see that gauge move off of zero. Futhermore, regens will be passive instead of having to do an active regen. The last time my truck was in for service, he showed me that I have had only 2 active regens in 9,000 miles.

 

[TFucili]

I have had mine do an active regen after 300 miles of 70-75+ driving, though empty, but pulling some good grades on I-17 where it's on the boost pretty good.

 

[AH64ID]

I just turned 11,000 miles on my 2019, I have questioned the tech that works on my truck about the gauge. He said if the truck is driven as it should for the purpose that it was designed for, you will never see that gauge move off of zero. Futhermore, regens will be passive instead of having to do an active regen. The last time my truck was in for service, he showed me that I have had only 2 active regens in 9,000 miles.

Interesting. That makes it sounds like they changed the run time regen, but others in this thread mare seeing more regens than that.

I have had mine do an active regen after 300 miles of 70-75+ driving, though empty, but pulling some good grades on I-17 where it's on the boost pretty good.

We towed across Idaho last Labor Day and stayed outside West Yellowstone at about 9-10 mpg and high DPF EGT's, which equated to around 6 hours of passive regen at temps 80-100% of active regen. The next morning I went into active regen right off the bat, but that was a 24 hour run time regen. Still thought it was funny... but that's how they have them programmed.

I've averaged 35 mph this year, so 24 hours is about 840 miles between regens.