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Regens at alarming rate!

mbarber84 said:
Yes that was me.
I had been using Sheetz fuel since the truck was new. So I don’t think the higher percentage of biodiesel was the cause of the change in regeneration frequency, although it may not be helping either. The significant change happened between 6/27/23 and 7/7/23. Prior to 7/7, the truck went 1,053 miles between regeneration cycles. On 7/7/23, the truck ran a regen cycle at only 328 miles since the last one. It has never really recovered from that one. I’ve only been able to accomplish 250-400 miles at most since that date. View attachment 63366
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That's interesting considering that BD should actually reduce soot production, but is far less effective at producing the temps needed for active regen. Because of the increased oxygen content it usually increases NOx emissions while which might be driving more EGR which could create more soot offsetting the PM reduction from the intial burn of the fuel.

Impact of Biodiesel on Particle Emissions and DPF Regeneration Management in a Euro5 Automotive Diesel Engine

Biofuel usage is increasingly expanding thanks to its significant contribution to a well-to-wheel (WTW) reduction of greenhouse gas (GHG) emissions. In addition, stringent emission standards make mandatory the use of Diesel Particulate Filter (DPF) for the particulate emissions control.The different
www.sae.org www.sae.org

I'm not a fan of BD at all. FAME is trash with it's only redeeming quality being lubricity, but its storage life and other issues negate that. I'm a huge fan of renewable diesel taking the same bio feed-stocks and refining them like petro-diesel to make something that's basically synthetic diesel with all the upsides of petro-diesel and non of the downsides.
 
I'm opening a star case with Ram Cares, hopefully they can expedite something. I really like my 3500, but I count on it for work, and for pulling my camper, and just can't afford to risk limp mode, or shutdown because of EPA emissions. If parts continue to stay unavailable, I may be forced to look elsewhere
 
Firebird said:
Well, took the truck in this morning for regen issues and recalls. Recalls done, except grid heater, no parts available. Tech said that I have a bad DPF sensor, so part is ordered. Of course unavailable yet again due to the strike. America is FUBAR, we can't even acquire parts anymore.
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That happened with mine when I only had 13k miles on it back in March of 2022.

Are you getting a p24b0-00 code?
 
Firebird said:
I'm opening a star case with Ram Cares, hopefully they can expedite something. I really like my 3500, but I count on it for work, and for pulling my camper, and just can't afford to risk limp mode, or shutdown because of EPA emissions. If parts continue to stay unavailable, I may be forced to look elsewhere
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That's what I did. Ask for a rental truck. I got one through Enterprise. I got fully reimbursed for the rentals. I didn't get a 3500 but they were all 2500's

When i opened a Star case, I asked about a rental. They said keep all the paperwork and he would try his best.
I made sure to tell him I had trailers to tow and I cant be with out a truck.
 
Just updating for those following. For the last two tanks of fuel, I switched where I buy my diesel. I used to use Sheetz as their price was always 20-30 cents cheaper but recently started using my local BP. The last two tanks, I’ve noticed a significant increase in passive regeneration. The truck seems to be able to generate higher EGT’s on the highway. The effectiveness of the passive regeneration seems to be keeping the filter cleaned out, as I’ve noticed several small increases in soot load, followed by drops back to 0% during 30-40 minute highway runs at 70-75mph unloaded. I also stopped using the Hotshots EDT. Obviously this is still a developing change so I’ll continue to monitor and report back, however my intuition suggests some of the issue I have been dealing with might be fuel related. My suspicion is that the sheetz fuel is a higher bio content, which resulted in lower EGT’s and less effective passive regeneration while running shorter highway cycles.
 
All of this emissions BS has me seriously considering jumping back into a gas HD
 
mbarber84 said:
Just updating for those following. For the last two tanks of fuel, I switched where I buy my diesel. I used to use Sheetz as their price was always 20-30 cents cheaper but recently started using my local BP. The last two tanks, I’ve noticed a significant increase in passive regeneration. The truck seems to be able to generate higher EGT’s on the highway. The effectiveness of the passive regeneration seems to be keeping the filter cleaned out, as I’ve noticed several small increases in soot load, followed by drops back to 0% during 30-40 minute highway runs at 70-75mph unloaded. I also stopped using the Hotshots EDT. Obviously this is still a developing change so I’ll continue to monitor and report back, however my intuition suggests some of the issue I have been dealing with might be fuel related. My suspicion is that the sheetz fuel is a higher bio content, which resulted in lower EGT’s and less effective passive regeneration while running shorter highway cycles.
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Dealer appointment this past week to address a couple issues; excessive regens, hum from rear diff, and constantly resetting uconnect along with trans dipstick, grid heater relay and missing particulate sensor recalls. Long story short, parts are on order for rear end and particulate sensor. Tech said with the sensor install PCM gets reflashed that might help with regens (I wasn't convinced but kept that to myself). He asked about fuel quality and if I use any additives. Let him know I had just switched to shell fuel on my last fill up with no noticeable change. Had not used additives, it seems options are mixed. Anyways, I purchased a bottle of Diesel Kleen and put 12oz in at my last fill up. Went into regen at normal rate but it did complete in 38 miles, my best to date. DPF gauge continued to increase as normal. When I get to the ~45% bar it normally would regen within a couple miles. This time 50 miles goes by then the gauge goes down a tick! First time I've ever seen that. Ended up with 265 total miles before regen, my best by 25%. I've only used 1/2 tank of the additive enriched fuel. Time will tell, but that's where I am currently. Fuel related? For now, it seems so.

1697810980341.png
 
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After reading all the post in the thread I wanted to also put my 2022 2500 down as one of the trucks that also has regen issues. Bought at start of Oct. 2023 with a little over 12k miles. Drove home from purchasing 250+ miles. Going to local town 35 miles had P2459 code. Made appointment with local dealership for code. They installed all recall items except heater relay and forced regen. Left dealership 10 miles later did another regen and was regening every 40-50 miles. Takes 80+ miles to regen on highway at 75+ mph. Returned to dealership and they have opened a star case as their 2 techs couldn't find problem. Hopefully will soon be fixed........
 
Damman said:
After reading all the post in the thread I wanted to also put my 2022 2500 down as one of the trucks that also has regen issues. Bought at start of Oct. 2023 with a little over 12k miles. Drove home from purchasing 250+ miles. Going to local town 35 miles had P2459 code. Made appointment with local dealership for code. They installed all recall items except heater relay and forced regen. Left dealership 10 miles later did another regen and was regening every 40-50 miles. Takes 80+ miles to regen on highway at 75+ mph. Returned to dealership and they have opened a star case as their 2 techs couldn't find problem. Hopefully will soon be fixed........
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What brand / type of engine air filter is in the intake box? Factory?
 
Looked like a wix to me. Asked service department if it was correct, he said was first thing tech checked.
 
No glue strips.
No solution to problem according to star.

Will see what resolution is offered.
 
My truck went from regens only on the 24hr schedule to regens every 200 miles. I tried to boost leak test the truck and all the pressure was coming out of the oil fill cap if I had it off. If I left it on I could get pressure up to about 15 psi then I kinda just sounded like are moving through the engine out the exhaust? I couldn’t tell it sounded like air was escaping out the back drivers side of the engine.

I sprayed soapy water on every boost pipe I could see and saw no leaks or bubbles. But it seems like there’s definitely a boost leak somewhere.

Did I miss any obvious areas to check at the back of the engine?


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Toyotaguy said:
No, even at tdc wouldn’t some valves be open?


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How are you pressurizing it?
Depending on how it's hooked up you could be forcing air up the crankcase vent, ive also seen air get past the turbo seals and into the crankcase through the turbo oil drain, or possibly backfeeding through the egr system
 
I was just thinking about this. The Ccv returns right into the top of the turbo, I was using a standard boost leak tester https://a.co/d/2522fme this one to be exact, so I was basically pushing pressure straight into the crankcase? Or is there a check valve in the Ccv circuit that would prevent air going that direction like in a gas engine?


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