DPF Regen Cycle

poppy510 · April 5, 2022

I've read multiple posts where members mention noticing this or that "when the diesel particulate filter is in the regen cycle." How would one know when the filter is in the regen cycle? I run a VeePeak OBD meter with OBD Fusion and even it does not have the capability to indicate a regen cycle. Am I missing something?

Dirk13 · April 6, 2022

I have the same App and Bluetooth OBD II reader. It does actually have the capability to indicate a regen cycle.

In OBD Fusion you need to look at the PiD “DPF Regen Status”. It will either be a 0 or a 1.

If it’s 0, regen is not happening.

If it’s a 1, regen is happening

Other than that. You will notice a significant increase in EGTs during regen if you’re monitoring them. Also hear an audible change from the exhaust.

Edited April 6, 2022 by Dirk13

poppy510 · April 6, 2022

1 hour ago, Dirk13 said:

I have the same App and Bluetooth OBD II reader. It does actually have the capability to indicate a regen cycle.

In OBD Fusion you need to look at the PiD “DPF Regen Status”. It will either be a 0 or a 1.

If it’s 0, regen is not happening.

If it’s a 1, regen is happening

Other than that. You will notice a significant increase in EGTs during regen if you’re monitoring them. Also hear an audible change from the exhaust.

Oh cool thanks, any idea how to display the transmission gear? "Transmission Actual Gear Status" PiD does not seem to work.

redwngr · April 6, 2022

Only lasts about 11 or 12 miles on an LM2, so it's easy to miss.

(and GM intends it to be a non-event requiring nothing from the operator)

Dirk13 · April 7, 2022

22 hours ago, poppy510 said:

Oh cool thanks, any idea how to display the transmission gear? "Transmission Actual Gear Status" PiD does not seem to work.

I’m not sure. I looked around (not real hard) but didn’t find anything. Hopefully someone else has an answer because I’d like to know as well.

It should be possible to see, I just don’t know how to do it in OBD fusion.

redwngr · April 7, 2022

If you speed (mph) isn't at least mid 60's it's likely not in 10th.

2021 3.0

Banks iDash

DPF SL - soot load as %

REGEN - active or off

DPF regen % (indicates as % how close to next recgen; it isn't always the soot load that triggeres regen)

LSTRGN - Miles since completion of last regen

Boost pressure

EGT

DEF Level

Current gear, and if locked or not (the only time I've seen it unlocks is in first gear and stopped or very close to stopped)

This shot taken nearing the end of a regen when towing.

(mine usually used as a 2 lane driver and usually regens in the 200 - 300 mile range)

I track regens (just cuz I can) and iirc this is the longest regen interval one this truck has had.

Black dot on top blue bar is an LED. Blinks (green) ~~during regen.~~ when it is logging data. (camera caught in the 'off' portion of blink)

idash can be configured to display any of about a 100 items that the truck monitors.

Number and configuration of display is easily changed.

8 is the max it can display at once.

Groups of 8 can be saved for easy switching.

The data collecting version can save data for many many items at once.

Edited April 9, 2022 by redwngr

eckseleven · April 9, 2022

On 4/7/2022 at 11:29 AM, redwngr said:

If you speed (mph) isn't at least mid 60's it's likely not in 10th.

2021 3.0

Banks iDash

DPF SL - soot load as %

REGEN - active or off

DPF regen % (indicates as % how close to next recgen; it isn't always the soot load that triggeres regen)

LSTRGN - Miles since completion of last regen

Boost pressure

EGT

DEF Level

Current gear, and if locked or not (the only time I've seen it unlocks is in first gear and stopped or very close to stopped)

This shot taken nearing the end of a regen when towing.

(mine usually used as a 2 lane driver and usually regens in the 200 - 300 mile range)

I track regens (just cuz I can) and iirc this is the longest regen interval one this truck has had.

Black dot on top blue bar is an LED. Blinks (green) during regen. (camera caught in the 'off' portion of blink)

idash can be configured to display any of about a 100 items that the truck monitors.

Number and configuration of display is easily changed.

8 is the max it can display at once.

Groups of 8 can be saved for easy switching.

The data collecting version can save data for many many items at once.

Tell me more about this LED. What did you do to set up the flashing? I don't recall mine having an LED though. This is my set up:

redwngr · April 9, 2022

1 hour ago, eckseleven said:

Tell me more about this LED. What did you do to set up the flashing? I don't recall mine having an LED though. This is my set up:

Good catch.

I had a brain fart.

It's the data logging version of the iDash. (they call it DataMonster, iirc)

The LED flashes to indicate that it is recording.

I'll edit the original post.

( I always run with it logging data, so it would have been blinking)

From iDash 1.8 manual:

When viewing the Gauge Screen of the primary iDash 1.8, a green dot
at the top of the display will flash indicating that the device is logging.
When logging is turned off, this dot will not appear.

Edited April 9, 2022 by redwngr

lonewanderer812 · April 27, 2022

I've only had my truck a short time but the smell was the other thing I noticed when I hit Regen the first time. I was at the end of a 30mile/30minute drive and I noticed a smell coming from my truck when I came to a stop. The exhaust was louder and I checked my MPG for the past 25 miles and it was a good bit lower than it normally would be showing after that drive. But yeah it's not SUPER obvious when it happens but if you're paying attention to your truck you'll usually catch it when it happens. GM wants the act to be completely transparent to the user and will warn you if the particulates are still too high and wants you to keep driving to burn it off. The manual says the DIC will light up telling you it wasn't able to clean it up and needs you to keep driving. I kind of want to get one of those idash modules though because a huge part of my job is monitoring IT systems so I always like knowing what data my vehicle holds.