Exhaust Particulate Matter Sensor Fail - Page 2 - Chevy Colorado & GMC Canyon
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post #21 of 88 (permalink) Old 03-22-2017, 01:34 PM
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Originally Posted by nick_3208 View Post
I have been waiting for a replacement sensor for 2.5 weeks... GM has realized that these sensors are poorly built and has gone to Delphi for a replacement, Delphi is still working on it... I would recommend waiting until the new part exists as well as a service bulliton on the matter before trying to get anything done. I will update when the new part is on the way.
Same situation here...

Surprised we haven't seen more posts regarding the same issue...

The dealer didn't seem surprised at the part failure nor the back order...

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post #22 of 88 (permalink) Old 03-22-2017, 01:50 PM
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hm, my regen is about every 250 miles also.

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post #23 of 88 (permalink) Old 03-22-2017, 01:51 PM
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My CEL has been going on an off (on it's own, I reset it once) due to p24B1 code, have an appointment @ dealer tomorrow AM, will keep all informed...

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post #24 of 88 (permalink) Old 03-22-2017, 02:27 PM
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Originally Posted by lqdchkn View Post
Are you completely stock too seeing the crappy +/- 200 regens? I'm really hating that GM says they should be happening once per tank or tank and a half and I'm averaging 2 per tank

I'm inclined to think this sensor is outta wack and needs to be replaced, it's not getting cleaned properly during regens or for some reason the EGR is overactive and creating excess soot.
I'm curious, everyone talks about "the sensor". I thought concerning the regen there is a sensor before and after the particulate filter. So arent there 2 sensors that you guys have to guess are working correctly?? (pressure sensors) Cant the ecm check the sensors when the truck insnt running, comparing them to ambient air pressure? So if one was out of wack the light would come on. Or, is it some other sensor you are talking about?

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post #25 of 88 (permalink) Old 03-22-2017, 02:32 PM
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Wish GM put an idiot light in the gauge cluster to indicate when regens are occurring. I have to rely on the Torque Pro app instead.

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post #26 of 88 (permalink) Old 03-22-2017, 02:53 PM
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Originally Posted by JScottM View Post
I'm curious, everyone talks about "the sensor". I thought concerning the regen there is a sensor before and after the particulate filter. So arent there 2 sensors that you guys have to guess are working correctly?? (pressure sensors) Cant the ecm check the sensors when the truck insnt running, comparing them to ambient air pressure? So if one was out of wack the light would come on. Or, is it some other sensor you are talking about?
IIRC, one sensor in the DPF checks the exhaust pressure differential; i.e. as soot builds up the the DPF, the pressure changes.
Then there is a sensor just past the DPF that "senses" soot flow.
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post #27 of 88 (permalink) Old 03-22-2017, 03:06 PM
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Has anyone just rodded out a DPF?

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post #28 of 88 (permalink) Old 03-22-2017, 06:30 PM
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Something else to consider about regen intervals. The fuel in your area, PA fuel contains 2% bio-diesel and other states have more content. More bio-diesel= less particulate?

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post #29 of 88 (permalink) Old 03-22-2017, 07:10 PM
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Originally Posted by ssgjurista View Post
IIRC, one sensor in the DPF checks the exhaust pressure differential; i.e. as soot builds up the the DPF, the pressure changes.
Then there is a sensor just past the DPF that "senses" soot flow.
Correct.

I believe and he can correct me if Ive got this wrong but it was @hacklerjason that found there are 3 ways for the truck to regen.

1. If the differential pressure sensor in the DPF sense the DPF is clogged
2. Engine run time, X amount of fuel burned = X amount of soot so even if the above isn't saying the DPF is clogged the ECM is programmed to trigger a regen anyway
3. Distance travelled, if the above don't trigger a regen but you gone X amount of miles, you must have used X amount of fuel so that means you probably need a regen.

As long as 1 of those happens and the truck successfully regens all triggers are reset so that any of them can trigger the next regen as needed
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post #30 of 88 (permalink) Old 03-22-2017, 07:12 PM
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Originally Posted by lqdchkn View Post
Correct.

I believe and he can correct me if Ive got this wrong but it was @hacklerjason that found there are 3 ways for the truck to regen.

1. If the differential pressure sensor in the DPF sense the DPF is clogged
2. Engine run time, X amount of fuel burned = X amount of soot so even if the above isn't saying the DPF is clogged the ECM is programmed to trigger a regen anyway
3. Distance travelled, if the above don't trigger a regen but you gone X amount of miles, you must have used X amount of fuel so that means you probably need a regen.

As long as 1 of those happens and the truck successfully regens all triggers are set.
Close....
Fuel based = how much fuel is consumed since last regen
Time based(mileage) = engine hours since last regen
DP Based = differential pressure sampled directly at the dpf canister

The first one to trip of the three initiates regenerations

Edit for explanation of DP sensor
The differential pressure sensor is a pressure sensor that samples 2 different ports, one before, and one after the dpf. It is similar to an absolute manifold pressure except the sampling of the atmos pressure is on board... Dpf soot qty is measured using back pressure and compared to atmos pressure via the second sampling tube... This allows for self calibrating during key on engine off, just before start up... When you key on it cross checks all the sensors for validity, then stores the center value in VRAM, then uses that to read while engine running... Standard pressure transducers will not work in that location as they will not compensate for changes in elevation

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Last edited by hacklerjason; 03-22-2017 at 07:17 PM.
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post #31 of 88 (permalink) Old 03-22-2017, 09:32 PM
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Originally Posted by Vinolush View Post
Same situation here...

Surprised we haven't seen more posts regarding the same issue...

The dealer didn't seem surprised at the part failure nor the back order...
Some won't have this issue, no sensor to fail

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post #32 of 88 (permalink) Old 03-22-2017, 09:52 PM
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Originally Posted by ssgjurista View Post
IIRC, one sensor in the DPF checks the exhaust pressure differential; i.e. as soot builds up the the DPF, the pressure changes.
Then there is a sensor just past the DPF that "senses" soot flow.
so what sensor are you guys thinking might be out of wack? I'm guessing the pressure sensor??

edit/ nm...must be pressure, just read the soot sensor. Sounds like that thing just checks to see if you gutted the CAT so to speak.....yes?

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Last edited by JScottM; 03-22-2017 at 09:59 PM.
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post #33 of 88 (permalink) Old 03-22-2017, 11:32 PM
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[QUOTE=hacklerjason;4157745]Close....
Fuel based = how much fuel is consumed since last regen
Time based(mileage) = engine hours since last regen
DP Based = differential pressure sampled directly at the dpf canister

The first one to trip of the three initiates regenerations

Edit for explanation of DP sensor
The differential pressure sensor is a pressure sensor that samples 2 different ports, one before, and one after the dpf. It is similar to an absolute manifold pressure except the sampling of the atmos pressure is on board... Dpf soot qty is measured using back pressure and compared to atmos pressure via the second sampling tube... This allows for self calibrating during key on engine off, just before start up... When you key on it cross checks all the sensors for validity, then stores the center value in VRAM, then uses that to read while engine running... Standard pressure transducers will not work in that location as they will not compensate for changes in elevation


Waaaaay above my pay grade!
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post #34 of 88 (permalink) Old 03-25-2017, 02:33 PM
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At 23,000 miles my check engine light came on, dealer says it the dpf sensor and connector. They ordered the parts, but there is no estimated date to get the parts. Am I okay to drive the truck like this, or will it cause damage elsewhere on the vehicle??
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post #35 of 88 (permalink) Old 03-25-2017, 04:23 PM
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Originally Posted by Trplxl2 View Post
At 23,000 miles my check engine light came on, dealer says it the dpf sensor and connector. They ordered the parts, but there is no estimated date to get the parts. Am I okay to drive the truck like this, or will it cause damage elsewhere on the vehicle??
Im in the same boat.

I believe it's okay to assume yes

Dealer advised it's okay as long as I see a regen as usual. If I don't regen they will do a forced regen.

May be a while before we get the new sensors

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post #36 of 88 (permalink) Old 03-26-2017, 02:56 AM
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so how do you know a regen is in progress?
my truck has 17000 miles and I have never seen a regen yet
HOLLYWOOD
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post #37 of 88 (permalink) Old 03-26-2017, 10:55 AM
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Originally Posted by hollywood8118 View Post
so how do you know a regen is in progress?
my truck has 17000 miles and I have never seen a regen yet
HOLLYWOOD
It has you just haven't felt it, it physically can hold that much soot so youd have long been SOL if it really hadn't regened ever.

Check this thread:
Regen Intervals and noticeabilty
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post #38 of 88 (permalink) Old 03-26-2017, 12:58 PM
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I had the same failure at 15k miles, I am going to delete the DPF once warranty runs out
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post #39 of 88 (permalink) Old 03-26-2017, 03:04 PM
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Originally Posted by Brayan Rosales View Post
I had the same failure at 15k miles, I am going to delete the DPF once warranty runs out
DPF is considered an emissions item. Depending on the part some emissions items are warrantied until 80k miles. You sure you want to wait that long? lol
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post #40 of 88 (permalink) Old 03-26-2017, 03:55 PM
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DPF is considered an emissions item. Depending on the part some emissions items are warrantied until 80k miles. You sure you want to wait that long? lol
Yep.
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