Dpf help

[737ame]

Is there some where online I might be able to find this recall?

[Jday]

Just a heads up, I've found GM dealerships to be extremely ignorant when it comes to DPFs. It's pretty sad when I (19 years old at the time) was educating their "techs" about the proper function of a DPF. It took about 20 visits to multiple dealerships before I found one that actually knew about the trucks they sell. The issue ended up being what I had told them from day one, although I heard everything from "change your air filter" to "all diesels blow smoke."


The bill for this was about $1000 under warrantly. I now have a DPF with only 2 regen cycles on it sitting in storage.

[chevor]

Heres whats on the GM site.

ANSWER: Should a recall on your vehicle ever occur, GMC will notify you by mail. You can also contact any GMC Dealer or visit the GMC Owner Center, or you may call 1-800-462-8782.
I got a notice of a voluntary recall through e-mail about a year and half ago.

[smokinlmm]

It's not a recall issue, your stuck, it will have to go to a dealer unless you know a tech who is familiar with the DPF functions...

If you want you can try to clean the MAF sensor and see if it helps, it could be covered by oil from your air filter and sending a false signal. Thus causing the truck to over fuel for the boost and clog the DPF quickly...

Another cause of excessive regens is a sticking egr valve...

That's one of the problems with this system, it's hard to pinpoint an issue when one arises...

[737ame]

So, I checked my dtc when igot home and it was a p244c. Which supposedly is egt to cold for dpf to regen? Any comments?

[smokinlmm]

Originally Posted by 737ame

So, I checked my dtc when igot home and it was a p244c. Which supposedly is egt to cold for dpf to regen? Any comments?

That's a turbo related code, Does your trucks exhaust note change after you start the truck. It should go from a rumble to a hiss, that is the turbo veins sweeping and relearning. If it is not then there is a problem with the vein sensor or controller and when this happens the DPF filter can clog very quickly...

[KensAuto]

Originally Posted by 737ame

So, I checked my dtc when igot home and it was a p244c. Which supposedly is egt to cold for dpf to regen? Any comments?

you need to have a shop scan the system and test that exhaust probe/sensor. If it fails or becomes inacurate, it won't regen...If it's reading low, the pcm is probably adding more fuel to try and heat it up...it does this until it realizes that the temp is not going up and throws a code.

[KensAuto]

DTC P244C (ENGINE CONTROLS AND FUEL - 6.6L)

Document ID# 1961334


DTC P244C

Diagnostic Instructions
•Perform the Diagnostic System Check - Vehicle (with HP2)Diagnostic System Check - Vehicle (without HP2) prior to using this diagnostic procedure.
•Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P244C: Catalyst Temperature Too Low During Regeneration

Circuit/System Description

The diesel oxidation catalyst (DOC) converter controls emissions of non methane hydro carbons (NMHC), and soluble organic fraction (SOF). The DOC is also utilized in regenerating the exhaust particulate filter (EPF). The engine control module (ECM) monitors the exhaust gas temperature (EGT) sensor 1 during regeneration to determine if regeneration temperatures can be maintained.

If the ECM detects that the DOC cannot maintain a pre-determined temperature during a regeneration event this DTC will fail, and the regeneration event aborts.

Conditions for Running the DTC
•The engine control system is in an active regeneration.
•DTC P244C runs continuously when the above condition is met.

Conditions for Setting the DTC
•The ECM determines that the EGT sensor 1 is less than 75°C (167°F) of a calibrated threshold, during an active regeneration event.
•The condition exists for greater than 5 minutes.

Action Taken When the DTC Sets
•DTC P244C is a Type A DTC.
•Regeneration will be inhibited.

Conditions for Clearing the DTC

DTC P244C is a Type A DTC.

Diagnostic Aids
•The use of 500 ppm sulfur, non-road diesel fuel containing red dye, or the continuous use of non ultra low sulfur fuel may be a possible contributor to the degradation of metals in the DOC. A degraded DOC will not light off, and properly maintain the necessary heat required to completely regenerate the particulate filter.
•If EGT sensor 1 (before the DPF) is slow to respond to exhaust gas temperature changes, or sticks in range, this DTC may set.

[chevor]

Winter front on the truck?

[737ame]

No I did not have my winter front on this particular day.
I reset the code and it has not set again.