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Old 10-01-2007, 03:41 PM   #1 (permalink)
slowguy_63
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code # p244c

Set a cel the other day, got to work and scaned it. Came up
with a p244c, alldata and other sorcess do not have any info yet.
Any GM techs have any info. No perfomance problems, cleared code
and has not reset yet, but have not completed enough drive cycle
to up all monitors. Thanks for any info...
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Old 10-01-2007, 04:37 PM   #2 (permalink)
roblrobl
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DTC P244C: Catalyst Temperature Too Low During Regeneration

• 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.


Are you still all stock?
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Old 10-01-2007, 06:01 PM   #3 (permalink)
slowguy_63
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Yes , still stock. Thanks for the help.
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Old 10-01-2007, 06:05 PM   #4 (permalink)
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if you are not stock and you are using a custom tuning platform, try changing the reported value to either non emissions MIL off or not reported MIL off, if your stock then its dealer time
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Old 10-02-2007, 06:55 AM   #5 (permalink)
Dmaxpower2
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By any chance did your water in fuel lamp ever illuminate?

P244C is a diagnostic that monitors DOC during Regen only, if the DOC cannot substain regen temps for any reason this code will set.

Things to look for when this codes sets:
  • Water in fuel, fuel with a high sulf content
  • Any other codes, they need to bee adressed first
  • Contaminated DOC
  • A damaged DOC substrate, tap on the DOC with a rubber hammer and see if rattles.
You did the right thing by reseting the DTC, it may have been a bad tank of gas. If it resets, get it to a dealership.
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Old 10-29-2007, 09:40 PM   #6 (permalink)
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so i had this code set while running a tune with efi live. i reset the code but it kept resetting. i got this at the same time as the clean dpf message. i ended up driving around and clearing it at the same time so the trcuk could regen. once the regen was done, i stopped getting the code. is this something i should take it to the dealer for? im planning on deleting the dpf soon so will i still have problems like this?
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Old 10-29-2007, 10:43 PM   #7 (permalink)
willoutplayu
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I was towing my toyhauler the other night and got a p244b code. Does anyone know what that means? I am running the PPE tuner and was on level 2. I am also running an AFE cold air intake. Everytime I tow i get the 2459 code. I am used to that one. The p244b was new though.
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Old 10-30-2007, 12:25 PM   #8 (permalink)
Dmaxpower2
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Quote:
Originally Posted by willoutplayu View Post
I was towing my toyhauler the other night and got a p244b code. Does anyone know what that means? I am running the PPE tuner and was on level 2. I am also running an AFE cold air intake. Everytime I tow i get the 2459 code. I am used to that one. The p244b was new though.
You are packing the DPF with soot.
P244B = DPF differential pressure too high. This code sets when the ECM sees a high "delta p" across the DPF as indicatied by the pressure sensor. The soot mass is usually over 90 grams.

P2459= Regeneration too often. This code sets when the average running time between regens is less 1 hour and 10mins. It will take 2-3 regens for the ECM to calculate the average running time between regens.

Now, you're not going to want to hear this, but here goes, the most likely cause is your power up devices. The ECM cannot calculate the added fuel. The modified air intake system is throwing off the MAF tables too, and now, the calculated vs Actual airflow is off. Thus, there's more soot in the DPF than the ECM calculated. In addition, the towing factor comes into play, towing = more fuel, the additional fuel means more regens.

Regens are base off of several factors they are:
Engine Run Time OR
Fuel Used OR
Miles Driven OR
Delta pressure OR
The Calculated amount of soot ( soot model)

Notice we are saying OR, each one of the above conditions when reach a calibrated threshold can trigger a regen. When power devices come into play the soot model, run time, fuel used and miles driven are now skewed. The only thing that's left that we can
rely on is the Delta Pressure. Once the delta p has reached the calibrated threshold DTC P244B sets and it's too late for a regen, the ECM will not trigger a regen because of the excessive soot accumulation. (safty net)

I heard that some of your power up devices can trigger a manual regen, if so, then monitor your soot mass parameter, and trigger a manual regen when soot mass reaches approx 50 grams. OR Remove the DPF, straight pipe it and turn off the codes with your power up devices.

It's your call.
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Old 10-30-2007, 02:45 PM   #9 (permalink)
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Quote:
Originally Posted by Dmaxpower2 View Post
You are packing the DPF with soot.
P244B = DPF differential pressure too high. This code sets when the ECM sees a high "delta p" across the DPF as indicatied by the pressure sensor. The soot mass is usually over 90 grams.

P2459= Regeneration too often. This code sets when the average running time between regens is less 1 hour and 10mins. It will take 2-3 regens for the ECM to calculate the average running time between regens.

Now, you're not going to want to hear this, but here goes, the most likely cause is your power up devices. The ECM cannot calculate the added fuel. The modified air intake system is throwing off the MAF tables too, and now, the calculated vs Actual airflow is off. Thus, there's more soot in the DPF than the ECM calculated. In addition, the towing factor comes into play, towing = more fuel, the additional fuel means more regens.

Regens are base off of several factors they are:
Engine Run Time OR
Fuel Used OR
Miles Driven OR
Delta pressure OR
The Calculated amount of soot ( soot model)

Notice we are saying OR, each one of the above conditions when reach a calibrated threshold can trigger a regen. When power devices come into play the soot model, run time, fuel used and miles driven are now skewed. The only thing that's left that we can
rely on is the Delta Pressure. Once the delta p has reached the calibrated threshold DTC P244B sets and it's too late for a regen, the ECM will not trigger a regen because of the excessive soot accumulation. (safty net)

I heard that some of your power up devices can trigger a manual regen, if so, then monitor your soot mass parameter, and trigger a manual regen when soot mass reaches approx 50 grams. OR Remove the DPF, straight pipe it and turn off the codes with your power up devices.

It's your call.
thanks for all the info.
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Old 10-30-2007, 04:02 PM   #10 (permalink)
slowguy_63
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Up date

I waited before I did a repost, to give more then enough time and miles. Code# p244c has not retuned at this time.I have put about 1500 miles on it since, a trip towing a 28 ft. trailer,a trip empty, and some every day stuff. When this code set last time I was stock,no water in fuel light, no needs regen mesage. At this time, my only proublem is tring not to get a ticket while towing. Thanks to all that helped.
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