08 with sneeze, code P2452 and /or P244a and regen

BrunoWilimek · July 3, 2008

Got this truck yesterday. Code P244A continuous, no symptoms noted on road test, cleared code, did not return, reflashed to latest calibration. Visual inspection OK. Back today with P2452 Cont. and Pending. Cleared codes and road tested as per PP test. Sounded like plugged filter as truck whistling/hissing out exhaust on accel. Truck went into regen, code came back, truck had repeated sneeze at cruise(sounds just like a person sneezing). A second road test was normal- no more symptoms. Followed PP test for code P2452- no problem found-returned to customer, shortly after, he called back it was doing it again(sneezing and CEL back on). I asked about fuel and he didn't know specifics(they have a fleet and fill up at their depot), but he has been using Stanadyne additive. He also has an aftermarket air intake system(ARI) and dual tailpipes with air intake slots. The truck has only 4500km on it and he does mostly short trips. He is coming back tomorrow. Any tips for me? /forums/images/%%GRAEMLIN_URL%%/shrug.gif

GregKneupper · July 4, 2008

the first thing you need to do is get that exhaust and the air filter off of there. the air filter will definately cause your p244a. I am not sure of the p2452 but restoring the system back to stock would be a good start.

BrunoWilimek · July 4, 2008

Thanks, Greg. I already told the customer that, but he is a bit of a meathead. His last truck was an 03 6.0 that he modified up the wazoo. It had dual stacks(a big square hole in the floor of the box!),aftermarket air intake and a chip with a display screen. Every time the screen popped out a code,(no check engine lamp though)he would call me and I had to drop everything I was doing to find out the cause. I finally put a strip of electrical tape over the screen and told him not to call me again unless the check engine light came on. Most of the problems he had were of his own making, as he would disconnect/reconnect the chip from the PCM every time he brought it in for warranty work. The only reason we put up with him is the family has bought many vehicles from our dealership in the last 16 years and you don't bite the hand that feeds you, especially now that times are tough in the auto industry. Besides, it's a small town.

BrunoWilimek · July 4, 2008

I did some more research on the P244A. Seems the PCM does not look at the DP sensor pid until 5000km(this unit has 4500=close enough?). The causes list aftermarket equipment/performance equipment. The customer said he researched it on the internet and found some site that says they all do it(yeah right!)and it is caused by a sensor or a pinched wire or something that causes a ticking noise at 20,000km.(Huh? his only has 4500 and no ticking noise!), so I googled the 2 codes and found several sites that listed those codes but most seemed to think the air intake was at fault. Seems the stock "Donaldson" filter is still the best.(according to them anyhow) I told the customer he had to return it to stock and then I can test it further. We will see what happens now.

Steve Mutter · July 5, 2008

love that type of customer,I had one that would read the internet and tell me what parts to replaced on this tow truck,I hope returning the truck to stock clears up the problem

GregKneupper · July 5, 2008

run oasis on this truck for the cel being on and you will find a ssm that specifically states that aftermarket air and exhaust systems will cause this problem. I would show that to him.