P2196 and severe cold operation question

[DonFitzwater]

I've got a 2010 6. 7 automatic, quad cab 3500 that keeps having P2196 code pop up. Dealer has updated software as per the TSB. Problem keeps coming back and the dealer is backed up for a bit. My question is this, will my truck still be able to regen and not do any permanent damage to the exhaust system while I'm driving it? The weather here is -40 and colder for the time being and I just want to know if I should park it until the dealer can get to it.

 

[HBarlow]

Most of us don't have any idea what code P2196 means. Has the dealer told you what the code indicates the problem is?

 

[Bob4x4]

That tSB was only recently released. Prior to that engineering had to send parts out as needed. The o2 sensors need to run parelel on decel if they do not both o2 sensors should be fresh and drive again. That will normally take care of it if the other diagnosticss do not lead to a fix

 

[Wayne M.]

I found P2196 on a VW TDI site. http://forums. tdiclub.com/showthread.php?t=252114
Though any OBDII code beyond P0XXX is manufacturer specific, it's safe to say here that it means that an o2 sensor is rich. Going off my experience in class 8 DPF's I'd say any fault will inhibit a regen. Back to the VW website, they were dwelling on EGR problems and smoke. Are you seeing any of that? Also, just because you're getting the code dosent mean the o2 is at fault, it's just reporting it. For example, a gasoline engine will report a lean o2 if the fuel pressure is down, clogged injector, or a manifold leak- there wont be a problem with the o2 itself.

Are you seeing smoke? do you suspect a problem with the EGR? How many miles do you have? Are you due for the EGR cleanout?

 

[DonFitzwater]

No smoke, no poor running whatsoever. The light came on, truck went to dealer and was reprogrammed per TSB. Just broke 37k miles.

Harvey, the DTC is listed as O2 sensor fault.

 

[Bob4x4]

Wayne. You might want to read my post

 

[Wayne M.]

Wayne. You might want to read my post

I did read it. I'm not privvy to the TSB. I'm not quite getting your o2 logic. Are you saying they should go even/ flat on decel? I know on my particular drive cycle, that would be hard. Not too much decel. Usually when o2's are in tandem, they're looking for a contrast before and after...

 

[Bob4x4]

They must have no more than 4% variance on Decel-0 fueling. That is what trips the Dtc. The tSB replaces connectors to be sure they are not the cause

 

[HBarlow]

No smoke, no poor running whatsoever. The light came on, truck went to dealer and was reprogrammed per TSB. Just broke 37k miles.

Harvey, the DTC is listed as O2 sensor fault.

If the truck was mine and I needed it for transportation and travel distances were going to be relatively short I would probably drive it for a few days until the dealer service department could get it in. My guess is an 02 sensor condition is not likely to cause damage. I would not drive it long distances though.

I think Bob above would be a better source of advice on this than I am because he works on them and is familiar with them. I may be giving you bad advice.

I have never had a CEL on my '08 C&C. Well, actually I had one several years ago that lasted until I got the truck to the town where my selling dealer is. The CEL then cleared itself before I showed up in the service drive. The cause was later eliminated by a reflash and I've never had another one. My understanding was that the original software parameters for monitoring rail pressure was troublesome and was revised by the reflash.

 

[DonFitzwater]

I'm planning a trip this weekend and it's going to be around 1k miles round trip, this is why I was asking about it.

 

[Wayne M.]

I'm planning a trip this weekend and it's going to be around 1k miles round trip, this is why I was asking about it.

If Cummins patterned their strategy like the big stuff, and you're running a fault, Id bet you'll wind up with a plugged DPF in a thousand miles. Good luck.

 

[Wayne M.]

I'm planning a trip this weekend and it's going to be around 1k miles round trip, this is why I was asking about it.

If Cummins patterned their strategy like the big stuff, and you're running a fault, Id bet you'll wind up with a plugged DPF in a thousand miles. Good luck.

 

[Bob4x4]

If it were my truck and I had no access to anything I would remove and clean both o2 sensors and clean them with compressed air only. Reinstall them,a few Hail Marys and have a safe trip

 

[mwilson]

I did read it. I'm not privvy to the TSB. I'm not quite getting your o2 logic. Are you saying they should go even/ flat on decel? I know on my particular drive cycle, that would be hard. Not too much decel. Usually when o2's are in tandem, they're looking for a contrast before and after...

Just for the sake of argument, wouldn't they have to match on a decel???



There shouldn't be anything coming thru in the no fuel condition so nothing in equals nothing out or am I missing a step??



Mike

 

[DonFitzwater]

I'm going to roll with it. It's supposed to warm up above zero by tomorrow and if it plugs, it's the dealers baby. They told me it'll be fine to run until they get caught up. Truck runs great and after reading the sticky about regens, I finally realized when it happens. Had a regen on the way home. Thanks for the replies.

 

[Wayne M.]

Just for the sake of argument, wouldn't they have to match on a decel???

There shouldn't be anything coming thru in the no fuel condition so nothing in equals nothing out or am I missing a step??

Mike

I'd love to do some graphing and see. I know in gasoline o2 pre and post cat situations the change is rather quick, but it never goes completely flat, and hardly ever matches as the cat is most always bedding oxygen. However I'm comparing apples and oranges. Also, I don't know how the diesel EGR plays into this, if it's leaking etc. how it would effect o2's

 

[Wayne M.]

I'm going to roll with it. It's supposed to warm up above zero by tomorrow and if it plugs, it's the dealers baby. They told me it'll be fine to run until they get caught up. Truck runs great and after reading the sticky about regens, I finally realized when it happens. Had a regen on the way home. Thanks for the replies.

You're saying you had a regeneration with a fault/ check engine lamp on?

 

[Bob4x4]

Wayne not all faults stop regen on the rams. The 02's on the ram are there to help control the egr not the fueling. They do not look like gassers as you monitor them. I learned many years ago to not try and think of diesel ops the same as gass

 

[DonFitzwater]

Yes, I'm fairly certain the truck regen'd on the way home last night. Slight roar in the exhaust and felt like it had a little extra power leaving stop lights. It was back to normal by the time I got home (20 minutes or so)

 

[Bob4x4]

Your dealer screwed up. There is some wiring that needs to be done