any update on this? Did you get the truck fixed?
My truck got stuck a week ago and about 30 miles after getting pulled out the CEL came on, same p140c code. I was about 800 miles from home so i just reset it. It keeps coming back on and at seemingly quicker rates each time. I stopped at a dealership in Hays Kansas on the way back and they said that to diagnose anything would cost a minimum of 90 bucks because they claim o2 sensor is only covered on 36k mile warranty and i have 53k miles. Shouldnt the o2 sensor be covered in the 100k powertrain warranty, or at the very least, the emissions warranty?
How many O2 sensors are on this thing? I assume the sensor behind the cat and before the dpf is the O2 sensor? I checked it and all the wires look fine to me. Could have some water in that connection there but it looks like it needs a special tool to take it apart. Are there any other O2 sensors besides this one?
In any case, im back home now and plan to take the truck back to where i bought it for the DEF recal and see if they can check this while its in, but any input from you guys would be greatly appreciated.
btw when it got stuck, it wasnt burried or anything, the truck just slid into a ditch because the dirt road turned to soup in the rain.
Edit, found another thread that says diesels dont use o2 sensors and that this code could be because of poor egr flow. Is this true? If so, what would cause this? (i idle the truck A LOT but am always able to drive it on the highway for regens)
2015 Sierra 3500 Denali SRW long bed
2011 Sierra 2500 SLE - sold
Last edited by TX2011; 04-14-2012 at 08:48 PM.