DRIVE TO CLEAN MESSAGE ????
FTE Legend
Joined: Mar 2017
Posts: 31,880
Likes: 9,172
From: Western NY
The regens are triggered by a differential pressure sensor on the DPF (besides mileage based regen), and have nothing to do with the temp sensors. On the upstream side, it is seeing full exhaust pressure. On the downstream side, it is seeing whatever density altitude you are in at the time. At high altitudes, with low humidity and high temps, the sensor gets confused because of the density altitude being higher, while the pressure on the upstream of the DPF is the same. It sees this as extreme plugging of the DPF and triggers the "DPF Full - Drive to clean" message. This is why at those same altitudes on a cooler day, or when not towing and creating tons of exhaust flow, you won't see that message. The sensor simply doesn't have enough sensitivity in the atmospheric side. Obviously, the temp sensors come into play when the ECM is monitoring the burn in the system, but are not directly creating the need to drive to clean. Maybe a reflash can correct the sensitivity of the differential pressure sensor.
Great explanation, Doug...thanks for that.
FTE Legend
Joined: Mar 2017
Posts: 31,880
Likes: 9,172
From: Western NY
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Logistics Pro
Joined: Nov 2001
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From: Georgia
Just an update on this issue. I left Cody without a re-flash and have towed across Yellowstone through the Tetons and over a couple passes to the western slope of CO. I've not had another occurrence of the DRIVE TO CLEAN message. Of course neither have I had any hot temps. I have noticed several cleanings while not towing but have not caught one while towing. I have only one more pass to climb on route 50 to the east side. After that it's mostly flat land to Georgia. So, as of now everything is back to normal. I will still get the flash done when I get home. Unless something happens as I cross the mountains I consider this item complete.
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