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+--- Thread: CM 871 Code 2639, DPF won't clean (/showthread.php?tid=4236)
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RE: CM 871 Code 2639, DPF won't clean - Doops22 - 03-08-2019
Sitting at an idle at first startup was 0.35psi and after a 5 mile drive showed peak delta p of 0.74
RE: CM 871 Code 2639, DPF won't clean - Rawze - 03-08-2019
(03-08-2019 )Doops22 Wrote: The filters were cleaned and baked. Is that high enough to trip the light? Maybe the DPF delta P sensor is bad?
don't forget that the crossover tubes for the DPF Delta-p can get partially clogged and make it read high too. Also it can read wrong if the rubber bushings at its feed-point get cracked/leaky.
Lastly, if you had the DPF and DOC baked out, you need to perform a "DPF Maint. Reset" or whatever its called in Insite.
RE: CM 871 Code 2639, DPF won't clean - Doops22 - 03-08-2019
I blew the tubes out with shop air while it was apart and I put new rubbers where the steel tubes meet the sensor.
I didn’t know about the reset on insite I guess I’ll have to find someone to do that.
RE: CM 871 Code 2639, DPF won't clean - DosGatos - 03-08-2019
Curious which test strips you have
RE: CM 871 Code 2639, DPF won't clean - Unilevers - 03-08-2019
.75 psi is like 1.5 inhg. Well not obscenely high that is more than i would like on cleaned filters.
It is not enough to trip the light yet, but hopefully it doesnt go up more.
RE: CM 871 Code 2639, DPF won't clean - Doops22 - 03-08-2019
The test strips I used were Fleetguard CC2602. I attached the test from quickserve.
Uni: thanks for the info. I’ve made an appointment Monday at a local Cummins dealer to have them plug in with insite and do the DPF reset and check things out. I don’t think I can do much more without a laptop unfortunately.
RE: CM 871 Code 2639, DPF won't clean - Doops22 - 03-15-2019
Quick update I took it to a shop that could plug into it, unfortunately I wasn’t able to take it down. They weren’t able to get the light out but on the way home it went out and hasn’t come back on. Thanks for the help!
RE: CM 871 Code 2639, DPF won't clean - Marajin - 03-17-2019
easy to clean dpf. use drill + chisel on doc,dpf,scr can too. re-program ecm and finally go make money with truck. :big_smile: