want to know more about fault code 2637
01-03-2021, (Subject: want to know more about fault code 2637 ) 
Post: #1
want to know more about fault code 2637
ISC CM2150 ESN 46817049 2008 M2 Freightliner 1FVACWBS98DZ89079 Cummins code 2637 QuickServe says this is an inferred code. It refers to the three aftertreatment temp sensors. Doesn't say much else. Have had this code come up a few times Then a soot level light will come. on. It says while 2637 is active, active regen is stopped. Twice inspection of the DOC has showed a clean face.

Last time this happened it was a pretty cold day. Maybe 15 degrees. Truck had plowed and salted parking lots for about 10 hours. Set 2637 and 2639 but did not shut down. Cleared 2637 and ran a regen. Regen got to 1400 degrees on the outlet side. EGR tuneup has been done recently. DPF was replaced, the old one appeared original but had a crack.

That was back on Dec 26th. No problems since. Want to get connected to it this week to check regen history. About 10,000 hours on engine. No evidence of demandate or hotrod programming.

Anyway I would like to know more about what goes into the ECM deciding to set 2637.
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want to know more about fault code 2637 - DVT873 - 01-03-2021



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