want to know more about fault code 2637

[DVT873]

No 7th injector. In cylinder dosing. Customer choice on DOC. Vendor that supplied DOC does DPF and DOC cleaning and nothing else. They have been at it about 5 years now. They log and save arrival, intermediate and final flows on all units. Do several thousand a year. Have had overall good service but of course mileage varies. Understand the potential difference between OE and others. I do not trust any reman DOC, even OEM. So it has to be new. Medium duty is a bit different than on highway longhaul. The truck in this post won't see 10K a year. Maybe not even half. I do the best I can to lay out options but can't forcibly spend someone else's money. That said I appreciate what I have learned and still learn on this site. Thanks to all.