steeler Posted 4 hours ago Share Posted 4 hours ago 2021 mp8. The truck came to us for not completing a regen. Using tech tool I start the regen but it never commands the hi to start dosing. Engine idles up, exhaust temps look good in the 550's and I can see the ahi module go thru it's checks.. Then it just sits there. Never starts dosing. Before it came to us it had new injectors, turbo, manifold, and the entire 1 box is new.. I'm getting, or maybe I already am.. Stumped! Quote Link to comment https://www.bigmacktrucks.com/topic/76085-strange-regen-problem/ Share on other sites More sharing options...
fjh Posted 2 hours ago Share Posted 2 hours ago 1 hour ago, steeler said: 2021 mp8. The truck came to us for not completing a regen. Using tech tool I start the regen but it never commands the hi to start dosing. Engine idles up, exhaust temps look good in the 550's and I can see the ahi module go thru it's checks.. Then it just sits there. Never starts dosing. Before it came to us it had new injectors, turbo, manifold, and the entire 1 box is new.. I'm getting, or maybe I already am.. Stumped! I wonder if the previous part putteroners did relearn data resets ! just thouing that out there! Quote Link to comment https://www.bigmacktrucks.com/topic/76085-strange-regen-problem/#findComment-584882 Share on other sites More sharing options...
steeler Posted 39 minutes ago Author Share Posted 39 minutes ago 2 hours ago, fjh said: I wonder if the previous part putteroners did relearn data resets ! just thouing that out there! Yeah that was my first thought. I reset everything with no luck. Swapped ecu with a different truck, still nothing. Getting ready to swap acm and try that! Quote Link to comment https://www.bigmacktrucks.com/topic/76085-strange-regen-problem/#findComment-584885 Share on other sites More sharing options...
fjh Posted 9 minutes ago Share Posted 9 minutes ago I’m not very familiar with these and getting more distanced I’m fortunate to be retired from this up and coming mess!just throwing stuff up I had heard around the shop! Also was there not a check valve down stream that was troublesome? Quote Link to comment https://www.bigmacktrucks.com/topic/76085-strange-regen-problem/#findComment-584889 Share on other sites More sharing options...
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