LMM cold weather limp

[Big Block 88]

I have a buddy with an 09 LMM, and I have had to go rescue him 2 times now. It has barely been above 0*f here for the past week or two. He lets it warm up and keeps it plugged in but the truck will show engine power reduced and only go about 25 mph. I used my V-2 and there is no codes it is just in limp. Me and my other buddy are thinkin it is just the dpf getting to cold and maybe being a bit clogged?? Is there a way I can tell the truck to manually regen?? The truck is totally stock and he does everything right from my point of view, he doesn't run a cold weather front but then niether do I with the LBZ or LB7. Any ideas??

 

[redws6rocket]

have you guys had a bunch of snow? if so the air cleaner is plugged with snow. check it and if there is no snow then see if the filter is wet. chances air there was at one time snow in there. we are having alot of problems here with that. we are installing winter front covers, drilling holes in the air cleaner lid, and replacing the filter is gm's fix for this.

 

[Big Block 88]

yeah we have been hammered with snow this year we have 17 iunches on the ground here at my dads house and drifts over 7 foot. I'lkl give him a shout and see what he says about his filter. Thanks man

 

[wikdlmm]

yes you can manually regen with the ppe idk about the efi i havent looked on my trck bc i havent had a dpf for 60k

 

[bardene]

Also there is a bulletin about extending the MAP sensor for the LMM. It gets moisture on it in it's stock location and puts the truck into limp. Should have a code though.

 

[Big Block 88]

No codes at all, I will have him check on the map sensor and see about the service bulletin.