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Do a forced regen on the truck if there are no other codes. If there are other codes, then they need to be corrected first. If this is the only code, do a forced regen and monitor the flame temp sensors. Verify that they are getting high enough. MP7 engines should be floating around 2,000 degrees on the inlet/pre-filter side and 1600 degrees on the outlet side. If the temps are lower, there is another fault in the regen system.
Usually when I see this code, a forced regen will resolve the issue. If it doesn't, the air valve that feeds the atomizer module is usually bad. It isn't sending enough air to give a good fuel/air mixture for the regen to perform properly.
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