DPF Cleaning

Lately when my DPF cleaning occurs it seems to get stuck in cleaning mode. The only change recently was putting a locking fuel cap on truck.
Thoughts?

I suggest using a monitor to keep track of frequency, progress and level of success.

http://www.kennedydiesel.com/detail.cfm?ID=673

What parameters should be monitored on this device?

I would have to work through this with you on the LMM, but should be pretty similar to the LML and how I set mine up. Timing, soot, etc.