My 2013 2609 CEL came on.
Checked the grid heater bolt and it was loose. I shut the truck down and removed it that day. 127K miles on the truck.
If you decide to keep it stock and replace with a new Cummins heater make sure you check the Torque on the inner bolt before installed.
The heater grid maintenance is required i think every 60.000 miles anyway for cleaning. Just replace it.
This took 2 days to get to me. I live in the North Pole it helps LOL.
https://www.ebay.com/itm/25427698447...m=254276984473
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