Check Engine Light Due to Failed Thermostat on Dodge Ram 3500

The thermostat may fail to close completely, causing the Check Engine Light to illuminate. This problem will prevent the engine from reaching normal operating temperature; a new thermostat should be installed.

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Average mileage: 88,000 (78,000–98,000)
Engines affected: 5.9L 6 Cylinder Diesel Turbo, 6.7L 6 Cylinder Diesel Turbo
8 model years affected: 2003, 2004, 2005, 2006, more2007, 2008, 2009, 2010
11 people reported this problem
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problem details
2009 Dodge Ram 3500 - 6.7L 6 Cylinder Diesel Turbo 98,000 mi,
Dodge Ram 3500 : Check Engine Light Due to Failed Thermostat
2007 Dodge Ram 3500 - 6.7L 6 Cylinder Diesel Turbo
I have had this issue with mine as well, I need to take it in to get it fixed.