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Check Engine Light Due to Failed Thermostat on Dodge Ram 1500

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 168,355 (111,001–207,980)
Engines affected: 3.7L V6, 4.7L V8, 5.7L V8 HEMI
9 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009, 2010
15 people reported this problem
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Had replaced thermostat with new Gates model within previous six months and 4,000 miles.