Check Engine Light Due to Failed Thermostat on Dodge Ram 1500

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: 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
1 person shared problem details
2002 Dodge Ram 1500- 4.7L V8194,576
Had replaced thermostat with new Gates model within previous six months and 4,000 miles.
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