Check Engine Light Due to Failed Thermostat on Jeep Grand Cherokee

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: 73,922 (49,000–114,000)
Engines affected: 3.6L V6, 3.7L V6, 4.0L 6 Cylinder, 4.7L V8, 5.7L V8 HEMI
9 model years affected: 2002, 2005, 2006, 2007, more2008, 2009, 2010, 2011, 2012
25 people reported this problem
6 people shared problem details
2011 Jeep Grand Cherokee- 3.6L V657,432
Replaced 2011 jeep grand cherokee laredo 3.6 engine with a new thermostat and now wondering how many miles to drive to get the 'check engine light off?" Its time to get inspection and it still won't pass until I drive so many miles. Does anyone know how many miles to drive before I can go back and see if it will pass? No auto zone, advance auto nor Napa had the part in their computer and I had to go and purchase it at the dealer...$36.00. My husband put it in---in less than 30 min.
2009 Jeep Grand Cherokee- 3.7L V668,000
Changed thermostat 3 times already due to first overheating. Second time the engine does not warm up to right temperature causing check engine to come on. Thermostat replaced 2nd time and engine still did not operate right causing check engine lamp to come on again. Replaced thermostat again and now waiting to see if it will operate correctly this time. This problem began at 68,000 miles. My jeep only has 72,000 now.
2011 Jeep Grand Cherokee- 4.0L 6 Cylinder60,000
Check engine light on , dealer told us that the diagnostic code indicates that it is the thermostat , they want 436.00 to remove and replace, I questioned the price and they told me that that is the package. If did not feel like getting fix that it was going to be 125.00 just for the diagnostic.
2006 Jeep Grand Cherokee- 5.7L V8 HEMI52,000
replaced thermostat.
2011 Jeep Grand Cherokee- 4.0L 6 Cylinder76,464
Check engine light came on tested with obd n read coolant thermostat
2012 Jeep Grand Cherokee- 4.0L 6 Cylinder85,600
Engine light came on. Checked with OBD and stated bad thermostat.
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