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Grand Cherokee
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Check Engine Light Due to Failed Thermostat on Jeep Grand Cherokee

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: 80,481 (8,000–273,000)
Engines affected: 3.6L V6, 3.7L V6, 4.0L 6 Cylinder, 4.7L V8, 5.7L V8 HEMI
11 model years affected: 2001, 2002, 2005, 2006, more2007, 2008, 2009, 2010, 2011, 2012, 2016
67 people reported this problem
Comments
Viewing 1 - 20 of 21 comments
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.
Check engine light came on tested with obd n read coolant thermostat
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.
Code P0128......took it into the dealership and was told it was the thermostat. Over $400 repair. The car didn't overheat or run any differently before or after the check engine light came on.
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.
Check engine light came on at 8000 miles. Took to dealer they said failed thermostat. In shop overnight no parts in Stock. Still there now.
Went to get the jeep inspected and as soon as we pulled into the shop the cel came on. The code was for coolant temp to low , replacing the thermostat tomorrow
Engine light came on. Checked with OBD and stated bad thermostat.
replaced thermostat.
Engine light appeared- replaced thermostat, it cost 22.99 at O'reileys
Labor $40 at local repair shop, took them 15 mins to do the work
My thermostat housing busted and now I think I blew my motor
Thermostat was causing Malfunction light to come on. It is not keeping the engine temp warm enough.
Check engine light came on last week, said thermostat issue of some sort. Took to the dealership, they said it wasn't showing up anything in the system but they updated the computer. Came back on, my husband took it in and it said the same thing but they said it's probably the weather. THEN, we're getting the message "engine temperature too high" and the light for the temperature over heating on with no reading. Pulled over to stop a few times because the heat also wouldn't work. Start it up after a few and it's ok for like 5 minutes. Then the "service electronic throttle control" message came on with the accompanying light.... took it back to the dealership again, the kept it for the night "checked everything" and said a hose was loose and it had a slow leak so that must be it, they couldn't find anything else.... came on AGAIN, the next night.. took it BACK TO the dealership the guy said it was NOW throwing a different code, and the thermostat needs replaced. So we shall see what happens, supposed to get it back today! I am irratated because I bought a BRAND NEW vehicle so that I wouldn't have to worry about anything other than routine maintenance.. & this is the second major issue we have had...
My check engine light has been going on for about 2 years because of my gas cap and I've always had to wait till it cleared itself. This time it did not clear and I took it in and it's the thermostat, I was told that they've had several com in with this issue and looking in line it seems as though this is an ongoing thing!!!!
Emission control light came on. Diagnosed as a thermostat issue. $350 at the dealership.
Just Cherokee
Just diagnosed while on vacation. To be fixed when I arrive home.
5.7 hemi 2012
Engine running cold now changed water pump an thermostat last year running fine .started running cold in the summer and winter. So I changed T stat still running cold .try ed to get inspected but failed for 1281 t stat. On my computer obo said all ready reset code 1282 now it said 3 ready not ready was 02 sensor cat could it be the sensor coolant on the thermostat now .on computer said o codes 3 ready 4 not . I have a tiny leak in the radiator. I let sit for 5 min drive it still running cold .keep cap off and let heat up but gauge stay at 100 .I know the engine is hot enough. But still running cold if the radiator leaks a little very seldom cause it to run cold .thanks
the car has a 3.6 L engine. (Not able to select)