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  #49  
Old 08-07-2016, 09:23 PM
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Re: P0128 code coolant temp low

Just recently acquired a 2012 Jeep Grand Cherokee Overland. Not long after, I got the P0128 code. Following seeing this thread and replacing the thermostat, it appears to be fixed. Thanks for the help.

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  #50  
Old 08-20-2016, 11:12 PM
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Re: P0128 code coolant temp low

May not be correct but I have a '97 GC ZJ 4.0L 4x4. My mechanic told me not to reset the error code as the computer board requires 3 consecutive errors before the check engine light goes on and throws a code. He said to copy all error codes and as long as I'm aware of the problem and watching my gauges I should not reset the codes. It will allow any other codes to be triggered that can help to narrow down the problem further if a new code appears.
I'd verify this with a good Jeep Mechanic to be sure the advice is valid. The check engine light isn't going to make it worse, it's just warning you something is wrong so resetting the code without fixing the problem may be hiding other codes that have not appeared yet.
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Old 08-20-2016, 11:46 PM
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Re: P0128 code coolant temp low

That's almost correct. My research indicated that it takes two P0128 faults to cause the check engine light to come on. Then, after the repair, it takes 3 good cycles from a cool engine to a warm engine in the allotted time to turn off the check engine light. Following my thermostat replacement and 3 good cycles, the check engine light turned off and has not returned. Resetting the code just prolongs the results.
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  #52  
Old 11-29-2016, 04:48 PM
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Re: P0128 code coolant temp low

didnt read this til i was done. let the bleeder valve bleed a few times before and after running. fluid level in the reservoir is good when the engine is hot and cold. how long does the check engine light take to turn off? its been almost 2 days, should i have patience or bleed the system like you said to?
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  #53  
Old 11-29-2016, 05:24 PM
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Re: P0128 code coolant temp low

I think mine took about 4 days, but I don't drive much. It takes a certain number of good cycles from cold to operating temperature to turn the light off.
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  #54  
Old 11-29-2016, 05:37 PM
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Re: P0128 code coolant temp low

Quote:
Originally Posted by tkoz0886 View Post
didnt read this til i was done. let the bleeder valve bleed a few times before and after running. fluid level in the reservoir is good when the engine is hot and cold. how long does the check engine light take to turn off? its been almost 2 days, should i have patience or bleed the system like you said to?
Strange, I didn't get the check engine light again immediately after changing the thermostat.
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Old 11-29-2016, 07:02 PM
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Re: P0128 code coolant temp low

That was my experience also. Then, the next morning it came back on. Further research gave me the information about the cycles needed to turn it off again. Anyway, whatever the number of cycles was, either 4 or 6, it went out exactly as planned and hasn't returned.
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