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  #1  
Old 09-29-2015, 12:38 PM
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P0128 code coolant temp low

Hi, I have a 2011 3.6 GC and for the past month or two about every once a week or so my Check Engine light came on. It would turn off by itself a day or so later so I never checked it, until now.

This morning I have a P0128 for coolant temp being low. It has not gone away yet and I do not know if this is the same code as before, because I did not check.

Last Friday I installed the Diablo 93 canned tune and I know I read something about the fan staying on. Not sure if that is the issue this time. I am going to check anti freeze tonight.

Any other thoughts, besides replacing thermostat or sensor. And if it is those two what order to go in?

thanks

rob

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  #2  
Old 10-01-2015, 08:34 AM
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Re: P0128 code coolant temp low

Hi Rob

I'm in the same boat, have the p0128 code maybe 1-2 times a week in the morning only. Going to look into replacing the thermostat first.
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Old 10-01-2015, 08:45 AM
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Re: P0128 code coolant temp low

Mine came back on yesterday driving down the highway with it being 70 or so very humid and therefore A/C was on. I don't use A/C much so not sure if tied to that or no. I might try thermostat as well soon. Let me know how it goes. I have 88k on car.

I see you have a lockpick. I have looked into that. I have the 730N RER radio and would like the ability to enter directions while moving, especially when the passenger is in the car. And also show album art and maybe use a USB for music playback instead of the ipod classic which works good but sometimes loses communication and can be finicky.
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Old 10-01-2015, 09:28 AM
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Re: P0128 code coolant temp low

I havent used ac in the morning for a while, just the fan, so not related.

Havent been able to find a pdf instructions on changing the thermostat on the 3.6 yet, please let me know if you do. I'm sure changing it is easy, I'm just worried about bleeding the system of air.

Yes love the lockpick, always travel with wife/kids, so much easier when she can enter directions. We have a sienna that we made some road trips in this year, and what a pita it is not being able to enter when you're moving...
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Old 10-02-2015, 09:43 AM
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Re: P0128 code coolant temp low

The same problem in my car. P0128 code. I just decide to replace the coolant sensor first. Then if the problem still existing I will replace the thermostat.
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Old 10-05-2015, 06:47 AM
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Re: P0128 code coolant temp low

P0128 sets when it takes longer than normal for the engine to reach operating temperature. Generally caused by a thermostat that is partially stuck open and/or low engine coolant.

If there is a problem with the coolant temperature sensor, there are several trouble codes that can set for that as well.
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Old 10-05-2015, 08:25 AM
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Re: P0128 code coolant temp low

So Ratchet, in your opinion replacing t-stat would be the first option over the sensor?
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Old 10-05-2015, 10:03 AM
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P0128 code coolant temp low

Quote:
Originally Posted by rlefig View Post
So Ratchet, in your opinion replacing t-stat would be the first option over the sensor?

The easy way in replacement should be the first option. As the cost approximately the same between the thermostat and sensor.
In my opinion, I will start replacing the sensor first.
Let's hear from Ratchet.
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Old 10-06-2015, 06:52 AM
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Re: P0128 code coolant temp low

rlefig: Yes, P0128 is thermostat rationality. I see this almost on a daily basis on these 3.6 engines. I would definately replace the thermostat first. The repair is very simple.

Note: There is no need to completely drain the engine coolant. You will lose a small amount during the thermostat housing R&R. However, there are a few specific steps that must be performed during the refill process. The steps should be available on WK2jeeps. If not, I can forward them to you.
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Old 10-06-2015, 07:25 AM
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Re: P0128 code coolant temp low

Thanks Ratchet, I will try and find the procedure on wk2jeeps. I have read that we need special coolant so of course get that as well. Any particular t-stat best for the 3.6?
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Old 10-06-2015, 07:26 AM
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Re: P0128 code coolant temp low

Also would the check engine light cause remote start to be disabled. The last couple of days have been cooler and when I attempt to remote start I see "remote start disabled on EVIC". It did work last winter. I will clear the code and try again
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Old 10-06-2015, 07:48 AM
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Re: P0128 code coolant temp low

Yep. If the MIL is on, remote start will be disabled.

Save yourself some headache and get the thermostat/housing from the dealer. Should be around $35.
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