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  #13  
Old 10-06-2015, 08:52 AM
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Re: P0128 code coolant temp low

Thanks again Ratchet will get coolant and T-stat from dealer.

Hope you are all not in the flooding rain that has been occurring in the Carolina's

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  #14  
Old 10-06-2015, 09:32 AM
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Re: P0128 code coolant temp low

No problem.
As for flooding, we got lucky this time. Only a few inches of rain fell here. Back in 99, my entire town flooded. Not fun wading through chest deep water in your living room. It can be fun to ride a jetski through your house though.
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  #15  
Old 10-06-2015, 10:43 AM
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Re: P0128 code coolant temp low

Ratchet if you could forward me the link on t-stat changing from wk2jeeps that would be great. That is a good site never been there before
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  #16  
Old 10-06-2015, 10:56 AM
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Re: P0128 code coolant temp low

After you have bolted up new thermostat... cliff note version.

-Remove bleeder screw on top of thermostat housing.
-Proceed to refill radiator with proper coolant mixture (50-50).
-Pause the refill procedure when a steady stream (no air bubbles) comes from the bleeder vent.
-Reinstall and tighten bleeder screw on thermostat housing.
-Continue to top off coolant level in radiator.
-Install radiator cap.
-Top off coolant level in recovery/overflow tank to the left of radiator.
-Start engine (make sure AC is OFF) and let idle untill it reaches operating temperature and electric cooling fan cycles on.
-Shut off engine and let cool for several hours.
-Top off coolant recovery tank if needed.
-Done.
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  #17  
Old 10-07-2015, 11:35 AM
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Re: P0128 code coolant temp low

Thanks Ratchet,

Got the thermostat from dealer for $44 was going to get anti-freeze from there but it was $24 which seemed like a lot at the time. But now doing more research and seeing that the Zerex G-05 is really the only sub and that was $18 at local store then maybe $24 is not so bad.
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  #18  
Old 10-11-2015, 04:26 PM
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Re: P0128 code coolant temp low

thermostat replaced, it came with the housing. Upon removing the old t-stat I broke the lower bolt. Luckily there was enough bolt left to PB Blast and vice grip it out. That process took about 2 hours as I wanted to be wicked (ok very) careful. Once I got that out it took about a gallon of coolant/water. I drained it some of it before hand which amounted to a gallon and 6 ounces. will check coolant level again.

Hope this fixes the P0128 code.

Thanks Ratchet and all who offered their time and advice
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  #19  
Old 10-12-2015, 07:33 AM
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Re: P0128 code coolant temp low

No problem. Glad we could be of service to you.
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  #20  
Old 10-12-2015, 11:28 AM
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Re: P0128 code coolant temp low

Getting here late but for me the first thing would be to get a scan tool and find out what the temperature really is (with an Android tab or smart phone all you need is Torque Pro ($5) and a Bluetooth dongle ($12)). Then see what the radiator hose feels like (warm/cold/hot) when it comes on.

I'm thinking about changing to a 180F thermostat and am curious at what temperature the low temp error is set.
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  #21  
Old 10-13-2015, 07:57 AM
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Re: P0128 code coolant temp low

padgett, here's what I have to go on regarding condtions for the P0128 to set.

When monitored: With the engine running, ambient temperature between 8C(17.6F) & 50C(122F), startup coolant temperature less than 50C(122F) and average vehicle speed greater than 16KPH(10MPH), untill the vehicle untill coolant temperature reaches 85C(185F).

Set conditions: The PCM detects that the actual coolant temperature falls too far below the predicted engine coolant temperature and the predicted engine coolant temperature reaches the predicted target value before the actual coolant temperature reached the actual coolant temperature target value. Two trip fault. Three good trips to turn off MIL.

Possible causes: The top two are most common.
-Low coolant
-Thermostat open
-Temperature sensor
-Signal circuit open
-Signal ground circuit open
-Signal circuit shorted to ground
-Signal circuit shorted to the (K900), (G931) sensor ground circuit
-Powertrain control module (PCM)
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  #22  
Old 10-13-2015, 08:34 AM
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Re: P0128 code coolant temp low

Tourque is a great app, not sure how much it would have helped since mine was so random coming on and then I believe would stay on for X (maybe 100 or 50) amount of miles and then the check engine light would clear. 2-5 days later it was back on.
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  #23  
Old 10-21-2015, 04:27 PM
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Re: P0128 code coolant temp low

after almost 2 weeks the P0128 code has not returned (knocking sound on wood) so hopefully it is resolved with the t-stat change
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  #24  
Old 10-21-2015, 09:33 PM
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Re: P0128 code coolant temp low

Good deal. Usually when that code starts to appear, the thermostat will stick open intermittently untill eventually it will remain stuck open.
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