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Truck was fine Saturday ,it sat over rest of weekend and this morning I decided to drive it too work and low coolant message came on twice in 1st mile. I dismissed it and this afternoon it ran fine I remote started it and when got to it and put key in there was no warnings. I wondered if it was just cause of it being 20 this morning and this has been the first time driving it this cold ? Checked tank when I got home and it was at the full level I hope it’s ok. I haven’t had block heater recall done yet mainly because I didn’t want them to mess up something doing that. It’s just way my luck goes
 

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wouldn't worry, pry right on the add mark once warm is rises. if you want add a bit . sometimes when its cold some of the clamps may leak a bit.
 

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got no idea what to say because we got no idea what you have, fill out yoru signature......................
 

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Truck was fine Saturday ,it sat over rest of weekend and this morning I decided to drive it too work and low coolant message came on twice in 1st mile. I dismissed it and this afternoon it ran fine I remote started it and when got to it and put key in there was no warnings. I wondered if it was just cause of it being 20 this morning and this has been the first time driving it this cold ? Checked tank when I got home and it was at the full level I hope it’s ok. I haven’t had block heater recall done yet mainly because I didn’t want them to mess up something doing that. It’s just way my luck goes
Full to the line when the coolant is warm means it's low when the coolant is cold. The tank level indicators are for cold coolant -- since it needs to be cool/cold when the cap is removed....

Add enough to be at least at the the full line when it is cold.


Don't forget that the cap on L5P is left hand thread!
 

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It is likely due to the change in weather. There is a TSB for low coolant https://www.duramaxforum.com/forum/l5p-tsb-service-bulletins-recalls-updates/893042-l5p-bulletins-recalls-updated-calibrations-3.html#post11062898 (post 26)

I had mine in last week for a replacement surge tank but I got the light every day after driving 6 to 10 miles. The tank sensor seems to be a common failure and requires the entire tank to be changed out.
Dealer says tank should be to the bottom of the filler neck when warm.
 

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Dealer says tank should be to the bottom of the filler neck when warm.
I think maybe the service advisor needs to read the diesel supplement for an L5P.


cut and paste:

Checking Coolant (6.6L 8-Cylinder Engine Pickup Models)

The coolant surge tank is divided into two sides.
The upper portion coolant level should be at or above, the bottom of the indicator arrows.
The coolant level must be checked when the engine is cold and the vehicle must be on a level surface.
The lower portion will be mostly empty, depending on the operating temperature.



In any case, it won't hurt to have more, and that should prevent the low coolant sensor from tripping.

I might hurt not to have it full enough, and to be in the habit of ignoring the coolant level sensor.
 

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Discussion Starter #8
Full to the line when the coolant is warm means it's low when the coolant is cold. The tank level indicators are for cold coolant -- since it needs to be cool/cold when the cap is removed....

Add enough to be at least at the the full line when it is cold.


Don't forget that the cap on L5P is left hand thread!
Yeah. Liked to never got cap off
 

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Got my sig filled out. Don’t know why it doesn’t show up. But truck is 17 Duramax
 

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got no idea what to say because we got no idea what you have, fill out yoru signature......................
Sig showed up after last post?'dunno;
 

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Discussion Starter #13
Anyway I figured it was just cold weather thing. I haven’t checked since. I will tomorrow check level.
 

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Got my sig filled out. Don’t know why it doesn’t show up. But truck is 17 Duramax
Once you fill out your sig, only the posts posted after that will show the sig. All of your previous posts before the fill out, will all remain blank as before.
 

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Truck was fine Saturday ,it sat over rest of weekend and this morning I decided to drive it too work and low coolant message came on twice in 1st mile. I dismissed it and this afternoon it ran fine I remote started it and when got to it and put key in there was no warnings. I wondered if it was just cause of it being 20 this morning and this has been the first time driving it this cold ? Checked tank when I got home and it was at the full level I hope it’s ok. I haven’t had block heater recall done yet mainly because I didn’t want them to mess up something doing that. It’s just way my luck goes
Got the same issue when temps have been in 20’s but only comes up once every couple days. Res is full. When it’s warmish (30 +) outside no message.
 

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Its the sensor, they have to replace the surge tank. Just had mine replaced on my 2017 had about 81,000 miles on. Not a covered under warranty. I would get the same thing for a bit and then it would go away for a while and then pop back up. It is happening to a lot of them the parts were on back order for all most a month.
 

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Well, my '18 started giving me the low coolant warning a couple weeks ago. It had about 49K miles on it. I took it into the dealer. Previously it was serviced to address the related TB. The mechanic found a small leak out of the water pump's weep hole. They replaced the pump. I got the truck back this past Monday. Since I have had the low coolant warning twice. The first time, it took 3 pints to fill it to the mark when it was cold. I got the warning again today and it took another pint +. The level did appear low both times and both times it was cold. So, I am not convinced my problem is the sensor. It could be that they did not get all the air out of the system when they changed the pump. But my '08 max never gave me any issues with over 250K miles on it. Kind of disappointed in the LP5. One more low coolant warning and its back to the dealer.
 

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Discussion Starter #18
Once you fill out your sig, only the posts posted after that will show the sig. All of your previous posts before the fill out, will all remain blank as before.
I’ve had it filled out long before I made my post on low coolant. Then next post it came up don’t know why must been a glitch
 

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They have a problem with air in the system and it will create a bubble around the sensor. Dealership will bleed the air and you’ll be good to go. Mine did the same thing
 

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Discussion Starter #20
That’s good to hear. But I still haven’t driven truck since that day. Today the weather is sucky but I’m gonna look at it Saturday if I can
 
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