Low coolant warning this morning - Chevy and GMC Duramax Diesel Forum
2017-19 GM T-K2 Platform Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 21 (permalink) Old 01-20-2020, 03:21 PM Thread Starter
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Low coolant warning this morning

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 itís ok. I havenít had block heater recall done yet mainly because I didnít want them to mess up something doing that. Itís just way my luck goes
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post #2 of 21 (permalink) Old 01-21-2020, 03:07 AM
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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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post #3 of 21 (permalink) Old 01-21-2020, 03:42 AM
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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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post #4 of 21 (permalink) Old 01-21-2020, 09:35 AM
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Quote:
Originally Posted by Pappyt2 View Post
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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2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY

Last edited by redwngr; 01-21-2020 at 09:38 AM.
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post #5 of 21 (permalink) Old 01-21-2020, 02:57 PM
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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/l...l#post11062898

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.

2018 Denali. 6 inch BDS Lift on 325/65R20s
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post #6 of 21 (permalink) Old 01-21-2020, 02:59 PM
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Originally Posted by USN DMAX View Post
It is likely due to the change in weather. There is a TSB for low coolant https://www.duramaxforum.com/forum/l...l#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.

2018 Denali. 6 inch BDS Lift on 325/65R20s
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post #7 of 21 (permalink) Old 01-21-2020, 04:50 PM
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Originally Posted by USN DMAX View Post
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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post #8 of 21 (permalink) Old 01-21-2020, 04:51 PM Thread Starter
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Quote:
Originally Posted by redwngr View Post
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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post #9 of 21 (permalink) Old 01-21-2020, 04:54 PM Thread Starter
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Got my sig filled out. Donít know why it doesnít show up. But truck is 17 Duramax

17 Silverado 3500 hd dually
13 corvette gs
13 Chevy voltóókilled
06 Pontiac solstice
07 Prius
06 Chevy 2500
95 Chevy 3500 Silverado ext cab dually
13 smart forto passion
19 Cadillac xts
17 volt
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post #10 of 21 (permalink) Old 01-21-2020, 04:58 PM
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Got my sig filled out. Don’t know why it doesn’t show up. But truck is 17 Duramax
Sig is visible on this post....

Quite a collection if they are all in the yard!

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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