I have had to add coolant twice to my 17 so far, and about a month ago the truck was parked on a steep hill and the warning came on. Moved the truck and it went off. I only added about a quart each time, told dealer and as I figured they said its normal. Hasn't been normal for my 04 that ive never added in 14 years! [except for changing of course]

 

I have checked the coolant and it appears to be OK

It's at the Full Cold Mark? Or it looks just OK? You do know how to check it?
^^^^^^^^^^^^^^^^
If it's at this level then you need a new Engine Coolant Recovery TANK because your coolant level sensor comes with it.

TANK, Engine Coolant Recovery, TANK,RADIATOR SURGE(INCLUDES LEVEL SENSOR)

 

I also have gotten that light a few times on early morning cold start up , i have check the
coolant tank it shows full so im just letting it ride for now as the truck does not have 6000
miles on it yet.2017 2500

 

My 07.5 has done this since new, usually after I hit a speed bump too hard. I think the sensor is momentarily uncovered, and triggers the code.

 

Mine has also come on a couple of times, although I did add just a bit and the light hasn't been on since. Remember the cap is reverse thread.

 

I just had this today at about 3200 miles. Dealer said there’s a TSB about them being underfilled from the factory and topped it off.

 

I had the low coolant light come on as well, 8,000 miles on my L5P. It was -15 degrees outside on startup and it looked a little low, so I added some, and overfilled about 1/4inch above fill arrows on tank. My OCD has kicked in, does that little bit extra gonna hurt or not being over the fill mark?

 

Rest easy, if it has too much in it, the 'worst' that can happen is that it might push some out the overflow.

 

Okay thanks a lot! Appreciate the reply!����

 

Same here, started at 2,000 km. My old truck was the same (2008) and the tank was full.

Suck to have these kind of message on a brand new vehicle !

 

Mine has come on a couple times too. I wonder why these trucks would leave the factory with the coolant not topped off :think:

 

Some of them were/are leakers, so we are likely hearing it more than usual.

 

I have a 2018 3500 Duramax and have only owned it for 3 months. This is my first diesel truck. The "Coolant Level is low" warning came on this morning. Is this typical for a brand new truck? I have never had this happen with a vehicle that is that new. I don't know if diesels burn up the coolant or if there is a problem with my truck. I just had it serviced on Tuesday and the dealer didn't say if the level was low either. Shouldn't they be checking that on an oil change and "multipoint inspection"?

 

Same issue, 4700 miles 2018. Dealer says the issue is an air pocket that takes some time to purge. Remove cap on recovery tank when cold. Top off to full cold mark and should be fine. Also said it may look correct from the outside of tank but top off regardless.

 

Mine went to the dealer and they add a bit of coolant. The level seemed fine.


This was happening on cold start only. Will see if it hapening again....it not very cold right now but winter is not over yet... here.

 

Coolant was only down about 2 inches but evidently the sensor is above that mark. Once I added coolant it went out and never came back.

 

Check the other thread in this section:

http://www.dieselplace.com/forum/63...s/786-duramax-sixth-generation-2017-l5p/955170-two-trucks-row-coolant-loss.html

 

I have been fighting this issue for 2 years now. I get the notice low coolant but the bottle is fine.
Last 2 days at the dealer, and they replaced the bottle assy. As the sensor is all one part, thinking that the sensor was bad, so replaced the bottle assy., and sent me on my way. See how it goes now for a month or two.
If not MGMR. is seeing if GM will buy it back.

 

I have been getting a low coolant light many times a day during the last 3 weeks. Coolant is full. Sometimes the low coolant message will come on every thirty minutes, sometimes it won't do it for a day or two. Time to bring it in.

 

I see this is only for 2017 model year.

#PIP5487: 2017 6.6L L5P Duramax Coolant Leaks - (Mar 16, 2017)
Subject: 2017 6.6L L5P Duramax Coolant
Brand:
Model:
Model Year:
VIN:
Engine:
Transmission:

from
to
from
to

Chevrolet
Silverado
2017
All
All
6.6 L5P
All

GMC
Sierra
2017
All
All
6.6 L5P
All

Involved Region or Country
North America

Additional RPO/s:
6.6 L5P

Condition
A customer may comment on a coolant leak, coolant consumption or of a low coolant message being displayed on the Driver's Information Center (DIC).

Cause
This may be due to cooling system leaks or an improper coolant fill procedure.

It may take a few engine temperature cycles (from operating temperature to cold) for the coolant level to show a lower than normal level.

Be sure to complete the current SI coolant system leak checks and verify there are no external leaks.

Reference the locations below to aid in locating external coolant leaks.

If no external leaks are found, refill the cooling system following SI procedures for filling the cooling system.

Evaluate coolant levels after a proper coolant fill is completed.

Correction
If the diagnosis has lead to external coolant leaks or a coolant loss concern check for leaks in the following areas:

Object ID: 4747691Click here for detailed picture of the image.

Object ID: 4750018Click here for detailed picture of the image.

Welded flange leaking on the Exhaust Gas Recirculation (EGR) coolant return pipe. Refer to call out #1 in the above picture.

Object ID: 4747685Click here for detailed picture of the image.

Welded flange leaking on the Exhaust Gas Recirculation (EGR) coolant feed pipe. Refer to call out #2 in the above picture.

Object ID: 4747686Click here for detailed picture of the image.

Another view of the leaking welded flange on the Exhaust Gas Recirculation (EGR) coolant feed pipe. Refer to call out #2 in the above picture.

Object ID: 4749115Click here for detailed picture of the image.

Coolant leak at the O-ring seal of the Exhaust Gas Recirculation (EGR) coolant feed pipe. Refer to call out #2 in the above picture.

Object ID: 4749101Click here for detailed picture of the image.

View of a rolled or pinched O-ring at Exhaust Gas Recirculation (EGR) coolant feed pipe. Refer to call out #2 in the above picture.

Note: The leak shown above could only be confirmed after removing the front accessory drive bracket and alternator.

Object ID: 4750082Click here for detailed picture of the image.

Coolant leaking from coolant hoses at the Emission Reduction Fluid Injector (DEF Injector).

Please be aware of the following if there is a need to pressure test the cooling system:

Note: The radiator surge tank uses two different radiator surge tank caps. The radiator surge tank cap that vents pressure in the event of excessive cooling system pressure is located on the lower outboard side of the radiator surge tank (2). The radiator surge tank cap that is located on top of the radiator surge tank (1) is where the cooling system is filled and where pressure testing equipment is to be mounted.

Caution: The cap mounted to the top of the surge tank uses LEFT HAND threads. Turn the cap clockwise to remove the cap or counter clockwise to install the cap. Failure to turn the cap in the proper direction when installing or removing it may cause damage to the cap and/or the surge tank.

Refer to Cooling System Leak Testing (L5P) for more information.

 Version
1
Modified

 

My 2018 Duramax did the same thing. Took it to the dealer and was told that GM has some bad sensors on some trucks and they are currently working on a fix. The low coolant light was caused by a faulty sensor, the coolant wasn't actually low, according to the dealer.

 

The level sensor can’t be replaced by its own because the Recovery Tank (INCLUDES LEVEL SENSOR)

 

My 13 and 17 do this. Cold and inclined driveway here.

 

My 2017 Denali with 23k miles had the coolant light come on (second time in about 5-8k miles), dropped it off at dealer yesterday. Last time I took it in they said they had to purge the system. This time seemed weird as I haven't seen any coolant leaking and it wasn't that long ago since it was just in.

Got a call that they think it's a blown head gasket. Waiting to hear back now on next procedure.

 

My coolant tank was replaced several weeks ago, all is good with that now.