Low coolant / preform service messages

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Eaglefire21

Junior Member
Supporting Member
Joined
Mar 11, 2018
Posts
22
Reaction score
8
Location
Tx
Ram Year
2018
Engine
6.7
Have a Low coolant warning show up coolant level is fine. I changed senser in coolant jug warning still there. Anyone have wireing/plug issuse with crewcab duallys
 

KoboldTaco

Senior Member
Supporting Member
Joined
Mar 6, 2022
Posts
418
Reaction score
532
Location
Los Angeles
Ram Year
2022
Engine
Cummins 6.7L
Start by tracing the circuit that throws the code. Assuming you are at a proper fill level, a new sensor, Sounds like a visit with the wiring diagram, and perhaps a computer that can read live bus data, voltage etc. Not sure there will be a PID to review live but worth checking if you have access to a tool like that.

My CTD is touchy on the fill level.
 

18CrewDually

Senior Member
Joined
Nov 17, 2019
Posts
2,012
Reaction score
2,583
Location
U.S.- New Jersey
Ram Year
2018
Engine
Cummins 6.7 H.O.
The coolant tanks have a float in them that the sensor picks up when it is full. What happens is the float becomes waterlogged and no longer floats, giving the low coolant message.
The only fix at that point is complete reservoir change since the float is integrated to the tank.
This is what I've been finding and actually when the weather breaks will be swapping out my father's reservoir in his 2018 CTD Longhorn CC Dually.
 

chopperman1

Senior Member
Military
Joined
Dec 26, 2013
Posts
1,229
Reaction score
1,189
Location
Peoples Republic of Massachusetts
Ram Year
2018 Rebel
Engine
5.7L HEMI
Try jumping the sensor plug to rule out a wiring issue. If that tests fine, then test the sensor with a magnet & meter and see if it closes. If it does, then you need to replace the tank itself. There is a floating magnet in there that closes the sensor. Here's a great video. https://www.youtube.com/watch?v=gB0-2aMFcZ0
 
OP
OP
Eaglefire21

Eaglefire21

Junior Member
Supporting Member
Joined
Mar 11, 2018
Posts
22
Reaction score
8
Location
Tx
Ram Year
2018
Engine
6.7
Thank you, I will get testing done this weekend
 
OP
OP
Eaglefire21

Eaglefire21

Junior Member
Supporting Member
Joined
Mar 11, 2018
Posts
22
Reaction score
8
Location
Tx
Ram Year
2018
Engine
6.7
I like that video, inforative and straight to the point
 

Staff online

Members online

Forum statistics

Threads
194,902
Posts
2,863,860
Members
155,252
Latest member
radikio
Top