Low coolant

Sounds like level sensor, take it to shop

 

Another Volvo with electrical issues, say it ain't so!

 

Try sticking a paper clip in it

 

Mine did the same thing, took it to Volvo and they unplugged the coolant sensor and no more shutting off

 

There is a way to by pass it I was having the same thing on.my ,08 if you don't understand what I'm about to say shoot me a message

Un plug the sensor(bottom side of coolant tank on a d13)
Ur d12 is possibly the same..Take a piece of wire I used speaker wire Thats what I had. Put it from one side loop it to the other tape it up start the truck. Chances are the code will still be there but it Wont shut the truck off. It'll run fine.


Mine Broke down in Reno kept shutting off. So after I did that"last option" drove it to Sacramento no issues.

 

Good. Gotta love our old u.s express gold mines eh?

 

When you're driving down the road and your passenger window rolls downs on it's own, and it will, jam a paperclip in the switch to hold it in the up position. Their good riding trucks but they do have issues like in your case....a cheap sensor causing you grief and lost income.