[Selj]

I have a 2015 3/4 ton Silverado. When the fuel level drops below around 3/4 tank my check engine light come on. When I fill the tank and drive a little bit, like home from the gas station, the next time I start my truck the light is off. It stays off until I get below 3/4 tank again. It isn't exactly 3/4 of a tank, sometimes it comes be around a half a tank. I changed the air filter, which was pretty dirty and I thought that fixed it. But no, the light just came on a little later. I'm sure it's some type of emissions problem (it seems like the check engine is usually an emissions problem). But what??

 

[2019LTZ2500]

When the check engine light is on connect a OBD2 Scanner and find out what code is being generated and post it up here. That will help us to determine what the problem could be.

 

[BOWTIE67]

If you are throwing parts at it. It sounds like a gasser. Buy a new gas cap. possibly the seal is gone on the old one.

 

[Selj]

I have a 2015 3/4 ton Silverado. When the fuel level drops below around 3/4 tank my check engine light come on. When I fill the tank and drive a little bit, like home from the gas station, the next time I start my truck the light is off. It stays off until I get below 3/4 tank again. It isn't exactly 3/4 of a tank, sometimes it comes be around a half a tank. I changed the air filter, which was pretty dirty and I thought that fixed it. But no, the light just came on a little later. I'm sure it's some type of emissions problem (it seems like the check engine is usually an emissions problem). But what??

I hooked up the code reader and it shows P01F0 "Coolant temperature dropped below monitoring temperature".
Very confused why this would reset itself when I fill up the fuel tank.

 

[Selj]

If you are throwing parts at it. It sounds like a gasser. Buy a new gas cap. possibly the seal is gone on the old one.

No, it's a diesel. Hooked up the code reader. Code = P01F0 "Coolant temperature dropped below monitoring temperature".

 

[Selj]

When the check engine light is on connect a OBD2 Scanner and find out what code is being generated and post it up here. That will help us to determine what the problem could be.

I hooked up the code reader and it shows P01F0 "Coolant temperature dropped below monitoring temperature".
Very confused why this would reset itself when I fill up the fuel tank. Maybe it's a coincidence, but that seems unlikely since it's done it at least a half dozen times.

 

[Ron Nielson]

Next time you get the light, remove your fuel tank cap and see if the light clears without doing anything else. It COULD be the fuel cap, and that would be EASY and CHEAP to fix.

As for you code, see this: OB2 code P01F0