Elvisfan0108

So I just received my CPO 450e. 12,000 miles. Just had the CEL come on. Without the engine even being on. An out of state purchase. I guess I’m in no hurry to bring it in. Waiting to see what else goes wrong. I have a dealer close.

mikapen

All the check lights come on when you turn the key to position one, aka on but not start. It's a system check to ensure that all the warning lights are operative.
Only the ones that remain after starting should be of concern.

Are you talking about one that didn't go out?

Elvisfan0108

Don’t know if you’re being smart or what. I’m 76 years old. I’ve owned 38 cars. You can’t possibly think anyone posting on here is that naive. Don’t know if I should be insulted.

mikapen

Your post wasn't informative. "One" check engine light doesn't come on when you go to the number one position.
So if only one came on there's a real problem.

I don't know why you should be insulted if I'm asking troubleshooting questions. I'm trying to help. Okay don't answer and I won't try to help. 🫤

Elvisfan0108

I thought I was pretty clear. I may have been wrong. I received the car yesterday. I am now driving around with the CEL on. Even though I’m driving in electric mode.

wildta

I think it may have been confusing because you said "without the engine being on" so we didn't know you were driving on the battery vs ignition 1.

All is clear now besides your CEL. Hopefully it's a fluke and it disappears tomorrow otherwise most of us would recommend an OBD2 reader or a dealer visit. It sounds like it's still driveable at least. Keep us posted.

Elvisfan0108

I started the car at least 5 times. The light is still on. I even put it in Sport Mode to test the engine. It seemed fine. It’s just strange that in electric mode, the CEL is on. I apologize for my response earlier.

BlueYonder

Your local auto parts store should be able to check the light for free. Could be a simple as a loose gas cap.

wildta

If you're able to get it scanned, this link is helpful in reading the codes:

https://cartriple.com/mercedes-fault-codes-list/

stktyz33

People keep suggesting an OBD2 reader but unless you have a DOIP one for 2024+ GLEs, your codes will be generic at best. You may get lucky and it throws something specific enough that won't require module specific OEM codes . In many cases, it means - call your dealer. If your dealer is willing, it can pull the info remotely when you setup them as your service retailer in Mercedes Me app.

Elvisfan0108

Checked the gas cap.