Hello, having some issues on my 2004 C70, and hope you can help.

Last night when I parked my car, I noticed tail lights were still on after the car was off and key out of ignition. Got in, started up, and it immediately went into winter mode and wouldn't exit. Turned off and on a few times, shifting through each position. Eventually it went out of winter mode, but now check engine light is on. Ran code reader with Torque but didn't get a faults. I check online to see if there was something else I can do and see mention of pulling up the DTC menu by holding the read button on the turn indicator while ignition set to II, and toggling the fog lights. No dice. See others complaining about that method not working for their C70s either.

Anyone got a clue? I can't afford to take it in to the dealer, plus I don't have one close by.