Wondering if anyone can help. Driving to work this morning, suddenly out of no where TRC light on dash starts flashing along with engine light

Engine still running ok and sounding ok but clearly not all is well as I pulled over as soon as i could and stopped turned it off and then a lovely trail of brownish water appeared from under the engine.

I couldn’t quite make out where it was coming from didn’t look like the radiator but was just coming from the undertray.

Just wondering if this has happened to anyone and they know or have any idea what it might be??

Any help would be massively appreciated.

Cheers

Oli