In that case, check the resistance on the ground splice.
The C1249 you're getting is
Quote:
Any of the following is detected:
The vehicle speed is 10 km/h (6 mph) or more, the accelerator pedal is depressed, and the stop light switch is on for 60 seconds or more.
When the stop light switch is off, the master cylinder pressure is increased.
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I wouldn't have been surprised to see a dubious LED bulb fail, but it's also possible with a filament bulb if there is resistance on the ground. With the parking lamps on some voltage will go the other way, through the brake lamp filament and back up towards the brake switch/VSC ECU. If you don't have one already, go get a cheap DVOM to check the resistance, and while you're at it, check the voltage on the brake circuit when you turn on the park lamps.
BTW, those vampire splices on your rear tail light are a terrible way to install something, they can cut filaments and even in the best of cases, only make partial contact with the wire. In applications where you've got an actual electrical load (like an incandescent bulb), you're just asking for something to fail. Have a look at the bulb also, I've seen bulbs failures where the a filament broke and contacted the other mid-way across it's span and got welded.