If you mean the "BRAKE LIGHTS", it could be the switch, the turn signal switch, broken wires or bad connection in the wires or a faulty ground. If you mean the tail lights that come on with the headlights, it could be a bad headlight switch, burned out bulbs, bad wires or connection or a faulty ground.
Then go to a professional and have them look at it. Or your headlights and taillights light bulb thing is blown out. Either way you should go to a professional or have them come to you and DON'T DRIVE YOUR CAR!:0)
Do parking and dash lights work? If not, may be fuse most vehicles it is the same circuit
Check your fuses. One is probably blown out. If that is the case you might check the trailer light hookup if you have one.
blown head gasket!
no
Possible ground issue at the taillights.
Bad servo Blown fuse Stop lights staying on Bad or misadjusted vacuum dump switch
Flasher relay is bad if the lights come on but do not flash. If they lights do not come on at all then the bulbs may be blown or the fuse if blown.
Why has my immobizer come on in my Mazda 6 and how can I turn it off
Check fuse Could be a bad switch
check your fuses first, if none are blown, check the bulbs if none are blown, then take it to a shop you've got a wiring issue.
White smoke is a symptom of a blown head gasket.