I would like to ask a question of others that are having this problem... Has anyone of you changed out you brake light bulbs say to LED's? Any mod to you brake light wiring or tail lights?
Causes for this P0573 cruise control code may include:
Cruise control/Brake switch defective
Wiring issue (e.g. pinched on brake pedal, chafed, etc.)
ECM (engine control module) issue (i.e. internal short, open, etc.)
Debris/dirt mechanically hindering brake switch operation
Brake switch not adjusted properly
Brake switch out of it's mount
Symptoms of a P0573 diagnostic code may include:
Cruise control completely inoperative
Erratic cruise control operation
Certain functions not operating as they should (e.g. set,resume, accel., etc.)
Cruise control turning on but not engaging
No brake lights if the brake light switch is faulty