Possible causes

– Faulty Brake Switch
– Brake Switch harness is open or shorted
– Brake Switch circuit poor electrical connection

When is the code detected?

The P0573 codes is set when the stop light switch signal is too high.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Stop light inoperative
– Cruise control system inoperative

P0573 TOYOTA Description

When the brake pedal is depressed, the stop light switch sends a signal to the Engine Control Module (ECM). When the ECM receives this signal, it cancels the cruise control.