Possible causes

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

When is the code detected?

The P0571 codes is set when the stop light switch does not turn off even once the vehicle is driven.

Symptoms

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

P0571 ISUZU 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.