P0571 GMC – Cruise Control/Brake Switch ‘A’ Circuit Malfunction

P0571 GMC Possible Symptoms

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

P0571 GMC Possible Causes

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

P0571 GMC 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.