P1574 CADILLAC – Stop Lamp Switch Circuit

P1574 CADILLAC Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1574 CADILLAC Possible Causes

Stop Lamp Switch out of adjustment,Faulty Stop Lamp Switch,Stop Lamp Switch harness is open or shorted,Stop Lamp Switch circuit poor electrical connection

P1574 CADILLAC Description

This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the Powertrain Control Module (PCM) detects that there is a 4.2 km/h (2.6 mph) or greater decrease in vehicle speed within 0.25 seconds and a transition of the Torque Converter Clutch (TCC) brake/cruise release switch without a transition of the stop lamp switch, the PCM sets DTC P1574.