- 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
When is the code detected?The Powertrain Control Module (PCM) does not detect a stop lamp switch transition
- Engine Light ON (or Service Engine Soon Warning Light)
P1574 Gmc DescriptionThis 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.
Need more help?Get the P1574 Gmc code diagnosed by a professional: Find a repair shop in your area
P1574 GMC CommentsHelp us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P1574 Gmc code? Have you replaced any parts?
Any information is appreciated. Thanks