P1574 GMC - Stop Lamp Switch Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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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

When is the code detected?

The Powertrain Control Module (PCM) does not detect a stop lamp switch transition

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1574 Gmc 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.
OBDII Code P1574 Gmc - Stop Lamp Switch Circuit - AutoCodes.com

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P1574 GMC Comments

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