Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
To diagnose the P1574 GMC code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The Powertrain Control Module (PCM) does not detect a stop lamp switch transition
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.
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