DTC P0504-27: Brake Switch A/B Correlation - Signal rate of change above threshold: Action
- Check for related brake pressure DTCs within the anti-lock braking control module
- Check brake pedal switch is fitted correctly. Clear DTC, start the engine and press the brake pedal, using maximum travel, for greater than 1 minute taking care not to press the accelerator pedal
- Check and install new brake pedal switch as required