Code C0297 on the 2020 Mazda CX-5 indicates a fault in the brake pedal position sensor circuit. This sensor provides critical input to the ABS, stability control, and brake assist systems, allowing them to detect brake pedal application speed and pressure for optimized braking response.
Brake Pedal Sensor Technology
The brake pedal position sensor is typically a dual-output potentiometer or Hall-effect sensor mounted at the brake pedal assembly. It measures how far and how fast the pedal travels when pressed. Mazda's i-ACTIV AWD system and Smart City Brake Support use this data to modulate braking force and activate emergency brake assist when rapid pedal depression is detected.
What You'll Notice
With C0297 stored, the ABS and Dynamic Stability Control (DSC) warning lights will illuminate. The brake assist function may be disabled, meaning aggressive brake applications may not receive the additional stopping force normally provided. The CX-5 remains safe to drive with normal braking, but emergency braking enhancement is compromised.
Diagnostic Path
This code typically results from sensor failure, wiring issues, or connector problems at the brake pedal switch. The sensor is located at the top of the brake pedal arm, behind the dashboard. Accessing it requires removing lower dash panels. Test the sensor output voltage at various pedal positions to verify proper operation.
Repair Process
Sensor replacement involves removing the dash panel under the steering column for access. The sensor typically mounts with screws or clips and has a multi-pin connector. After installation, some Mazda models require a pedal position relearn procedure using a scan tool to calibrate the new sensor to the DSC module.