Code Definition

P1935 — Brake Switch/Sensor Signal

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Mazda

About P1935

P1935 is a manufacturer-specific powertrain diagnostic trouble code recorded for Mazda vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1935 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1935 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Powertrain Control Module (PCM) monitors the brake switch and brake pedal position sensor signal to determine when the driver applies the brake pedal. DTC P1935 is set when the PCM detects an implausible, missing, or inconsistent brake signal compared against correlated inputs such as vehicle speed, throttle position, and stop lamp circuit state. The brake signal is used for functions including cruise control cancellation, brake shift interlock, idle stop system control, and on hybrid variants regenerative braking, so an unreliable signal affects multiple subsystems. With this code set the...

Join TaT to view the complete code information and diagnostic details.

Quick Facts