C1423 The master cylinder pressure sensor reads below its zero point
What does C1423 mean on a Toyota?
C1423. The master cylinder pressure sensor reads below its zero point. Brake assist is disabled and the ABS warning light comes on.. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.
Common causes of C1423
- Faulty brake actuator assembly (master cylinder pressure sensor)
- Open or shorted actuator harness
- Poor electrical connection at the actuator
How to fix C1423
- Confirm the code with a scan tool
- Inspect the sensor and its connector
- Test the sensor circuit for opens and shorts
- Check sensor power and ground
- Replace the sensor only after the circuit tests fail
- Clear the code and retest