Master Cylinder Pressure Sensor Circuit Low
2000-2000 Mazda B3000 3.0L V6
The 2000 Mazda B3000 is equipped with a 3.0L V6 engine. Below you'll find detailed c0086 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Low voltage from the master cylinder brake pressure sensor, indicating a circuit fault.
Symptoms
- ABS light on
- Stability control disabled
- Brake assist may not function
- Regenerative braking malfunction on hybrids
Common Causes
- Sensor short to ground
- Faulty pressure sensor
- Connector pin damage
- Low battery voltage to sensor
Diagnostic Steps
- Test sensor supply voltage
- Check signal wire for shorts to ground
- Inspect sensor connector
- Test sensor output while pressing brake pedal
- Check for related ABS module codes
Repair Notes
Replace master cylinder pressure sensor. Verify supply voltage.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0086 on Other Vehicles
Common Questions
What does code C0086 mean on a 2000-2000 Mazda B3000?
C0086 stands for "Master Cylinder Pressure Sensor Circuit Low". Low voltage from the master cylinder brake pressure sensor, indicating a circuit fault.
What are the symptoms of C0086 on a Mazda B3000?
Common symptoms of C0086 include: ABS light on, Stability control disabled, Brake assist may not function, Regenerative braking malfunction on hybrids.
What causes C0086 on a 2000-2000 Mazda B3000?
Common causes of C0086 include: Sensor short to ground, Faulty pressure sensor, Connector pin damage, Low battery voltage to sensor.
Last updated: March 2026