C0151moderate severityChassis
Regen Braking Blend Control Malfunction
on 2004 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
The system that blends regenerative and friction braking is not operating correctly.
Symptoms
- Braking feel inconsistent
- Pedal effort changes
- Jerky deceleration
- Reduced regenerative braking recovery
Common causes
- Brake pedal simulator malfunction
- Hydraulic control unit fault
- Communication latency between modules
- Software calibration error
Diagnostic steps
- Monitor regen vs friction brake split with scan tool
- Check brake pedal simulator operation
- Verify module communication timing
- Test hydraulic actuator response
- Check for software updates
Repair notes
Diagnose blend control actuators. Software update may be available.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic