C0155moderate severityChassis
Regenerative Braking Torque Sensor Fault
on 2021 Mazda MX-5 Miata 2.0L I4 · RWD
What this code means
The torque sensor that monitors regenerative braking output is reporting invalid data.
Symptoms
- Regen braking warning
- Reduced energy recovery
- Braking force inconsistent
- Hybrid efficiency reduced
Common causes
- Faulty regen torque sensor
- Sensor wiring damaged
- Motor-generator feedback fault
- Sensor connector corroded
Diagnostic steps
- Read regen torque sensor data during braking
- Compare motor-generator actual torque to commanded
- Inspect sensor wiring
- Check sensor connector
- Test sensor through full range
Repair notes
Replace regen braking torque sensor. Recalibrate after replacement.
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