C0150high severityChassis
Regenerative Braking System Malfunction
on 2000 Audi A6 2.8L V6 · AWD
What this code means
General fault in the regenerative braking system that recovers energy during deceleration.
Symptoms
- Regenerative braking warning light
- Reduced fuel economy
- Braking feel changes
- Battery not charging during braking
Common causes
- Hybrid battery state-of-charge issue
- Inverter malfunction
- Motor-generator fault
- Communication error between brake and hybrid modules
Diagnostic steps
- Check hybrid battery SOC and health
- Scan hybrid powertrain module for related codes
- Test motor-generator output during braking
- Verify CAN communication between brake and hybrid modules
- Check for high-voltage isolation faults
Repair notes
Diagnose hybrid powertrain system. Regenerative braking requires a healthy battery and motor-generator system.
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