C0065high severityChassis
ABS Accumulator Pressure Low
on 2013 Audi A8 3.0L Supercharged V6 · AWD
What this code means
The ABS brake pressure accumulator has insufficient pressure to support ABS or traction control operations.
Symptoms
- ABS light on
- Brake pedal very firm
- Long pedal travel
- Traction control disabled
- Warning chime
Common causes
- Leaking accumulator
- Faulty ABS pump not building pressure
- Accumulator nitrogen charge depleted
- Internal hydraulic leak in modulator
Diagnostic steps
- Check accumulator pressure with scan tool
- Monitor pump run time and pressure build
- Inspect for external brake fluid leaks
- Test pump motor operation
- Check for hydraulic unit internal leaks
Repair notes
Replace accumulator or ABS hydraulic unit. Bleed system thoroughly.
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