C0065
ABS Accumulator Pressure Low
1997-2000 BMW 528i E39 2.8L I6 🇦🇺
High SeverityChassis
Description
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.
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
C0065 on Other Vehicles
Common Questions
What does code C0065 mean on a 1997-2000 BMW 528i E39?
C0065 stands for "ABS Accumulator Pressure Low". The ABS brake pressure accumulator has insufficient pressure to support ABS or traction control operations.
What are the symptoms of C0065 on a BMW 528i E39?
Common symptoms of C0065 include: ABS light on, Brake pedal very firm, Long pedal travel, Traction control disabled, Warning chime.
What causes C0065 on a 1997-2000 BMW 528i E39?
Common causes of C0065 include: Leaking accumulator, Faulty ABS pump not building pressure, Accumulator nitrogen charge depleted, Internal hydraulic leak in modulator.