C0066
ABS Pressure Circuit Malfunction
1995-1999 BMW 318ti E36 1.9L I4 🇨🇦
High SeverityChassis
Description
General fault in the ABS hydraulic pressure sensing or regulation circuit.
Symptoms
- ABS light on
- Stability control disabled
- Brake pedal feel abnormal
- ABS may activate unexpectedly
Common Causes
- Faulty ABS pressure sensor
- Hydraulic unit internal leak
- Pressure transducer failure
- Wiring to pressure sensor damaged
Diagnostic Steps
- Read ABS pressure sensor values with scan tool
- Compare commanded versus actual pressure
- Inspect pressure sensor wiring
- Check for brake fluid leaks at ABS unit
- Test pressure transducer
Repair Notes
Replace ABS pressure sensor or hydraulic unit as needed.
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
C0066 on Other Vehicles
Common Questions
What does code C0066 mean on a 1995-1999 BMW 318ti E36?
C0066 stands for "ABS Pressure Circuit Malfunction". General fault in the ABS hydraulic pressure sensing or regulation circuit.
What are the symptoms of C0066 on a BMW 318ti E36?
Common symptoms of C0066 include: ABS light on, Stability control disabled, Brake pedal feel abnormal, ABS may activate unexpectedly.
What causes C0066 on a 1995-1999 BMW 318ti E36?
Common causes of C0066 include: Faulty ABS pressure sensor, Hydraulic unit internal leak, Pressure transducer failure, Wiring to pressure sensor damaged.