OBD-II code · Chassis
C066F Service/Park Brake Chamber Pressure Too Low
Pressure in the service/park brake chamber dropped below required minimum — risk of insufficient braking force.
Is it safe to drive with C066F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAir leak in brake system
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Service Park Brake Chamber, Air Compressor, Air Lines
Related codes
- C066CRight Rear Wheel Speed Sensor B Incorrect Component Installed
- C066DService/Park Brake Chamber Pressure Sensor
- C066EService/Park Brake Chamber Pressure Too High
- C0670Electric Park Brake Actuator Left Circuit
- C0671Electric Park Brake Actuator Right Circuit
- C0680Electric Park Brake Module Internal Fault
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.