OBD-II code · Chassis

C066D Service/Park Brake Chamber Pressure Sensor

Generic fault on service/park brake chamber pressure sensor — used on air-brake systems with combined service and spring-applied parking brake chamber.

Is it safe to drive with C066D?

The car may go into limp mode (reduced power). Get it diagnosed before a long trip.

Common causes

  • Most likelyPressure sensor failed

Symptoms

  • ABS warning light on
  • ESC/stability control deactivated
  • Possible reduced brake assist
  • Speedometer may behave erratically

Repair at a glance

Difficulty
Medium
DIY friendly
Best left to a mechanic
Typical labour
1–4 h
Emissions test
Usually unaffected
After the fix
A drive cycle is needed before the light stays off
Parts involved
Service Park Brake Chamber Pressure Sensor

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.