Chassis, generic

C0671 Electric Park Brake Actuator Right Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

C0671 cannot be traced publicly: no publicly available J2012 list, no NHTSA bulletin, no GM keyword list and no Saab index contains it. GM even uses the neighbouring C0670 for a damping sensor and logs the electric park brake motor of the 2011 Saab 9-5 under C028A, with subcodes for shorts to plus or to ground, an open circuit and wrong frequency. The title points to the right rear caliper actuator. In the TRW design a motor turns a gearbox via a toothed belt, which drives a spindle and nut against the piston; swash-plate units reach about 19 kN, planetary ones about 25 kN. To release, the module reverses the motor polarity. Corrosion at the plug or a dead motor leaves that wheel unclamped or stuck, and ZF warns against freeing it with an external power source.

Likely causes

Moisture or corrosion at the actuator plug in the wheel housing
Actuator motor or gearbox defective
Chafed or broken wire between module and actuator

Symptoms

  • Park brake warning light or message
  • Right rear brake does not apply or does not release

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–700
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

epb actuator rightepb control moduleactuator wiring

Related codes

C0610C0611C0612C0613C0680

References: aftermarket.zf.com, vehicleservicepros.com, aftermarket.zf.com, saabwisonline.com.