Chassis, generic

C0680 Electric Park Brake Module Internal Fault

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Public evidence for C0680 is lacking: it is in none of the public J2012 tables, bulletins or maker indexes. The title describes a park brake controller that fails its own checks. How GM handles that is documented for the 2011 Saab 9-5, just under other numbers: C056E flags software that is missing, an absent calibration or implausible software, and C0558 a calibration or mechanical fault; depending on the case the brake is disabled outright or allowed one more release. In many current cars the park brake logic lives inside the ABS/ESC module, which drives both motors directly. After pad or caliper work the system must be put into maintenance mode and calibrated again, so a skipped calibration or interrupted programming is a likely trigger alongside a genuinely failed board.

Likely causes

Calibration after brake service skipped or programming interrupted
Electronics inside the park brake or ABS/ESC module failed
Low battery voltage during self-test or programming

Symptoms

  • Park brake warning, function disabled or degraded
  • Brake cannot be applied, or only one more release is allowed

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,200
Time0.5–3 h

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

Parts involved

epb control module

Related codes

C0615C0616U0128C0671

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