Chassis, generic

C0612 Right Park Brake Actuator Control Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

With C0612 a lead of the right parking brake motor stays at or near battery voltage while the bridge tries to pull it low. Likely causes are a short to a live wire in the rear harness, a wrong splice after body or axle repair, or a defect in the output stage. Driver ICs such as the DRV8873-Q1 treat a short to the supply as its own protected fault and disable the output. GM's PIT5662A, written for park brake messages on the Acadia, XT5, Enclave and Traverse, has technicians measure both rear circuits at the brake module with the actuators plugged in; a reading above 6 ohms means wiring or actuator repair. No maker publishes C0612. The right brake keeps its last position, and a parking brake warning lights up.

Likely causes

Motor lead shorted to a battery-fed wire in the rear harness
Failed low-side switch in the control unit holding the lead high
Wrong pin or splice after an earlier harness or body repair

Symptoms

  • Service parking brake message and warning lamp
  • Right parking brake does not respond to the switch
  • Code may return as soon as an apply is commanded

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–900
Time0.5–2.5 h

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

Parts involved

right epb actuatorepb control module

Related codes

C0610C0611C0613C060D

References: ti.com, static.nhtsa.gov, static.nhtsa.gov.