Chassis, generic

C0618 Park Brake Control Module Control Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0618 is the overvoltage counterpart of C0617: the feed or control line of the parking brake electronics reads above its window. A regulator fault in the alternator or DC/DC converter, jump starting with a booster set to 24 V, or a short between the enable line and a live wire are the usual reasons. Mitsubishi's ABS unit sets C10B7-17 once the ignition feed reaches 16 V or more, with a detection delay of up to one second, and the parking brake is then locked out. In GM's 2025 EBCM tables a motor voltage above 18 V for 700 ms halts the motor and blocks further actuation, logged as C0616. No maker publishes C0618. Check charging voltage with the engine running before blaming the brake module.

Likely causes

Faulty voltage regulator in the alternator or DC/DC converter
Overvoltage from a jump starter or charger on a 24 V setting
Enable or control line shorted to a battery-fed wire

Symptoms

  • Parking brake warning lamp, possibly with a battery or charging warning
  • Parking brake does not respond to the switch
  • Other modules may log overvoltage codes at the same time

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–600
Time0.3–2 h

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

Parts involved

epb control moduleabs control module

Related codes

C0615C0616C0617C0565

References: mitsubishitechinfo.com, gsi.ext.gm.com, komunikacie.uniza.sk.