C0618Park Brake Control Module Control Circuit High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyFaulty voltage regulator in the alternator or DC/DC converter
- PossibleOvervoltage from a jump starter or charger on a 24 V setting
- RareEnable or control line shorted to a battery-fed wire
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.