C0618 code meaning
Park Brake Control Module Control Circuit High
What C0618 means
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.
C0618 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0618
- 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
Common causes of C0618
- Most likelyFaulty voltage regulator in the alternator or DC/DC converter
- PossibleOvervoltage from a jump starter or charger on a 24 V setting
- Less likelyEnable or control line shorted to a battery-fed wire
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Epb control moduleABS control module
What each part of C0618 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 18 | The exact fault in that area. |
What to do next
- Note C0618 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0618
What does C0618 mean?
C0618 means "Park Brake Control Module Control Circuit High". C0618 is the overvoltage counterpart of C0617: the feed or control line of the parking brake electronics reads above its window. It is a generic code, so it means the same on every make.
Is it safe to drive with C0618?
Drive gently and only to a workshop. With C0618 the car can go into limp mode (reduced power) to protect itself.
Will C0618 fail an emissions test?
C0618 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0618 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will C0618 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.