What it means
Right EPB actuator control voltage above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The right park brake actuator control circuit carries the module's command to operate the right-side parking brake actuator. C0612 indicates that circuit voltage is above its expected range, which can result from a short to battery voltage or a supply wire contacting a power source.
Common causes
Most likely first.
- Wiring shorted to battery
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Use a brake-capable scan tool to capture freeze-frame data and determine whether the code appears during a right actuator command.
- Inspect the right actuator wiring for pinching, damaged insulation, contact with a power feed, water intrusion, or corroded or displaced connector pins.
- Check related park brake supply and ground connections and note any other electrical or brake-module codes.
- Using the vehicle-specific wiring diagram, measure the affected circuit and compare its readings with the manufacturer's specification.
- If voltage remains high when it should not, isolate the right actuator circuit and locate a short to battery or a pinched wire before replacing components.
Common fixes
- Secure a loose right actuator harness away from power feeds or sharp edges.
- Repair insulation damage where the right actuator circuit contacts a power source.
- Clean or repair damaged connector terminals at the right actuator or module.
- Replace a confirmed faulty actuator or module only after the circuit wiring tests correctly.
Can I keep driving?
The right parking brake actuator may not apply or release correctly, and ABS or stability functions may be limited. Avoid relying on the parking brake; if normal braking is affected or a brake warning appears, stop in a safe place and arrange repair before continuing.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.