A damaged, corroded, or disconnected connector at the right rear park brake actuator.; A chafed or broken wire in the right actuator control circuit, often near the caliper or through a body grommet.; High resistance or an open in the actuator motor winding itself, causing low current draw.; A failing park brake control module or electronic brake control module output driver.; Corrosion or water intrusion into the actuator housing or its pigtail connector.; A poor ground connection shared by the parking brake system on the right side.; A short to ground on the control circuit that pulls the commanded voltage low.

DTC codes / C06xx · Brakes, steering and suspension / C0611

C0611Right Park Brake Actuator Control Circuit Low

Q: What does code C0611 mean?

Right Park Brake Actuator Control Circuit Low. C0611 means the electronic control module that manages the right-side electric parking brake has detected a low-voltage condition on the control circuit for the right park brake actuator. The computer commanded the actuator to apply or release, but the voltage on that circuit stayed below the expected threshold, so it flagged the circuit as low.

C0611 means the electronic control module that manages the right-side electric parking brake has detected a low-voltage condition on the control circuit for the right park brake actuator. The computer commanded the actuator to apply or release, but the voltage on that circuit stayed below the expected threshold, so it flagged the circuit as low.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

The red brake warning light or a yellow parking brake service light stays on after startup.
The right rear parking brake may fail to apply or release, leaving that wheel dragging or free.
A message such as 'Parking Brake Fault' or 'Service Parking Brake' appears on the dash.
The parking brake may apply automatically but not release, or release but not apply on the right side.
Often no symptoms besides the warning light, because the fault can be intermittent.
The electronic parking brake switch may feel unresponsive or require repeated presses.

Common causes, most likely first

A damaged, corroded, or disconnected connector at the right rear park brake actuator.
A chafed or broken wire in the right actuator control circuit, often near the caliper or through a body grommet.
High resistance or an open in the actuator motor winding itself, causing low current draw.
A failing park brake control module or electronic brake control module output driver.
Corrosion or water intrusion into the actuator housing or its pigtail connector.
A poor ground connection shared by the parking brake system on the right side.
A short to ground on the control circuit that pulls the commanded voltage low.

How to diagnose and fix it

Scan all modules and record freeze-frame data for C0611 before clearing anything.
Inspect the right rear park brake actuator connector and pigtail for corrosion, water, or loose pins.
Measure resistance and voltage on the control circuit at the actuator while commanding apply and release with a scan tool.
Check the circuit for a short to ground and for excessive resistance with a wiring diagram and multimeter.
Test the actuator motor directly with a known-good power and ground to confirm it moves freely.
If the actuator tests good, back-probe the control module output and compare commanded versus actual voltage.
Repair the wiring or connector, replace the actuator or module as diagnosed, then clear codes and verify with a full apply and release cycle.

What a low circuit code really means

A low circuit code does not automatically mean the actuator is bad; a corroded connector or chafed wire often causes the voltage drop.
The park brake actuator shares its harness routing with the rear wheel speed sensor on many vehicles, so inspect both circuits together.
An intermittent C0611 that only appears in cold or wet weather usually points to a connector or wire, not the motor.
Some vehicles set this code when the battery voltage is low during a park brake apply, so check the charging system first.
Replacing the actuator without checking the control module output can leave the same code stored if the driver circuit is faulty.

Can I keep driving with C0611?

You can usually drive with C0611, but the right rear parking brake may not hold or may drag, so avoid parking on steep hills and confirm the brake releases fully before driving. If the wheel drags or the brake warning light flashes, stop and have it inspected.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.