C0617: Park Brake Control Module Control Circuit Low

What it means

Park brake control module supply voltage below 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 park brake control module supply circuit provides the voltage the module needs to operate its actuator drive. C0617 indicates that the module detects supply voltage below its expected range, which may result from a weak battery, high resistance at a connection, or damaged wiring.

Common causes

Most likely first.

1. Low battery or weak supply
2. Connector pins corroded - high contact resistance
3. Harness chafing through insulation

Symptoms

• ABS warning light on
• ESC/stability control deactivated
• Possible reduced brake assist
• Speedometer may behave erratically

How to diagnose it

1. Use a brake-capable scan tool to record freeze-frame data and check whether C0617 appeared during a park brake command or alongside low-voltage codes.
2. Check battery and charging-system condition before tracing the module circuit, since low vehicle voltage can trigger a supply fault.
3. Inspect the module supply and ground connectors for corrosion, loose terminals, pushed-back pins, or water intrusion.
4. With the vehicle wiring diagram, measure supply and ground at the park brake module and compare readings with the manufacturer's specification.
5. If the fault changes while moving the harness, isolate the damaged section and test for chafing, excessive resistance, or an intermittent connection.

Common fixes

• Charge or replace a weak battery if testing confirms it cannot maintain proper system voltage.
• Clean and secure corroded or loose park brake module supply and ground connections.
• Repair chafed or damaged wiring in the module supply circuit.
• Replace a faulty module only if its supply and ground meet specification under load.

Can I keep driving?

The park brake may not operate reliably, and ABS or stability functions may be limited. Avoid relying on the parking brake to hold the vehicle; if normal braking is affected or brake warnings appear, stop safely and arrange repair before continuing.