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C0617 — Park Brake Control Module Control Circuit Low

Generic OBD-II · all makesChassis

C0617 indicates that the Park Brake Control Module has detected a low voltage condition on its control circuit, meaning the circuit is reading below the expected reference. This is usually caused by an electrical fault such as a short to ground, an open circuit, or a failed component in the park‑brake system. When this code is active the park brake may not release or engage properly and a warning light will typically be illuminated.

Symptoms

What causes it — most likely first

1. Damaged wiring or connector (short/open)

A chafed, melted, or corroded wire or connector can create a low‑resistance path to ground, pulling the circuit voltage down. This is the most common source of C0617.

2. Faulty park‑brake switch or release motor

The switch that signals the module or the electric motor that releases the brake can fail internally, causing the control circuit to read low. Mechanical wear or water intrusion often leads to this.

3. Weak or corroded ground or power supply

A loose, corroded, or damaged ground strap at the park‑brake module can prevent proper voltage return, resulting in a low circuit reading. Similarly, insufficient power from a weak charging system can affect the module.

4. Blown fuse or relay for park‑brake circuit

If the fuse that protects the park‑brake control circuit is open, the module will see a low voltage condition and set C0617.

5. Park‑brake control module internal failure

The module’s internal driver circuitry can short, causing the circuit to stay low. This is less common but can occur after a voltage spike.

6. PCM/ECM misinterpretation (rare)

A software error in the powertrain control module may incorrectly flag the circuit, but this should be considered only after all other electrical faults are ruled out.

How it's diagnosed

  1. Retrieve all DTCs and note any related codes to understand the full electrical picture.
  2. Visually inspect the park‑brake wiring harness and connectors for damage, corrosion, or loose pins.
  3. Check and test the park‑brake circuit fuse and relay; replace if open.
  4. With the key on, measure voltage and ground at the park‑brake module’s power and signal circuits using a multimeter; compare to specifications.
  5. Test the park‑brake switch/motor for resistance and proper operation; verify it behaves per the manufacturer’s values.
  6. If wiring and component tests pass, substitute a known‑good park‑brake control module to confirm internal failure, otherwise investigate other modules.

Code facts & related codes

SystemChassis
StandardizationSAE generic — identical on every make
Related codesC0610 — Right Park Brake Actuator Control CircC0611 — Right Park Brake Actuator Control CircC0612 — Right Park Brake Actuator Control CircC0613 — Right Park Brake Actuator PerformancesC0614 — Right Park Brake Actuator StuckC0615 — Park Brake Control Module Control Circ

Frequently asked

Can a low battery or weak charging system cause C0617?

A severely discharged battery can cause low voltage to the module, but the code is set because the park‑brake control circuit itself is low. If the charging system is healthy, the fault is usually in the wiring or component, not merely the battery.

I've been told to replace the PCM for C0617 – is that necessary?

The PCM is rarely the cause of C0617. Most cases stem from wiring, connectors, fuses, or the park‑brake switch/motor. PCM replacement should be a last resort only after all other electrical faults have been ruled out.

Is it safe to drive with C0617?

If the park brake fails to release you may be stuck in park; if it fails to engage the vehicle could roll. It is advisable to have the issue diagnosed before driving to avoid safety risks.

Will clearing the code fix the problem permanently?

Clearing the code resets the indicator but does not repair the underlying fault. If the electrical problem is not fixed, the code will return as soon as the circuit is re‑energized.