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DTC codes / C06xx · Brakes, steering and suspension / C0616

C0616Park Brake Control Module Control Circuit Performance

The C0616 code indicates that the park brake control module has detected a performance fault in its control circuit, meaning the electrical path that commands the parking brake to engage or release is not responding as expected. The module monitors voltage and current on the control circuit and sets this code when the signal does not match the commanded state within the expected time or range.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • The parking brake warning light stays illuminated or flashes on the dashboard.
  • The electronic parking brake may fail to engage or release when the switch is operated.
  • A message such as 'Park Brake Fault' or 'Service Parking Brake' appears in the driver information center.
  • The parking brake may engage automatically but not release, or vice versa, leaving the vehicle immobilized or without brake hold.
  • Often no symptoms besides the warning light, with the park brake appearing to function normally during casual use.

Common causes, most likely first

  1. A faulty or binding park brake switch, which fails to send a clean command signal to the control module.
  2. Damaged, corroded, or chafed wiring in the park brake control circuit, especially at connectors or where the harness flexes.
  3. A failing park brake control module, often due to internal circuit faults or water intrusion.
  4. A weak or failing electric park brake actuator motor that draws abnormal current, causing the module to log a performance fault.
  5. Poor ground connection for the park brake control module or actuator, leading to voltage drops under load.
  6. A blown fuse or relay in the park brake control circuit that intermittently opens under vibration or heat.

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, and record freeze-frame data to understand the conditions when C0616 set.
  2. Inspect the park brake switch and its connector for corrosion, loose pins, or mechanical binding, and test switch continuity through its range of motion.
  3. Check the park brake control circuit wiring for chafing, pinched sections, or corrosion at intermediate connectors, and perform a voltage drop test under load.
  4. Verify the park brake control module ground and power feeds, cleaning and tightening grounds as needed.
  5. Command the park brake actuator with a scan tool and observe current draw and travel time to identify a binding or weak actuator motor.
  6. If the actuator and wiring test good, substitute a known-good park brake control module and retest the system before condemning the original module.
  7. Clear codes and perform a park brake calibration or relearn procedure as required by the manufacturer, then road-test to confirm the repair.

What the park brake module is really watching

  • The control circuit performance fault often sets because the module sees the actuator motor current ramp up too slowly or too quickly, which points to a mechanical bind or a weak motor rather than a wiring break.
  • A park brake switch that feels fine to the driver can still produce a dirty signal; the module may log C0616 without any noticeable change in brake operation.
  • Water intrusion into the park brake control module connector or actuator housing is a common hidden cause, especially on vehicles where the module is mounted low under the body.
  • Technicians sometimes replace the control module first only to find the real fault is a corroded ground or a binding actuator, so always verify circuit integrity and actuator current draw before condemning the module.
  • C0616 can be set by a low battery or charging system issue that causes a voltage dip during park brake operation, so check battery health and charging voltage as part of the diagnosis.

Can I keep driving with C0616?

If the parking brake still engages and releases reliably, you can drive cautiously to a repair shop, but avoid parking on steep inclines where the brake might fail to hold. If the brake is stuck on or will not engage at all, do not drive the vehicle until the fault is repaired.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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