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DTC codes / C05xx · Brakes, steering and suspension / C0577

C0577Park Brake Force Sensor Circuit Malfunction

The C0577 code indicates that the park brake force sensor circuit has a malfunction, meaning the control module is not receiving a valid signal from the sensor that measures how much force the parking brake applies. The computer detects an abnormal voltage or resistance on the sensor circuit, which can be caused by a faulty sensor, wiring issues, or a problem within the control module itself.

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

Symptoms you may notice

  • The parking brake warning light remains illuminated on the dashboard.
  • The electronic parking brake may not engage or release properly, or may operate intermittently.
  • A message may appear on the driver information center indicating a parking brake fault.
  • The vehicle may fail to hold on an incline when the parking brake is applied.
  • Often no symptoms besides the warning light, especially if the sensor fails gradually.

Common causes, most likely first

  1. Faulty park brake force sensor.
  2. Damaged or corroded wiring or connectors in the sensor circuit.
  3. Open or short circuit in the sensor wiring harness.
  4. Failed electronic parking brake control module.
  5. Mechanical binding or misalignment in the parking brake mechanism affecting sensor readings.
  6. Water intrusion or contamination in the sensor connector.

How to diagnose and fix it

  1. Use a scan tool to read the C0577 code and check for any related codes in the parking brake system.
  2. Visually inspect the park brake force sensor, its wiring, and connectors for damage, corrosion, or loose connections.
  3. Measure the sensor's resistance and voltage output with a multimeter and compare to manufacturer specifications.
  4. Check the continuity and resistance of the sensor circuit wiring to rule out opens or shorts.
  5. If the sensor is faulty, replace it and clear the code to see if it returns.
  6. If the wiring is damaged, repair or replace the affected section of the harness.
  7. If the sensor and wiring are good, test the control module and replace it if necessary.

Sensor circuit checks before module replacement

  • A common oversight is replacing the park brake force sensor without first checking the connector for water intrusion, which can cause intermittent signals.
  • The code can be set by a simple blown fuse that powers the sensor circuit, so always check fuses before condemning the sensor.
  • On some vehicles, the park brake force sensor is integrated into the parking brake actuator, requiring replacement of the entire assembly rather than just the sensor.
  • A misadjusted parking brake mechanism can cause the sensor to read out of range, setting the code even though the sensor itself is fine.
  • The control module may set this code if the battery voltage is low during parking brake operation, so verify battery condition first.

Can I keep driving with C0577?

If the parking brake warning light is on and the parking brake does not hold the vehicle, avoid parking on inclines and use wheel chocks if necessary. Have the system inspected promptly to ensure the parking brake functions correctly.

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.

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