Code
C0615
Generic
C — Chassis
Park Brake Control Module Control Circuit/Open
Views:
UK: 22
EN: 26
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between park brake switch/actuator and the control module
- Corroded, loose or damaged connector at the park brake control module or actuator
- Blown fuse or tripped relay supplying the parking brake circuit
- Failed park brake control module or actuator (motor/solenoid)
- Poor or missing ground return for the park brake module or actuator
- Water intrusion or corrosion in connectors or actuator
Symptoms
- Parking brake warning light or EPB lamp illuminated
- Parking brake will not apply or will not release when commanded
- EPB switch or lever has no effect, or intermittent operation
- Audible motor/actuator does not run when commanded
- Stored DTCs related to parking brake control or communication
- Vehicle may show creep or cannot be secured with electronic park brake engaged
What to check
- Scan tool: read and record DTC(s), freeze frame, and live data; attempt active command of EPB while monitoring
- Visual inspection of wiring and connectors at park brake control module and actuator for corrosion, damage, or separation
- Check fuses and relays for the parking brake circuit
- Verify battery voltage and proper vehicle ground connections
- Backprobe the module connector and actuator connector to check for presence of battery voltage and ground when commanded
- Perform wiggle test on harness while observing live data or status to reproduce fault
Signal parameters
- At rest: control/actuator circuit may show battery voltage on feed and ground on return; an open will show no continuity (OL)
- When commanded: voltage on control pin should switch to battery voltage (approx. 11–14 V) or module drive state; open circuit = no change
- Actuator/motor coil resistance (typical) — often low ohms; an open will read infinite resistance (exact value varies by vehicle/manufacturer)
- Module ground circuit should read near 0 Ω to chassis; voltage drop when energized should be small (
- CAN/LIN comms (if used) should show valid bus activity; loss of communication may accompany this fault
Diagnostic algorithm
- Use a scan tool to confirm C0615 and any related codes (note freeze frame and current status).
- With ignition on, attempt an EPB apply/release while watching live data and listening for actuator; note if actuator runs.
- Visually inspect harnesses, connectors and actuator for damage, corrosion, moisture, or loose pins. Disconnect and reseal/clean as needed.
- Check related fuses and relays; replace any blown fuses and retest.
- Backprobe the park brake control module connector and the actuator connector. Check for battery feed, ground, and control signal while commanding the EPB.
- Measure continuity between the module pin and actuator pin for the control circuit. An open indicates wiring fault — repair wiring or connector.
- Measure actuator motor/solenoid resistance; infinite resistance indicates internal open — replace actuator if confirmed.
- Repair any damaged wiring or connector terminals, secure grounds, and protect from moisture. Restore proper routing to avoid chafing.
- Clear codes and perform function tests and a road test or repeat operations to ensure fault does not return.
- If wiring and actuator check OK but fault persists, consider replacement/bench testing of park brake control module per manufacturer procedure.
Likely causes
- Disconnected or corroded connector at module or actuator
- Open wire (broken conductor) in harness between module and actuator
- Failed parking brake actuator (motor/solenoid) presenting open circuit
- Blown fuse supplying the parking brake circuit
- Poor ground at module
Fault status
Status
C0615 — Park Brake Control Module Control Circuit/Open: the control circuit for the electronic parking brake is open or not connected, preventing normal control of the parking brake actuator.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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