Code P0567: Definition and Context
P0567 is a generic OBD-II code related to the cruise control’s “Resume” signal circuit. It indicates that the ECM (Engine Control Module) has detected an electrical anomaly in this circuit. This code primarily affects cruise control functions, especially speed resumption after braking or overtaking.
Severity
- Moderate level: The vehicle remains usable, but cruise control may be disabled.
- Secondary risk: Ignoring the issue could, rarely, worsen electrical faults (e.g., short circuits, ECM damage).
Common Symptoms
- Cruise control inoperative or operating erratically.
- Cruise control indicator light off or flashing on the dashboard.
- “Resume,” “+,” “–” buttons unresponsive.
Possible Causes
- Mechanical/electrical failures:
- Faulty cruise control switch (sticky buttons, oxidized contacts).
- Damaged wires (exposed cables, short circuits).
- Poorly secured or corroded connectors.
- Electronic issues:
- Failure of the ECM or BCM (Body Control Module).
- Defective cruise control module.
- External factors:
- Spilled liquid on the switch (e.g., coffee, soda).
- Overheating of electronic components.
Diagnostic Steps
- Visual inspection:
- Check the switch (steering wheel or dashboard) for physical damage or dirt.
- Test the buttons to ensure they operate freely.
- Fuse check:
- Consult the vehicle manual to locate the cruise control fuse. Replace if necessary.
- Accessing the wiring harness:
- Remove necessary components (e.g., steering wheel airbag, covers) to inspect wires and connectors.
- Use a model-specific wiring diagram to identify the “Resume” signal wire.
- Checking related systems:
- Ensure the ABS is functioning correctly (speed sensors affect cruise control).
Recommended Solutions
- Cleaning/Repair: If the switch is contaminated, clean it with an appropriate product.
- Replacement: Replace the switch, module, or damaged wires.
- Electronic diagnosis: Use an OBD-II scanner to check related codes (e.g., P0565, P0570) and analyze real-time data.
Practical Tips
- Avoid invasive repairs without an accurate electrical diagram.
- Consult a certified mechanic if basic tests do not resolve the issue.
- For recent vehicles, check for ECM software updates (some software bugs can simulate a P0567).
Summary
P0567 indicates a problem in the cruise control’s “Resume” circuit. Although not urgent, it requires inspection to prevent electrical complications. Start with simple checks (fuses, switch) before moving to complex tests.