Air Bypass Valve Circuit Malfunction
The air bypass valve, which helps control idle speed and emissions by letting air bypass the throttle, isn't working properly. It's like a stuck door that should open and close smoothly but is either stuck or not responding to commands.
The ECM monitors the air bypass valve solenoid's electrical circuit and response behavior. It checks for proper voltage signals, current draw, and whether the valve opens/closes as commanded during idle adjustment.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Coil Resistance | 5-15 ohms | Open circuit (infinite) or shorted (<2 ohms) |
| Valve Response Time | 50-200 ms | No response or delayed >300 ms |
Code P1567 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1567 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.