What is the P0511 trouble code?
1 Answers
P0511 trouble code indicates an idle air control circuit malfunction. Possible causes include: IAC control circuit issues, connector faults, IAC actuator failure, or electronic control module problems. The IAC valve features a movable needle valve controlled by a precise stepping motor. When the throttle is closed, the IAC valve regulates idle speed by adjusting airflow through the bypass passage to accommodate different idle conditions. This code appears when the electronic control unit detects voltage in the IAC valve control circuit exceeding normal range. After troubleshooting, the trouble code must be cleared following the specific vehicle's prescribed clearing procedure. Never attempt to clear codes by disconnecting the battery negative terminal.