OBD-II code P2675 indicates an open circuit in the air cleaner inlet control system, which manages airflow into the engine via a motorized or vacuum-operated inlet door. This fault typically means the engine control module (PCM) has detected no continuity in the circuit controlling the inlet door position.
The motor or actuator responsible for moving the inlet door may have failed internally, causing an open circuit. This is the most common cause of P2675.
Wiring harnesses leading to the actuator may be frayed, corroded, or disconnected, creating an open circuit. Check for damage near the air cleaner housing or along the harness route.
A blown fuse or failed relay can interrupt power to the actuator, resulting in an open circuit. Refer to the vehicle’s fuse box diagram for the correct fuse/relay.
Corrosion or loose connections at the actuator plug or PCM connector can cause an open circuit. Inspect terminals for oxidation or looseness.
The inlet door or its linkage may be jammed or broken, preventing the actuator from functioning properly and triggering the code.
While uncommon, a malfunctioning PCM could fail to send or receive signals from the actuator circuit. This should only be considered after all other causes are ruled out.
While the vehicle may still run, driving with this code can lead to reduced engine performance, poor fuel economy, or potential long-term damage due to unfiltered air entering the engine. It’s best to diagnose and repair the issue promptly.
No, the PCM is rarely the cause of P2675. The issue is almost always due to a failed actuator, wiring problem, or mechanical failure in the air inlet system. Replace or reprogram the PCM only after all other causes are ruled out.
Use a multimeter to check for resistance across the actuator terminals (refer to service manual specs). You can also use a scan tool with bidirectional control to command the actuator and observe if it responds. If it doesn’t move or shows infinite resistance, it’s likely faulty.
This system optimizes airflow into the engine by adjusting the inlet position based on driving conditions (e.g., cold starts, high load, or dusty environments). It helps improve performance, fuel efficiency, and emissions.