Air Cleaner Inlet Control Circuit High
The P2677 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the air cleaner inlet control circuit. This circuit controls the air intake system, often involving a flap or valve that regulates the amount of air entering the engine. A high voltage reading suggests a short to power, a faulty actuator, or a wiring issue. This can affect engine performance and fuel efficiency.
01. Most Common Causes
- Short to power in the air cleaner inlet control circuit wiring
- Faulty air cleaner inlet control actuator
- Corroded or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or hesitation
- Poor fuel economy
- Possible rough idle or stalling
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the wiring and connectors for damage, corrosion, or shorts.
Step 3: Test the air cleaner inlet control actuator with a multimeter for proper resistance and operation.
Step 4: Check for voltage at the actuator connector with the ignition on; compare to manufacturer specs.
Step 5: If wiring and actuator are good, test the PCM output or consider PCM replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but reduced performance and fuel economy may occur. Prolonged driving could lead to further issues, so it's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing an actuator may cost more, while cleaning a connector is cheaper.