P2676

Code

Generic P — Powertrain

Air Cleaner Inlet Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 48 RU: 35

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Page language: EN

Causes

Blown fuse or poor battery supply to the actuator circuit
Open or high-resistance wiring/connector between ECM and actuator (broken wire, corrosion)
Short to ground on the actuator control wire
Failed air cleaner inlet control actuator/solenoid/motor
Corroded/loose connector pins or water intrusion in connector
PCM/ECM driver output fault or internal short

Symptoms

Check Engine Light (MIL) illuminated
Possible reduced engine performance or restricted airflow at certain conditions
Air cleaning inlet/snorkel not opening or closing (may be audible if actuator is mechanical)
Reduced fuel economy or increased intake noise in some vehicles
Fault stored in ECM with possibly related drivability issues under certain conditions

What to check

Read and record freeze frame data and pending codes with a scan tool
Inspect fuses and relays related to intake/air inlet and PCM power
Visually inspect actuator, connector, and wiring for damage, corrosion, or water
Back-probe actuator connector and measure voltage/ground while commanded by scan tool
Check battery voltage and ground integrity
Perform wiggle test on harness with engine running and while commanding actuator

Signal parameters

Typical control signal: switched 0–12 V (or PWM) from ECM/driver; reference or control circuits often use 5 V logic—consult vehicle manual
Expected idle/park voltage when not commanded: close to 0 V or battery voltage depending on design
‘Low’ condition usually defined as voltage below manufacturer threshold (example:
Actuator coil resistance: typically a few ohms to a few hundred ohms depending on device; check specification sheet

Diagnostic algorithm

Connect a professional scan tool, read/set P2676 and related codes, and note freeze frame data
Inspect fuses, relays, battery voltage, and ground points for the PCM and inlet actuator circuit
Visually inspect actuator, wiring harness, and connectors for damage, corrosion, or water intrusion; repair as necessary
With connector connected, back-probe the control and power pins; command the actuator ON/OFF with a scan tool and observe voltage/ground changes
If control wire reads low (near ground) while commanded, check for short to ground; disconnect actuator and measure control wire voltage—if voltage returns to normal, suspect actuator short
Measure coil resistance of actuator (with connector disconnected) and compare to specification; substitute known-good actuator if uncertain
Check continuity between actuator connector and PCM pin; repair any open or high-resistance circuits
If wiring and actuator test good but circuit still reads low, follow OEM ECM driver tests; if ECM driver fault suspected, consult manufacturer procedures before PCM replacement
After repairs, clear codes and perform functional test and road test to ensure code does not return

Likely causes

Connector corrosion or water ingress at the actuator
Open/shorted harness between ECM and inlet actuator
Failed actuator (stuck or no response)
Blown fuse or low battery voltage during operation

Fault status

⚠️ Status

Air Cleaner Inlet Control Circuit Low - voltage on the actuator control circuit below expected threshold. Possible wiring short, open, or failed actuator/driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours