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DTC codes / P26xx · Computer and output circuits / P2676

P2676Air Cleaner Inlet Control Circuit Low

P2676 indicates that the powertrain control module (PCM) has detected a low voltage condition on the air cleaner inlet control circuit, which typically commands a flap or valve that regulates intake air temperature or flow. The circuit is expected to operate within a specific voltage range, and a low reading means the PCM sees voltage below the normal threshold, often due to a short to ground, a faulty actuator, or a wiring issue.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaComputer and output circuits

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Rough idle or hesitation during acceleration if the inlet control affects air temperature.
  • Reduced engine performance or fuel economy in some cases.
  • A noticeable change in intake air noise or whistle from the air cleaner assembly.
  • In cold weather, the engine may take longer to warm up or run poorly due to incorrect air temperature regulation.

Common causes, most likely first

  1. A short to ground in the air cleaner inlet control circuit wiring, such as a chafed wire touching metal.
  2. A faulty air cleaner inlet control actuator or solenoid that has failed internally and is drawing excessive current or shorting.
  3. Corroded or damaged electrical connectors at the actuator or PCM, causing high resistance or intermittent shorts.
  4. A defective powertrain control module (PCM) driver circuit, though this is less common.
  5. Aftermarket or modified air intake components that alter the circuit's electrical characteristics.
  6. Moisture intrusion into the actuator or connector, leading to corrosion and a short.

How to diagnose and fix it

  1. Use a scan tool to retrieve the code and check for any related codes, then clear the code and test-drive to see if it returns.
  2. Visually inspect the air cleaner inlet control actuator, its connector, and the wiring harness for obvious damage, corrosion, or loose connections.
  3. Disconnect the actuator and measure the resistance across its terminals; compare to the manufacturer's specification to determine if it is faulty.
  4. With the actuator disconnected and the key on, measure voltage on the control circuit at the actuator connector to check for a short to ground or an open circuit.
  5. If a short to ground is suspected, isolate the circuit by disconnecting the PCM and checking continuity to ground on the control wire.
  6. Repair any damaged wiring or connectors, then replace the actuator if it fails electrical testing.
  7. After repairs, clear the codes and verify the circuit operates correctly with a scan tool and test drive.

Don't overlook the air cleaner inlet actuator

  • A common misdiagnosis is to replace the PCM when the real problem is a simple chafed wire in the harness near the air cleaner, so always perform a thorough visual and continuity check first.
  • The air cleaner inlet control circuit often shares a ground with other sensors; a bad ground can set this code along with others, so check ground integrity before condemning the actuator.
  • Some vehicles use a vacuum-operated inlet control rather than an electric actuator, and a vacuum leak can cause symptoms similar to an electrical fault, so verify the system type before testing.
  • The code can be set intermittently by water intrusion after driving through deep puddles or car washes, so inspect for moisture in the connector and apply dielectric grease during repair.
  • A faulty actuator may still function mechanically but have incorrect resistance, so always compare measured values to specifications rather than relying on a simple click test.

Can I keep driving with P2676?

The vehicle is generally safe to drive with this code because it rarely affects engine operation severely, but avoid prolonged driving if you notice performance issues, and address the fault promptly to prevent potential secondary problems.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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