Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Problem

Your vehicle has a sensor that checks position of a flap in the intake manifold which helps control air flow. If the sensor shows incorrect readings, like a flap stuck open or closed, it can mess with performance and fuel usage.

The Engine Control Module (ECM) expects the manifold runner position sensor to give readings within a specified range (typically between 0.5V to 4.5V depending on the position). When it sees a value outside that range, it triggers the P2018 code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check for any obvious wiring or connector damage around the intake manifold runner position sensor. Look for signs of wear or corrosion.
2. 2Ensure proper intake manifold operation by manually checking that the runner is moving freely with no obstructions.
3. 3Using a multimeter, check the voltage at the intake manifold runner position sensor. It should be between 0.5V and 4.5V while moving the flap through its range. If out of range, suspect the sensor.
4. 4If the sensor voltage is good, check the signal at the ECM to confirm it matches the sensor output. If there’s inconsistency, look into ECM issues or further wiring problems.
5. 5If all test values are within spec, consider replacing the intake manifold runner position sensor based on its condition.

• Faulty intake manifold runner position sensor
• Damaged wiring or connectors
• Faulty intake manifold actuator
• Vacuum leaks affecting manifold pressure

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