Intake Manifold Runner Position Sensor Circuit Intermittent (Bank 1)
The P2018 code indicates an intermittent fault in the intake manifold runner position sensor circuit on bank 1. This sensor monitors the position of the intake manifold runner control (IMRC) flaps, which adjust air flow for optimal performance. An intermittent signal can cause the engine control module (ECM) to lose track of flap position, leading to reduced power, poor fuel economy, and potential drivability issues. Common causes include a faulty sensor, damaged wiring, or a loose connector.
1. Most Common Causes
- Faulty intake manifold runner position (IMRP) sensor
- Intermittent open, short to ground, or short to power in the sensor circuit wiring
- Loose, corroded, or damaged terminals at the sensor connector
- Stuck or mechanically binding intake manifold runner control actuator/valve
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or stalling
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P2018 and check for related codes.
Step 2: Visually inspect the sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground signals using a multimeter; compare to manufacturer specifications.
Step 4: If wiring is intact, replace the intake manifold runner position sensor and clear codes.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as intermittent sensor failure can cause sudden power loss or stalling, posing a safety risk.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.