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 airflow for optimal performance. An intermittent signal suggests a loose connection, damaged wiring, or a failing sensor, potentially causing the flaps to operate erratically and affecting engine performance.
01. Most Common Causes
- Faulty intake manifold runner position sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Loose electrical connection at the sensor or PCM
- Carbon buildup on the IMRC flaps causing binding
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P2018.
Step 2: Visually inspect the sensor connector and wiring for damage, corrosion, or loose pins.
Step 3: Test sensor resistance and voltage supply using a multimeter per manufacturer specs.
Step 4: Check for carbon buildup on the intake manifold runner flaps and clean if necessary.
Step 5: If wiring and sensor test OK, inspect the PCM for faults or update software.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the issue can cause reduced engine performance and potential stalling. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for sensor replacement or wiring repair, but can be higher if the intake manifold needs cleaning or replacement.