P2018
Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1
Fuel & air metering
Generic OBD-II
Low
What it means
P2018 means the signal from the bank 1 intake manifold runner position sensor is cutting out or reading erratically. This sensor reports whether the intake runner flaps are open or closed. The fault is usually an intermittent wiring or connector problem, so the main sign is the warning light rather than a strong change in performance.
Low
Can I keep driving? Safe to drive — this is an intermittent sensor-signal fault, so you may only see the warning light with little or no change in how the engine runs.
Common symptoms
What you'll notice
- Check-engine light on
- Occasional hesitation or a brief power dip
- Often no noticeable driving symptoms
Common causes
Most likely first
- Intermittent open, short, or loose connection in the runner position sensor wiringLikely
- Corroded or backed-out connector pin at the sensorCommon
- Failed intake manifold runner position sensorCommon
- IMRC actuator fault, or a faulty PCM — less commonLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and wiggle-test the bank 1 runner position sensor connector and harness while watching live data.
- Inspect the connector for corrosion, spread pins, or loose terminals and repair as needed.
- Check the sensor's reference voltage and ground; replace the position sensor if the signal drops out.
- If wiring and sensor are good, evaluate the actuator and PCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2018?+
Yes. It is an intermittent signal fault with little drivability impact, but it should be repaired so any related runner control faults are caught.
Can I just clear P2018?+
You can, and it may stay off for a while because the fault is intermittent, but it will return until the wiring or sensor issue is fixed.
Related codes
Often seen with P2018
Read & clear P2018 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX