P2021
Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2
Fuel & air metering
Generic OBD-II
Low
What it means
P2021 means the PCM reads a low-voltage signal from the intake manifold runner position sensor on bank 2. This sensor confirms where the intake runners are positioned, so the fault mainly affects low-rpm torque and emissions monitoring. The engine still starts and drives, usually with just a check-engine light.
Low
Can I keep driving? Yes — the engine starts and runs; you may notice slightly reduced low-rpm power until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Slightly reduced low-end power or throttle response
- Minor hesitation at certain rpm
Common causes
Most likely first
- Short to ground or open in the runner position sensor circuit on bank 2Likely
- Faulty intake manifold runner position sensor/switchCommon
- Damaged or corroded wiring or connector at the sensorCommon
- Sticking or seized runner control linkage on bank 2Less often
- Failed powertrain control module (PCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the runner position sensor connector and wiring for damage or a short to ground.
- Check the sensor's signal voltage against spec; a stuck-low reading points to the sensor or its wiring.
- Verify the runner control linkage moves freely and isn't stuck at one end.
- Replace the position sensor if it fails testing. Clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P2021?+
Yes. This sensor reports intake runner position and mainly affects low-rpm torque and emissions, not whether the car runs.
Can I just clear P2021?+
It returns until the low-voltage fault in the sensor circuit is repaired.
Related codes
Often seen with P2021
Read & clear P2021 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