P2021

Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2

Q: 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.

Q: Can I just clear P2021?

It returns until the low-voltage fault in the sensor circuit is repaired.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2021 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX