P2021
Intake Manifold Runner Position Sensor/Switch Circuit High (Bank 2)
The IMRC position sensor on bank 2 reports a voltage above the upper threshold — usually a short to positive or an open ground.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Signal shorted to positiveCommon
- Sensor ground openPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- IMRC Position Sensor B2
- IMRC Wiring
P2021 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.