P2020
Intake Manifold Runner Position Sensor/Switch Circuit Low (Bank 2)
The IMRC position sensor on bank 2 reports a voltage below the lower threshold — typically a short to ground or a sensor with very low resistance.
- 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 groundCommon
- Sensor element shortedPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- IMRC Position Sensor B2
- IMRC Wiring
P2020 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.