P201D
Intake Manifold Runner Control Actuator Internal Performance (Bank 1)
Internal self-diagnostics of the IMRC actuator on bank 1 report an off-spec condition — driver stage, position-feedback or thermal limit no longer matches the calibrated profile.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Actuator internal driver or sensor faultCommon
- Actuator overheated and deratedLess likely
Parts involved
- IMRC Actuator
- IMRC Position Sensor
P201D 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.