P201DIntake Manifold Runner Control Actuator Internal Performance (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P201D is for flap actuators with their own electronics: the bank 1 actuator, or the ECM's check of it, has found a fault inside the unit, such as a failed driver, sensor or self-test, while wiring and supply look normal. GM uses the code on its 2017 and 2018 diesels with a smart swirl actuator, but only as a member of the fault group that orders swirl control off, next to P2008–P2010, P201B, P2004 and P2006; the tables give no monitor row and no threshold for it. CARB requires flap systems that change charge motion to be checked for proper function, and lets makers check the shaft of one bank instead of every flap. Since internal faults cannot be repaired, the usual remedy is a new actuator or, where it is built in, a new manifold, after ruling out supply (P201B) and circuit codes. The bank 2 counterpart is P201E.
- What you may notice
- Malfunction indicator lamp on
- Swirl control switched off, slightly rougher combustion at low load
- Likely causes
- LikelyInternal electronics of the smart actuator failed
- PossibleActuator overloaded by sticking flaps, internal protection tripped
- RareActuator or engine software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.