P201D code meaning
Intake Manifold Runner Control Actuator Internal Performance (Bank 1)
Powertrain system Generic code P20xx codes Check engine light
What P201D means
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.
P201D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P201D
- Malfunction indicator lamp on
- Swirl control switched off, slightly rougher combustion at low load
Common causes of P201D
- Most likelyInternal electronics of the smart actuator failed
- PossibleActuator overloaded by sticking flaps, internal protection tripped
- Less likelyActuator or engine software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Imrc actuatorImrc position sensor
What each part of P201D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 1D | The exact fault in that area. |
What to do next
- Note P201D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P201D
What does P201D mean?
P201D means "Intake Manifold Runner Control Actuator Internal Performance (Bank 1)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P201D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P201D fail an emissions test?
Yes, it can. P201D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P201D to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P201D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.