P22D1 code meaning
Turbocharger Turbine Inlet Valve Control Circuit High
Powertrain system Generic code P22xx codes Check engine light
What P22D1 means
P22D1 tells you the drive circuit of the turbine inlet valve reads too high, which usually means a short to battery voltage or an actuator that draws overcurrent. GM assigns P22D1, along with P22CF and P22D0, to its high-pressure turbine bypass actuator in the 2017 and 2018 diesel OBD tables, and boost control drops out of closed loop when the fault is active. The GM patent on series-sequential turbocharging describes a current sensor on this valve, which is how an overcurrent can be seen directly. Once the driver protects itself and shuts down, the valve no longer follows commands. Compared with its siblings, the search concentrates on positive-feed contact and the actuator winding. No public source gives GM's threshold values for P22D1.
P22D1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P22D1
- Check engine light on
- Reduced power, boost control in fallback mode
- Fault comes back as soon as the valve is driven
Common causes of P22D1
- Most likelyActuator wire shorted to a battery-voltage feed
- PossibleActuator winding shorted or mechanically jammed, drawing overcurrent
- Less likelyFaulty output stage in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbine inlet valve
What each part of P22D1 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| D1 | The exact fault in that area. |
What to do next
- Note P22D1 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 P22D1
What does P22D1 mean?
P22D1 means "Turbocharger Turbine Inlet Valve Control Circuit High". P22D1 tells you the drive circuit of the turbine inlet valve reads too high, which usually means a short to battery voltage or an actuator that draws overcurrent. It is a generic code, so it means the same on every make.
Is it safe to drive with P22D1?
Drive gently and only to a workshop. With P22D1 the car can go into limp mode (reduced power) to protect itself.
Will P22D1 fail an emissions test?
Yes, it can. P22D1 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 P22D1 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P22D1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.