Powertrain, generic (extended)

P22D1 Turbocharger Turbine Inlet Valve Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Actuator wire shorted to a battery-voltage feed
Actuator winding shorted or mechanically jammed, drawing overcurrent
Faulty output stage in the engine control module

Symptoms

  • Check engine light on
  • Reduced power, boost control in fallback mode
  • Fault comes back as soon as the valve is driven

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

turbine inlet valve

Related codes

P22CFP22D0P22D7

References: gsi.ext.gm.com, patents.google.com, law.cornell.edu.