Powertrain, generic (extended)

P22D0 Turbocharger Turbine Inlet Valve Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22D0 is logged when the drive circuit of the turbine inlet valve shows a voltage below the expected range, the classic sign of a short to ground in the wire or inside the actuator. GM lists P22D0 together with P22CF and P22D1 in the fault bundle of its high-pressure turbine bypass actuator in the 2017 and 2018 diesel OBD documents; any of them takes boost control out of closed loop. Because the exhaust valve sits right on the hot turbo housing, heat-brittle insulation that rubs through is a likely cause. Depending on how the driver is wired, the valve may then stay energized or never move, so exhaust skips the high-pressure stage at the wrong time or never. No public source gives GM's thresholds. P22D0 differs from P22CF by a short rather than a break.

Likely causes

Heat-damaged wire rubbing through to ground
Internal short in the valve actuator or control solenoid
Damaged output stage in the engine control module

Symptoms

  • Check engine light on
  • Power limited, boost too low or uneven
  • Code sets right after start without a test drive

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

P22CFP22D1P22D6

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