Powertrain, generic (extended)

P22D7 Turbocharger Turbine Inlet Valve Position Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22D7 is logged when the position signal of the turbine inlet valve rises above its highest valid voltage. A reading pinned near the reference level usually comes from an open sensor ground, a signal wire touching the 5-volt reference or battery voltage, or a failed sensor element, not from the valve itself. Like its low-voltage counterpart P22D6, this is a pure circuit check that runs continuously and does not depend on load. Without valid feedback, the module can no longer run the valve in position control as described in the GM two-stage patent, so it typically fixes the valve and limits boost. No manufacturer publicly documents P22D7. Inspecting the ground pin and wiring near the hot exhaust side usually finds the fault faster than swapping the actuator.

Likely causes

Open or high-resistance sensor ground
Signal wire shorted to the 5-volt reference or battery voltage
Internal failure of the position sensor

Symptoms

  • Check engine light on
  • Reduced power, valve held in fallback position

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

turbine inlet valve

Related codes

P22D4P22D6P22D5P22D8

References: patents.google.com, patents.google.com, law.cornell.edu.