Powertrain, generic (extended)

P22D5 Turbocharger Turbine Inlet Valve Position Sensor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P22D5 is a plausibility fault of the turbine inlet valve position signal. The voltage stays inside its electrical limits, yet it does not match what the module expects, for instance the reading lags the commanded position, fails to reach the learned end stops or does not change when the valve is moved. CARB requires input sensors of this kind to be checked for rationality as well as for circuit faults. Since a GM patent describes the valve being run in position control with sensor feedback, a wrong but believable reading directly corrupts the valve setting and thus boost. Causes include a sensor drifting with heat, a slipped magnet or linkage, and a valve that moves sluggishly so that position and command diverge. No manufacturer publicly documents P22D5.

Likely causes

Valve or linkage sluggish from soot, so position lags the command
Position sensor drifting or misaligned on the actuator
End positions not relearned after actuator replacement

Symptoms

  • Check engine light on
  • Jerky or delayed changeover between turbo stages
  • Boost fluctuates under steady throttle

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,500
Time0.5–4 h

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

Parts involved

turbine inlet valve

Related codes

P22D4P22D2P22D3P22D6P22D7

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