Powertrain, generic (extended)

P22D2 Turbocharger Turbine Inlet Valve Stuck Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P22D2 means the turbine inlet valve stays open after the module asked it to close. In a series two-stage system, an open valve lets exhaust skip the small high-pressure turbine, so low-speed boost and response suffer. In a parallel-sequential system such as Jaguar's 3.0 V6 diesel, where valves keep the secondary turbo out of the exhaust stream and intake until about 2,800 rpm, an open valve feeds that turbo too early and raises pumping losses. The module detects the fault by comparing commanded and measured valve position or the boost response, so it needs a drive at the relevant operating point. No manufacturer publicly documents P22D2 with thresholds. Soot and a seized pivot are typical; vacuum-driven designs add leaking control lines.

Likely causes

Soot or corrosion seizing the valve shaft in the open position
Leaking or detached control line on a vacuum-operated actuator
Actuator or linkage unable to close the valve
Position sensor reporting open although the valve moved

Symptoms

  • Check engine light on
  • Noticeable turbo lag at low engine speed
  • Higher fuel consumption
  • Reduced power mode

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,500
Time1–6 h

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

Parts involved

turbine inlet valve

Related codes

P22D3P22CFP22D5P0299

References: patents.google.com, topspeed.com, law.cornell.edu, en.wikipedia.org.