Powertrain, generic (extended)

P22C6 Turbocharger Compressor Outlet Valve Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22C6 is stored when the control line of the compressor outlet valve sits at a voltage that is too low for the current command, which normally points to a short to ground somewhere between the module and the valve. Whether the valve then stays permanently energized or never moves depends on whether the engine control module switches the ground side or the supply side of the coil. The module checks this electrically and needs no driving test, so the code can appear right after start. In a twin-path or two-stage boost layout the valve is meant to open or close one compressor branch on demand; a grounded line therefore leaves that branch in a fixed state. No manufacturer publicly documents P22C6; the description rests on the CARB output-component rules and published two-stage designs. Expect limited boost and a lit warning lamp.

Likely causes

Control wire chafed through and touching ground
Internal short in the valve actuator coil
Moisture or corrosion bridging pins in the connector
Damaged output stage in the engine control module

Symptoms

  • Check engine light on soon after starting
  • Boost limited, engine feels flat under load
  • Possible blown fuse if the short pulls heavy current

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–450
Time0.5–2.5 h

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

Parts involved

diverter valve

Related codes

P22C5P22C7P22CB

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