P22C6: Turbocharger Compressor Outlet Valve Control Circuit Low

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.

Medium severity. Can I keep driving?Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

Check the hoses, clamps, and intercooler
With the connector unplugged, check whether the signal wire is making contact with ground.
Compare commanded and actual pressure in live data
Check the actuator's movement
Check the vacuum hoses and the solenoid valve
Check the oil and the turbo shaft play before replacing it

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P22C6 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
2: Fuel injection
C6: Specific fault in that system

Frequently asked questions

Can I keep driving with code P22C6?

Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.

What causes code P22C6?

The most common causes are: control wire chafed through and touching ground; internal short in the valve actuator coil; moisture or corrosion bridging pins in the connector.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.