P22C9 — Turbocharger compressor outlet valve — stuck closed

P22C9 concerns turbocharger compressor outlet valve. The monitor reports that the controlled mechanism remains in the closed state. The code names the compressor outlet valve. It should not automatically be relabeled as a wastegate or turbine-inlet valve fault.

Affected system: Turbocharger valve control

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Implausible sensor or switch signal, poor ground, connector corrosion, or wiring damage
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
• Repair the verified cause and confirm the code does not return

Also written as: P22C9-00, P22C900 (some scan tools add the fault-type byte, e.g. -00).