P22CC

Code

Generic P — Powertrain

Turbocharger Compressor Outlet Switching Valve Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 27 EN: 36 RU: 26

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Page language: EN

Causes

Open or short in wiring to the compressor outlet switching valve (short to battery/ignition voltage)
Faulty compressor outlet switching valve (stuck or internal short in solenoid/actuator)
Corroded, damaged or loose connector at the valve or ECM
Poor or missing ground for the actuator circuit
Failed ECM or internal driver fault
Aftermarket modifications or recent repairs that disturbed the harness

Symptoms

Check Engine Light (MIL) illuminated
Reduced engine power or limp-home mode
Poor throttle response or hesitation under boost
Uncommanded boost levels (underboost or overboost) depending on valve position
Audible turbo whine, flutter or unusual turbo noise
Stored related boost or turbo control fault codes

What to check

Read and record freeze-frame and live data related to turbo control and valve position/duty
Verify battery voltage and engine grounds are within spec
Visually inspect connector and wiring to the compressor outlet switching valve for corrosion, damage, or pin push-out
Backprobe valve connector and measure control voltage with key on/engine running while commanding valve
Measure coil resistance at the valve (compare to specification) and check for continuity to ECM
Wiggle test wiring while monitoring live voltage/lines for intermittent faults

Signal parameters

Typical actuator coil resistance: commonly ~5–50 ohms (manufacturer-specific) — compare to spec
Expected control voltage: approx. 0–12 V depending on design; ECM may drive via PWM/duty cycle rather than steady voltage
Command signal: 0–100% duty cycle (or 0–12 V equivalent) when ECM actuates the valve
Short/high condition: measured steady voltage near battery positive (approx. battery voltage) on control pin when valve not commanded
Open/low condition: no continuity or infinity ohms from valve to ECM or very low/zero voltage where a signal is expected

Diagnostic algorithm

Retrieve freeze-frame data and note conditions when the code set (engine load, RPM, battery voltage, temp).
Clear the code and re-run to verify repeatability under the same conditions.
Visually inspect the valve, connector and wiring harness for damage, heat exposure, corrosion, and secure mounting.
With key ON (engine off) and using a DVOM, measure voltage at the valve control pin relative to ground. Compare to battery voltage and expected idle values.
Command the valve ON/OFF using a bidirectional scanner while watching voltage or duty cycle. Confirm ECM is attempting to drive the circuit.
Measure coil resistance at the valve. If resistance is abnormally low (short) or high/open, replace the valve.
Check continuity between the valve control pin and the ECM driver pin. Check for short to battery (voltage present with ignition off) and short to ground.
Inspect and test ground(s) associated with the valve circuit. Repair any poor grounds.
If wiring and valve check good, probe ECM output. If ECM output is stuck high while commanded off and wiring is good, suspect ECM driver fault — verify with OEM diagnostic guidance before ECM replacement.
After any repair, clear codes and road-test under conditions that previously caused the fault; confirm code does not return.

Likely causes

Connector corrosion or loose terminal at the valve
Short to battery/ignition voltage on the valve control wire
Failed valve actuator (internal short/open)
Wiring chafing or damage near the turbo or firewall

Fault status

⚠️ Status

Control circuit for turbocharger compressor outlet switching valve is reporting a high voltage condition. Inspect valve, wiring, connectors, and ECM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours