What it means
The turbocharger turbine inlet valve is detected as stuck open. This can prevent the intended control of exhaust flow through the turbine and affect boost response.
At a glance
- Usually lights the check-engine light
How it works
The turbine inlet valve controls how exhaust gas reaches the turbine in a sequential or two-stage turbo system. P22D2 sets when the module detects that the valve remains open when it should close, so exhaust flow may not follow the commanded path. This can cause abnormal or reduced boost response.
Common causes
Most likely first.
- Valve seized open from carbon
- Carbon or debris buildup preventing free movement
- Component wear with age - mechanical play
Symptoms
- Check engine light on
- Reduced engine power or poor acceleration
- Possible abnormal boost response
How to diagnose it
- Record freeze-frame data and review available valve position and boost data to see when the open position was detected.
- Inspect the turbine inlet valve, its linkage, and nearby exhaust connections for damage or signs that the valve cannot seat.
- Check for carbon or debris around the valve that could prevent it from closing, following the manufacturer's inspection procedure.
- Inspect the valve actuator, connector, and wiring for binding, corrosion, or damage that could interfere with movement.
- If the valve moves freely, test commanded movement and position feedback using the manufacturer's procedure.
Common fixes
- Remove carbon or debris that is preventing the turbine inlet valve from closing.
- Repair damaged wiring or poor connector contact at the valve actuator.
- Repair or replace a binding actuator or linkage.
- Replace the turbine inlet valve if it remains stuck open after cleaning and inspection.
Can I keep driving?
Drive gently and avoid heavy loads because uncontrolled exhaust flow can cause poor boost response and reduced power. Stop if power loss is severe or you hear unusual turbo noise.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.