What it means
The compressor outlet switching valve control circuit has a voltage above the expected range. This indicates an electrical circuit fault; the code alone does not establish a boost-pressure fault.
At a glance
- Usually lights the check-engine light
How it works
The compressor outlet switching valve routes airflow between compressor stages on systems with staged or twin turbochargers. The control module monitors its electrical control circuit, and this code sets when voltage rises above the expected range, often because the circuit is shorted to battery voltage; this code alone does not establish a boost-pressure problem.
Common causes
Most likely first.
- Short to B+
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Check engine light on
- Reduced engine power or poor acceleration
- Delayed or inconsistent boost response
How to diagnose it
- Record freeze-frame data and check related turbocharger codes to identify when the switching-valve circuit read high.
- Inspect the switching-valve connector and harness for corrosion, damaged pins, or wiring pinched against a powered source.
- Use the wiring diagram to check the control circuit for a short to B+ and confirm connector pins are seated.
- With the valve and module disconnected, test circuit continuity and isolation according to the manufacturer's procedure.
- If the circuit passes, test the switching valve and module output using the specified diagnostic checks.
Common fixes
- Repair wiring pinched against a B+ source.
- Clean or repair corroded or damaged switching-valve connector pins.
- Replace harness sections with damaged insulation or an internal short.
- Replace the switching valve if it fails the manufacturer's electrical test.
Can I keep driving?
If the engine runs normally, a cautious drive may be possible, but avoid hard acceleration and heavy loads. Staged boost may respond unpredictably and limit acceleration, so stop if power loss or abnormal turbocharger noise occurs.
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.