P0039 - Turbocharger/Supercharger Bypass Valve Control Circuit Range/Performance

System Information

Some Turbocharged / Supercharged systems can use a bypass valve (commonly called a dump valve) to relieve turbo boost pressure. The bypass valve will normally be vacuum operated with a solenoid controlling the vacuum to the valve.

Fault Code Explained

When this fault code is stored, the circuit signal is likely to be within it’s normal operating parameters but is not as expected for the current operating conditions

Recommended Tests