P0047moderate severityPowertrain
Turbo/Supercharger Boost Control Solenoid Circuit Low
on 2009 Audi Q7 4.2L V8 · AWD
What this code means
Low voltage detected in the boost control solenoid circuit.
Symptoms
- Check Engine Light
- No boost
- Reduced power
Common causes
- Short to ground
- Faulty solenoid
- Wiring damage
Diagnostic steps
- Test circuit voltage
- Check for shorts
- Test solenoid
Repair notes
Repair wiring or replace solenoid.
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