P0249moderate severityPowertrain
Turbocharger/Supercharger Boost Control B Circuit Low
on 2000 Audi A6 2.7L Turbo V6 · AWD
What this code means
The PCM detected a low voltage or signal in the boost control 'B' circuit. This often indicates a short to ground or a failed solenoid.
Symptoms
- Loss of boost pressure
- Reduced power
- Check engine light on
Common causes
- Short to ground in circuit
- Faulty boost control solenoid
- Damaged wiring or connector
- Open circuit at actuator
Diagnostic steps
- Retrieve trouble codes
- Measure circuit voltage at solenoid
- Check wiring for shorts to ground
- Replace solenoid if defective
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