P0049critical severityPowertrain
Turbo/Supercharger Turbine Overspeed
on 2019 Audi A6 3.0L V6 TFSI · AWD
What this code means
The PCM detected the turbocharger turbine is spinning faster than the maximum allowed speed.
Symptoms
- Check Engine Light
- Whining noise from turbo
- Excessive boost
- Possible engine damage
Common causes
- Wastegate stuck closed
- Boost control solenoid failure
- Overboosting condition
- Exhaust restriction
Diagnostic steps
- Check wastegate operation
- Test boost control solenoid
- Monitor boost pressure
- Inspect turbo for damage
Repair notes
Immediately address to prevent engine damage. Repair wastegate or boost control system.
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