P0049critical severityPowertrain
Turbo/Supercharger Turbine Overspeed
on 2021 Audi A4 2.0L I4 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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1