P0049critical severityPowertrain
Turbo/Supercharger Turbine Overspeed
on 2000 BMW 525i 2.5L I6 M54 · RWD
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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Other Powertrain codes on this vehicle
29CC
Misfire Cylinder 1
29CD
Misfire Cylinder 2
29CE
Misfire Cylinder 3
29CF
Misfire Cylinder 4
29D0
Misfire Cylinder 5
29D1
Misfire Cylinder 6
29D2
Misfire Cylinder 7
29E0
Lambda Additive/Idle Adaptation Limit, Bank 1
29E1
Lambda Additive/Idle Adaptation Limit, Bank 2
29E2
Lambda Multiplicative Part-Load Adaptation Limit, Bank 1