What are the common causes of P0049?

A sticking wastegate or boost control A valve letting boost run away. A failed boost pressure sensor reading low. A clogged air intake starving the turbo. Worn turbocharger A bearings or an unbalanced turbine. A failed boost control A solenoid.

Check the boost pressure sensor reading against a gauge. Inspect the wastegate and boost control A valve for sticking. Check the air intake and filter for a restriction. Listen to turbocharger A for bearing noise and check shaft play. Replace the boost control A solenoid or wastegate if stuck. Clear the code and retest.

P0049

Turbocharger/Supercharger A Turbine Overspeed

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0049 means Turbocharger/Supercharger A Turbine Overspeed.

Check these first

A sticking wastegate or boost control A valve letting boost run away
A failed boost pressure sensor reading low
A clogged air intake starving the turbo
Worn turbocharger A bearings or an unbalanced turbine
A failed boost control A solenoid

What to do next

Check the boost pressure sensor reading against a gauge
Inspect the wastegate and boost control A valve for sticking
Check the air intake and filter for a restriction
Listen to turbocharger A for bearing noise and check shaft play
Replace the boost control A solenoid or wastegate if stuck
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.