P0299: Turbocharger/Supercharger A Underboost Condition
Severity: medium
What it means: The turbocharger or supercharger is producing less boost than expected.
Safe to drive? Drivable gently. Get it checked, since boost leaks or turbo wear can get worse.
Common symptoms
- Noticeable loss of power
- Check-engine light
- Whistling or hissing under boost
Likely causes, ranked
- Boost leak (split hose, loose clamp, intercooler)DIY
- Sticking wastegate or actuatorShop
- Worn turbochargerShop
- Faulty boost pressure sensorShop
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What it means: The turbocharger or supercharger is producing less boost than expected.
Severity: Medium. Safe to drive? Drivable gently. Get it checked, since boost leaks or turbo wear can get worse.
DIY or shop?
Inspect the intercooler hoses and clamps first.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.
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