Trouble code
P0299
Turbocharger / Supercharger Underboost
What P0299 means
The engine is producing less boost than commanded.
Symptoms you may notice
- Sharp loss of power
- Limp mode
- Whistling or hissing under acceleration
Common causes, cheapest first
- Split or loose intercooler or charge pipe
- Failing wastegate or variable geometry actuator
- Leaking boost hose clamp
- Worn turbocharger
- Restricted air filter
Before you buy anythingA split charge pipe or a popped clamp is by far the most common cause and the cheapest to fix. Inspect every boost pipe joint before assuming the turbo has failed.
What to do next
- Confirm the code with your own scan tool, or have it read free at a chain parts store.
- Decode your VIN so you know your exact engine and build date.
- Work down the causes above from cheapest to most expensive.
- Search NHTSA for a recall or service bulletin covering this symptom on your vehicle.
- Read the engine buying guide before ordering.
P0299 is a generic OBD-II code, standardized across every make and model sold in the US from 1996 onward. The meaning is the same on any vehicle; the specific part and its location are not.
Parts
Parts commonly needed for P0299
These go to Amazon. We earn a commission if you buy, at no extra cost to you — see our affiliate disclosure. Which one you actually need depends on diagnosis — read the note above first.
Confirm fitment against your VIN on the listing page before ordering. A part that matches your year and model can still be wrong for your build date or engine code.