P0299

What does P0299 mean?

Boost pressure is lower than the computer expects.

Can I drive with P0299?

A steady check-engine light with the car otherwise behaving normally usually means you can drive carefully to get it diagnosed — but a flashing light, shaking, lost power, or a strong fuel smell changes that. When in doubt, treat it as more serious. See Can I Drive It? for a quick read on your exact symptoms.

Common symptoms

• Check engine light
• Noticeable loss of power
• Sometimes a limp mode
• A whistle or hiss in some cases

Possible causes

Possible causes include — not “the part is definitely bad”:

• A boost leak in the plumbing
• A wastegate or control fault
• A turbocharger issue

What P0299 does not prove

It does not prove the turbocharger has failed. An under-boost code often comes from a leak, a hose, the wastegate, or a sensor rather than the turbo itself.

What you can safely check

• Whether it has dropped into a reduced-power mode
• For an obvious loose or split intake/boost hose when safe
• Whether the light is steady or flashing

What a shop may check

An example diagnostic direction, not a guaranteed procedure:

• Scan tool and live boost-pressure data
• The turbo/boost plumbing for leaks
• The wastegate or control system
• The turbocharger operation

What not to do

• Don’t assume the turbo has failed — boost leaks are common and cheaper
• Don’t keep driving hard in a limp mode

Generic OBD-II guidance — manufacturer-specific codes and causes vary by make, so always confirm against your vehicle. A code identifies a system or condition; it does not, on its own, prove which part has failed.