All OBD2 codes
P0299

Turbocharger / Supercharger Underboost Condition

High Severity — Fix Soon

P0299 means the turbocharger or supercharger is not producing the boost pressure the engine computer expects. The engine will run with reduced power (limp mode on some vehicles).

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Common Symptoms

  • Check engine light on
  • Loss of power, especially under load
  • Limp mode / reduced engine power
  • Whistling or hissing sound from a boost leak

Common Causes

  • 1.Boost leak (cracked or loose intake pipe, bad intercooler hose)
  • 2.Wastegate stuck open or wastegate actuator failure
  • 3.Clogged or failing turbocharger
  • 4.Faulty boost pressure sensor
  • 5.Carbon buildup restricting the turbo

Confirm the fault before replacing parts. Many codes share symptoms — run a free guided diagnosis to identify the actual cause for your specific vehicle.

Frequently Asked Questions

Can I drive with a P0299 code?

You can drive carefully, but the engine will have reduced power. A boost leak can worsen and damage the turbo if ignored. Diagnose before long trips.

What is the most common cause of P0299?

A boost leak from a loose or cracked intake pipe or intercooler hose. A visual inspection of all charge pipes is the best first step.

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