Trouble code · Powertrain · Generic (all makes)

P0299 Turbocharger/Supercharger 'A' Underboost Condition

The turbocharger (or supercharger) isn't producing as much boost pressure as the engine computer expects.

Safe to drive?
Drive with caution
Get it fixed soon
Scanner you need
Any OBD2 scanner
Even a basic code reader shows it
NHTSA complaints quoting it
99
Vehicle complaints, 2015–2025

Common causes

  • Boost leak from a cracked hose, loose clamp or intercooler
  • Faulty wastegate or wastegate actuator
  • Worn or failing turbo
  • Faulty boost pressure sensor
  • Clogged air filter

Symptoms

  • Loss of power, especially when accelerating
  • Limp mode
  • Whistling or hissing under boost

Can I drive with it?

Usually drivable, but power will be down and the car may go into limp mode. Get it checked soon – a failing turbo can get worse quickly.

Tip: Listen for a hiss under acceleration and check every intercooler hose and clamp before suspecting the turbo itself.

Which scanner reads it?

Any OBD2 scanner reads it. Live data comparing desired and actual boost helps tell a leak from a turbo problem.

Budget tools like the ANCEL AD310 read it; tools with live data and graphing – like the BlueDriver or OBDLink MX+ – help you find the cause. Not sure which fits you? Try the Find My Scanner quiz.

In the data

Of the vehicle complaints owners filed with NHTSA from 2015 to 2025, 99 quote P0299 – most often from Ford, Chevrolet, Buick owners. Complaints lean toward serious problems, so treat this as a sign of how often the code turns up in real reports, not how often cars get it.

Both sources are compared on the Trends page.

General information to help you understand a code – not a diagnosis. Your car’s service information or a qualified mechanic has the final word. See how we research.