P0299

What it means

Boost pressure under load is below the commanded value. Very common on turbodiesel and direct-injection turbo gasoline engines as the turbo system ages — typically a leaking boost pipe, a sticky variable-geometry vane assembly, or a wastegate that no longer holds.

Is it safe to drive?

This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.

Most likely causes

• Leak in intercooler pipe or hose

  high

  One of the most commonly reported causes for this code — check this first.

• VGT vanes stuck (diesel, soot buildup)

  high

  One of the most commonly reported causes for this code — check this first.

• Wastegate stuck open or weak spring

  medium

  A plausible cause — test and verify before replacing parts.

• Turbo bearing worn (preceded by oil consumption / smoke)

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P0299 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?