P0299
Turbocharger or supercharger underboost condition
The ECU has detected less boost pressure than expected under the monitored operating conditions.
What this code means
The ECU has detected less boost pressure than expected under the monitored operating conditions.
Possible causes
- Boost leak in intake pipework
- Turbocharger control fault
- Wastegate or actuator problem
- Restricted intake or exhaust
- Turbocharger wear or damage
Common symptoms
- Check engine light
- Reduced power
- Limp mode
- Poor acceleration
- Possible unusual turbo or intake noise
Checks to make
- Check for related boost-pressure codes
- Inspect boost hoses and intercooler connections
- Review requested versus actual boost data
- Inspect turbo actuator and control system according to manufacturer procedure
Safety
- Turbochargers and exhaust components become extremely hot. Allow the engine to cool before inspection.
Model notes
Exact causes vary significantly between petrol, diesel and different boost-control systems.