OBD2 fault code
HighP0299
Turbocharger/Supercharger Underboost Condition
The code identifies an implausible condition in the monitored system. The component named in the code is not automatically the defective part.
What does P0299 mean?
Turbocharger/Supercharger Underboost Condition. The engine or vehicle control system detected that a measured value, control response, or communication signal was outside the expected range.
Common symptoms
- noticeable power loss
- limp mode under load
- hissing, whistling, or smoke
Likely causes
- leaking charge-air hose or intercooler
- turbocharger or wastegate control fault
- boost sensor, vacuum supply, or exhaust restriction issue
Sensible diagnostic order
- pressure-test charge-air system for leaks
- log requested and actual boost
- inspect vacuum system and turbo mechanism
Can I continue driving?
Only if the vehicle runs normally; avoid heavy load. If the check-engine light flashes, the engine shakes strongly, warning messages increase, or power drops significantly, stop and arrange professional assistance.
This information is a diagnostic aid and does not replace inspection by a qualified workshop. Manufacturer-specific definitions may differ.
FAQ
Can I continue driving with P0299?
Only if the vehicle runs normally; avoid heavy load.
Does P0299 always identify a defective part?
No. A fault code identifies a monitored system or implausible condition. Wiring, voltage, leaks, and related components must also be checked.
How can DiagnostiX help with P0299?
DiagnostiX reads the code from the vehicle, assigns it to the vehicle profile, and displays relevant live values and a structured explanation.