PowertrainP0299
CautionSeverity: Caution - get it checked when you can
Turbocharger/Supercharger Underboost
Key terms: Turbocharger: an exhaust-driven fan that pushes extra air into the engine · Supercharger: an engine-driven fan that pushes extra air into the engine · Boost pressure: extra air pressure made by a turbo or supercharger · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The turbocharger or supercharger is making less boost than the engine computer expects. The car feels low on power.
2Common causes
- Leaking or split boost/intake hose
- Faulty boost control valve (wastegate or diverter)
- Faulty boost pressure sensor
- Turbocharger wear or damage
- Sticking variable-vane mechanism
3Can I drive?
Usually safe to drive gently. Power will be reduced. Avoid hard acceleration and have it checked soon.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 38
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0299 | Data Record Brand | Powertrain |
| BAIC Motor | P0299 | Underboost Brand | Powertrain |
| BYD | P0299 | Turbocharger/Supercharger Underboost Brand | Powertrain |
| Chery | P0299 | Permanent Governor Deviation In PCR Brand | Powertrain |
| Chrysler | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Daewoo | P0299 | Boost Pressure Low Pressure Brand | Powertrain |
| Daihatsu | P0299 | VN turbo closed side abnormal Brand | Powertrain |
| DFFS | P0299 | Turbocharger low pressure Brand | Powertrain |
| DFFX | P0299 | Turbocharger low pressure Brand | Powertrain |
| DFXK | P0299 | Turbo boost insufficient Brand | Powertrain |
| EOBD | P0299 | Turbolader/kompressor 'A' for lavt ladetryk Brand | Powertrain |
| Ford | P0299 | This service function should be run after the cause and rectification of of the following DTC has been carried out Brand | Powertrain |
| Geely | P0299 | Turbo Boost Insufficient Brand | Powertrain |
| GM | P0299 | Turbocharger engine underboost Brand | Powertrain |
| Great Wall | P0299 | Turbocharger/Supercharger Underboost Brand | Powertrain |
| Hafei | P0299 | Turbocharger/Supercharger Underboost Brand | Powertrain |
| Holden | P0299 | Engine Underboost Brand | Powertrain |
| Honda | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Hyundai | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Isuzu | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Land Rover | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Mahindra | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Maserati | P0299 | Turbocharger underboost Brand | Powertrain |
| Mazda | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Mitsubishi | P0299 | Turbocharger underboost Brand | Powertrain |
| Opel | P0299 | Turbocharger engine underboost Brand | Powertrain |
| Perodua | P0299 | VN turbo closed side abnormal Brand | Powertrain |
| Peugeot | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Porsche | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Proton | P0299 | Turbocharger underboost Brand | Powertrain |
| Saab | P0299 | Turbocharger Engine Underboost Brand | Powertrain |
| MG (SAIC) | P0299 | Turbocharger Underboost Brand | Powertrain |
| Subaru | P0299 | Turbocharger/Supercharger Underboost SAE | Powertrain |
| Suzuki | P0299 | Turbocharger / Supercharger 'A' Underboost Condition Brand | Powertrain |
| SWM Motor | P0299 | Turbo is not supercharged enough Brand | Powertrain |
| Tata | P0299 | Boost Control Error Brand | Powertrain |
| Toyota | P0299 | Booster boost pressure insufficient Brand | Powertrain |
| Volkswagen | P0299 | Boost pressure regulation: control range not reached Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 9
These 7-character codes are manufacturer-specific variants of P0299 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P029900 | Der Ladedruck des Abgasturboladers 1 weicht bei niedriger Motordrehzahl vom Sollwert ab. Brand | Powertrain |
| Hyundai | P029900 | If boost pressure sensor output value is lower than target value for more than 6 sec. under engine speed over 1500 RPM and amount of fuel injection 20mg/hub condition ECM sets DTC. This fault might be caused by air leakage on intake system Brand | Powertrain |
| SsangYong | P029900 | Turbocharger Underboost Condition Brand | Powertrain |
| Volvo | P029900 | If the diagnostic trouble code (DTC) is generated together with ECM- there is leakage from th hose or connection between the turbo unit and the throttle module Brand | Powertrain |
| Volkswagen | P029900 | Turbo/Super Charger Underboost Brand | Powertrain |
| Mercedes-Benz | P029909 | The boost pressure of turbocharger 1 is too low. There is a component fault. Brand | Powertrain |
| Sprinter | P029909 | No description available | Powertrain |
| Mercedes-Benz | P029922 | No description available | Powertrain |
| Sprinter | P029922 | No description available | Powertrain |
6Related codes
Browse Pxxx codes or P029xx codes.