P0299: Turbo/Supercharger Underboost Condition
90 vehicles · 23 makes
P0299 is an OBD-II diagnostic trouble code meaning “Turbo/Supercharger Underboost Condition.” The turbo or supercharger is not producing the expected boost pressure. Causes noticeable loss of power. This code appears across 90 vehicle models from 23 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0299, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (90)
Supercharger Nose Cone Bearing and Clutch Wear
Turbocharger Failure
3.0T Turbo Wastegate Rattle and Actuator Failure
Turbocharger Oil Strainer Blockage Causing Engine Stall (4.0T NHTSA Recall)
Turbocharger Oil Supply Filter Clogging (4.0T TFSI)
Excessive Oil Consumption (2.0T TFSI Engine)
EA839 Water Pump Internal Leak and Vacuum System Contamination (2.9T)
EA839 3.0T Water Pump Internal Leak Causing Cascade Failures
Turbo Wastegate Rattle and Carbon Buildup
2.7T Turbocharger Oil Supply/Heat-Related Wear Leading to Turbo Failure and Smoke
IS20 Turbocharger Wastegate Rattle and Actuator Failure
Turbocharger Oil Strainer Blockage and Engine Stall (4.0T NHTSA Recall)
Turbocharger Oil Supply Filter Clogging (4.0T TFSI)
B5 2.7T Turbocharger Failure
S55 Crank Hub Slip/Failure
S55 Plastic Charge Pipe Cracking
Plastic Charge Pipe Blow-Off Under Boost
Plastic Charge Pipe Failure Under Boost
B58 Charge Pipe Pop-Off Under Boost
Turbo Wastegate Rattle at Idle
S58 Plastic Charge Pipe Cracking Under Boost
S58 Plastic Charge Pipe Cracking Under Boost
N54 Twin Turbo Wastegate Rattle - E89 Z4 sDrive35i/35is
N54 Charge Pipe Failure (135i / 1M)
N54 Spark Plug & Ignition Coil Failure (135i / 1M)
Electric Water Pump Failure - All Turbocharged Models
N54 Wastegate Rattle & Turbo Failure (135i / 1M)
S63 V8 Twin-Turbocharger Failure - F10 M5
Turbo Charge Pipe Failure - 428i/435i/440i F32/F33/F36
S63/S63TU Ignition Coil Premature Failure
N63 Turbocharger Failure - F01/F02 750i/750Li
Turbo Charge Pipe Failure - F22/F23 228i/230i/M240i
Turbo Charge Pipe Failure - F87 M2/M2C
S63 Turbo Coolant Line Plastic T-Fitting Failure (Hot-V Design) - E70 X5 M
N54 Fuel Injector Failure (135i / 1M)
B48/B58 Electric Water Pump & Thermostat Failure - G29 Z4
N63TU3 Valve Stem Seal Failure & Oil Consumption (M850i)
S63 Twin Turbo Wastegate Rattle - E70/F85 X5 M
Turbocharger Wastegate Rattle (N55, N20, B58 Engines)
Charge Pipe Cracking Under High Boost (S58 Engine)
4.2L Blackwing Twin-Turbo V8 Intercooler Coolant Leak
Twin-Turbo V6 Squealing Noise on Acceleration
2.0T LTG Turbo System Issues - PCV and Wastegate
2.0T LTG Turbo System Issues - PCV and Wastegate
2.0T LSY Engine - Valve Cover/PCV and Coolant Issues
2.0T LSY Engine - PCV and Turbo Coolant Line Issues
3.0L Twin-Turbo V6 Wastegate Actuator Failure
1.4L Turbo PCV Valve Cover Diaphragm Failure
1.5T Turbo PCV Valve and Oil Leak Issues
2.0L Turbo (LTG) Engine Problems
Turbocharger Oil Leak and Failure
1.4T Ecotec Turbo and Coolant Issues
Turbo Oil Feed Line Leak (1.4T LUJ/LUV)
1.5T LFV/LYX Engine PCV System and Oil Consumption
1.4L Turbo Wastegate Actuator Failure
1.4T Turbo Oil Feed Line Leak and PCV Issues
6.7L Power Stroke Early-Generation Turbocharger Failure (2011-2014)
3.5L EcoBoost Twin Turbocharger Failure
2.0L EcoBoost Cold-Start Hesitation and Bucking at Low Speeds
6.7L Power Stroke Turbocharger Bearing and Actuator Failure
Super Coupe Supercharger and Intercooler Failure
7.3L Powerstroke Turbo Pedestal O-Ring Leak
Turbo Wastegate Actuator Sticking Causing Limp Mode
Turbo Wastegate Rattle on Cold Start
2.3L Turbo VVT Actuator and Turbocharger Failure
K04 Turbocharger Failure and Boost Leaks
Turbocharger Oil Feed Line Leak and Turbo Failure
Turbocharger Oil Starvation and Failure
Turbocharger Seal Failure and Oil Burning
Turbocharger Failure/Wastegate Rattle
2.0T Turbocharger Wastegate Rattle and Failure
Early MK7 IHI Turbocharger Failure
Turbo Diverter Valve (DV) Failure and Boost Leak
Turbocharger Wastegate Rattle
IS20 Turbocharger Failure
G60 Supercharger Failure
Diverter Valve (DV) Failure
PCV System Failure Causing Oil Leaks and Engine Damage
T5/T6 Engine Excessive Oil Consumption
Turbocharger Failure and Wastegate Rattle
Electronic Throttle Module (ETM) Failure
T5 Turbocharger Failure from Oil Starvation
T6 3.0L Twin-Scroll Turbo Failure and Oil Leaks
T4/T5 Turbocharger Oil Feed Line Leak
T6 Twin-Charged Engine Supercharger Drive Belt and Turbo Oil Line Leak
T6 Supercharger Electromagnetic Clutch Failure
2.5L T5 PCV Oil Trap/Breather Box Failure
FAQ
What does P0299 mean?
P0299 stands for "Turbo/Supercharger Underboost Condition." The turbo or supercharger is not producing the expected boost pressure. Causes noticeable loss of power.
What are the most common causes of P0299?
The most common causes of P0299 are: Boost leak in intercooler piping, Worn turbo bearings, Stuck or leaking wastegate, Failed boost control solenoid, Clogged air filter or intercooler. The specific cause varies by vehicle.
How much does it cost to fix P0299?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0299?
Au7o has documented P0299 across 90 vehicle models from 23 manufacturers: Audi, BMW, Cadillac, Chevrolet, Chrysler, Citroën, Dodge, Fiat, Ford, GMC, Honda, Hyundai, Kia, MINI, Mazda, Mercedes-Benz, Nissan, Peugeot, Renault, Subaru, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.