What does P0299 Turbocharger/Supercharger A Underboost Condition mean?
The P0299 Turbocharger/Supercharger A Underboost Condition OBD code refers to a condition where the engine control module (ECM) has detected that the turbocharger or supercharger is not providing the normal amount of boost or pressure.
This code can apply to various vehicles that are equipped with a turbocharger or supercharger, such as Ford, GMC, Chevy, VW, Audi, Dodge, Hyundai, BMW, Mercedes-Benz, Ram, Fiat, and more.
When operating correctly, a turbocharged or supercharged engine pressurizes the air going into the engine, allowing for increased power output.
However, if this code is set, you may notice reduced power output.
There are several potential causes for this code, including intake air restrictions, turbocharger or supercharger issues, faulty sensors, low fuel pressure, and more.
It is important to address this issue promptly to avoid further damage and costly repairs.
P0299 Symptoms
- MIL (Malfunction indicator lamp) illumination
- Reduced power output from engine, possibly in a u0027limpu0027 mode
- Unusual sounds from the engine/turbo
Possible P0299 Causes
- Intake (induction) air restriction or leak
- Failed or damaged turbocharger (sticking, binding, etc.)
- Faulty boost/charge pressure sensor
- Faulty wastegate bypass regulator valve (VW)
- Low fuel pressure condition (Isuzu)
- Sticking turbo nozzle control solenoid (Isuzu)
- Faulty injector control pressure (ICP) sensor (Ford)
- Low oil pressure (Ford)
- EGR system fault (Ford)
- Variable geometry turbocharger (VGT) actuator (Ford)
- VGT vanes sticking (Ford)
Troubleshooting P0299 error code
- Repair any other DTC codes if present
- Search for Technical Service Bulletins (TSBs) that may apply to your vehicle
- Perform a visual inspection of the intake air system for cracks, loose or disconnected hoses, restrictions, blockages, etc.
- Check the turbocharger wastegate regulating valve solenoid for correct operation
- Focus on diagnosing charge pressure control, diverter valve (blowoff valve), sensors, regulators, etc.
- Refer to a vehicle specific repair manual for specific troubleshooting steps
