P0299Gmc Hummer-evYears: 1996 - 2026
Engine Over Boost Condition (Turbo/Supercharger)
Reviewed by ASE Certified Technician
What does this mean?
Code P0299 indicates under-boost condition from the turbocharger/supercharger.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Gmc Hummer-ev models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Stuck or faulty turbo wastegate
Faulty turbocharger boost control actuator
Vacuum leak in intake system
Exhaust leak before oxygen sensor
Symptoms to Watch For
- Check Engine Light is illuminated
- Excessive turbo lag or no boost
- Significant loss of engine power
- Vehicle enters reduced power / limp mode