P0234Nissan AltimaYears: 1996 - 2026
Engine Over Boost Condition
Reviewed by ASE Certified Technician
What does this mean?
Code P0234 indicates the turbocharger or supercharger is producing more boost pressure than specified by the PCM. Excessive boost can cause serious engine damage.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Nissan Altima 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.
Advertisement (In-Article)
Common Causes
Stuck or faulty turbo wastegate
Faulty turbocharger boost control actuator
Vacuum leak in intake system
PCM/ECM software needs update (TSB)
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
- Engine knocking or detonation noise