Reductant Injection Air Pressure Control Valve Performance
Reductant air-pressure control valve is electrically OK but cannot hold or modulate pressure within calibration — partial blockage or weak solenoid.
Affected components
- Reductant air pressure control valve
Common causes
- High likelihood: Partial blockage
Possible symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.