Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 2
The reductant injection valve on bank 1 unit 2 reports a range/performance fault. Dosing accuracy on this unit is impaired.
Affected components
- Reductant injection valve b1 u2
Common causes
- High likelihood: Injection valve partially clogged
- Medium likelihood: Coil resistance drifted
- Low likelihood: Sensor element aged beyond calibration window
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
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
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.