Excessive Time To Enter Closed Loop Reductant Injection Control
After cold start the AdBlue injection runs open-loop until SCR temperature is reached. The transition into closed-loop is taking longer than calibrated.
Affected components
- Scr catalyst
- Reductant injection control
Common causes
- High likelihood: SCR warm-up slow
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
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.