Reductant Control Module Performance
The dedicated SCR/reductant control module reports an internal performance fault — failed self-tests, watchdog resets, or calibration mismatch. Frequently a forerunner of total module failure.
Affected components
- Scr control module
Common causes
- High likelihood: Internal module fault
- Medium likelihood: Calibration mismatch after software update
- Low likelihood: Module software outdated, reflash may resolve
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.