Reductant Heater Control Module Supply Voltage
The reductant (AdBlue) heater control module - which warms tank, lines and injector to keep AdBlue from freezing - reports its supply voltage outside the calibrated window.
Affected components
- Reductant heater control module
Common causes
- High likelihood: Supply voltage low
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.