Reductant Temperature Too Low
The reductant temperature is below the calibrated minimum. DEF/AdBlue may not flow correctly through the dosing system - heater fault or extreme cold weather.
Affected components
- Reductant tank
- Reductant heater
- Reductant lines
Common causes
- High likelihood: Reductant heater failed
- Medium likelihood: Extreme ambient cold
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
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.