Reductant Temperature Sensor B Range/Performance
The reductant temperature B signal does not match plausibility checks against related signals. Sensor drift.
Affected components
- Reductant temperature sensor b
- Wiring harness
- Ecm
Common causes
- High likelihood: Sensor characteristic drifted
- Medium likelihood: Sensor mounting displaced from reference path
- 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
- 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.