U061CLost Communication With Reductant Temperature Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Reductant temperature sensor A tells the controller how warm the diesel exhaust fluid is. That value decides when tank and line heaters must run, when dosing may begin after a cold start, and the concentration reading relies on it, since it is calculated from how fast sound travels through the fluid. On digital units the temperature element shares a housing with the level or quality measurement; SSI's ultrasonic tank sensor, for example, sends temperature, level and concentration together over J1939. U061C is logged when frames that carry temperature A no longer arrive or fail their checks. No manufacturer publicly documents a threshold or delay for this code. The analog circuit faults of the sensor are P2042 to P2046. In winter, a missing temperature can hold off SCR dosing for longer, so NOx emissions rise.
- What you may notice
- Check engine light
- DEF heater or SCR dosing starts late or not at all in cold weather
- DEF quality reading unavailable
- Likely causes
- LikelyConnector of the combined DEF tank sensor corroded or loose
- PossibleDamaged data, supply or ground wire to the sensor
- PossibleSensor electronics failed, sometimes after freeze damage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.