OBD-II code · Network
U061C Lost Communication With Reductant Temperature Sensor A
The vehicle bus reports loss of communication with smart reductant (DEF/AdBlue) temperature sensor A. Heater control and freeze protection lose their primary feedback.
Is it safe to drive with U061C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Reductant Temp Sensor A, Vehicle Bus Wiring
Related codes
- U061DLost Communication With Reductant Temperature Sensor B
- U0619Lost Communication With Reductant Level Sensor A
- U061ALost Communication With Reductant Level Sensor B
- U061BLost Communication With Reductant Level Sensor C
- U061ELost Communication With Battery Isolation/Voltage Stabilization Control Module
- U061FLost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.