U061D code meaning
Lost Communication With Reductant Temperature Sensor B
Network system Generic code U06xx codes Check engine light
What U061D means
Temperature sensor B is a second temperature input of the reductant system. Where it sits depends on the maker: at another spot in the tank unit, in the pump or supply module, or along the dosing line. Volvo's truck tank sensor, for instance, measures temperature at two points on its circuit board, yet sends everything over one CAN connection and reports a lost connection as U02A2 rather than with this code. U061D therefore belongs to designs in which temperature B arrives as its own digital message. If only B drops out, the controller can usually keep working with A but loses the cross-check between the two values and the heater control for that zone. No manufacturer publicly documents U061D. Circuit faults of an analog sensor B are P2ACC to P2AD0.
U061D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U061D
- Malfunction indicator lamp
- Line or pump heating may not work properly in frost
Common causes of U061D
- Most likelyWiring to the second temperature point (pump module or dosing line) damaged
- PossibleConnector of temperature sensor B corroded or not latched
- PossibleTemperature sensor B or the module housing it failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant temp sensor bSensor wiring
What each part of U061D means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1D | The exact fault in that area. |
What to do next
- Note U061D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U061D
What does U061D mean?
U061D means "Lost Communication With Reductant Temperature Sensor B". Temperature sensor B is a second temperature input of the reductant system. It is a generic code, so it means the same on every make.
Is it safe to drive with U061D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U061D fail an emissions test?
Yes, it can. U061D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U061D to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U061D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.