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U061D Lost Communication With Reductant Temperature Sensor B

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

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.

Likely causes

Wiring to the second temperature point (pump module or dosing line) damaged

Connector of temperature sensor B corroded or not latched

Temperature sensor B or the module housing it failed

Symptoms

Malfunction indicator lamp
Line or pump heating may not work properly in frost

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€80–1,000

Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant temp sensor bsensor wiring

References: static.nhtsa.gov, law.cornell.edu.