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Home / DTC / U061C — Lost Communication With Reductant Temperature Sensor A

U061C — Lost Communication With Reductant Temperature Sensor A

Detailed page for trouble code U061C.

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Code

U061C

Generic U — Network/User

Lost Communication With Reductant Temperature Sensor A

Brand: Generic
Type: U — Network/User
Views: UK: 29 EN: 18 RU: 17
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Page language: EN

Causes

  • Open, short or intermittent wiring between sensor A and control module
  • Corroded, loose, or damaged connector at sensor or module
  • Failed reductant (DEF/urea) temperature sensor
  • Failed SCR/reductant control module or ECM/PCM input circuit
  • CAN/data bus or local communications fault (noise, missing termination)
  • Blown fuse or damaged power/ground supplying the sensor or module

Symptoms

  • MIL (check engine) or DEF system warning illuminated
  • Messages about reductant/DEF system fault or reduced emissions control performance
  • Reduced engine performance or derate in some vehicles (if emissions strategy limits operation)
  • Inhibited or failed SCR regen or dosing events
  • Stored U061C and possibly related communication DTCs

What to check

  • Retrieve all stored DTCs and freeze-frame data with a capable scan tool; note time/conditions
  • Visually inspect sensor harness, connector and nearby components for damage, corrosion, contamination or repairs
  • Check for other communication codes (other U-codes) that indicate bus-wide issues
  • Backprobe connector at sensor and at module while monitoring live data with scan tool (if available)
  • Check fuses/relays supplying SCR/reductant module circuits
  • Wiggle test harness while monitoring data to reproduce intermittent loss

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance varies with temperature)
  • At ambient (~20–25°C) expect a mid-range thermistor resistance (manufacturer-specific; commonly ~1k–10kΩ) — resistance decreases as temperature rises
  • Signal path: sensor resistance/voltage to SCR control module or ECM (not a dedicated CAN message in some designs)
  • If sensor is networked, communication occurs over vehicle CAN/FD bus — check CAN voltages ~2.5V idle on each line and differential waveform for activity

Diagnostic algorithm

  1. Confirm code and check for related U-codes: record freeze frame and any simultaneous faults.
  2. Perform a visual inspection of the sensor, connector and harness for corrosion, contamination, heat damage or disconnection. Repair visible damage.
  3. With ignition on, check for proper power and ground at the sensor connector (compare to vehicle wiring diagram). Repair open circuits or poor grounds.
  4. Measure sensor resistance at ambient and while warming the sensor (remove sensor if needed). Compare to manufacturer specs; look for open/short (infinite/zero resistance).
  5. If resistance behavior is correct, backprobe connector and monitor live temperature data with scan tool while wiggling harness to find intermittent faults.
  6. If the system uses CAN for the sensor, check CAN bus health with a scan tool or scope: verify proper voltages, termination and activity; repair any bus faults.
  7. Replace sensor if wiring, power and CAN communications are good and sensor is out of expected range or shows open/short.
  8. If replacement sensor does not clear the code, test/inspect the SCR/reductant control module input circuit and related connectors; consider module replacement or manufacturer-level diagnostics.
  9. After repairs, clear codes and perform a road/operation cycle to confirm the fault does not return.

Likely causes

  • Connector disconnected or corroded at reductant temperature sensor
  • Broken or chafed harness where it is routed through chassis or near hot components
  • Sensor internal failure (thermistor open/short)
  • Faulty SCR control module or engine control module communication port
  • Intermittent CAN bus wiring fault or module in sleep/off state

Fault status

⚠️ Status
Control module detected no response or invalid data from Reductant Temperature Sensor A circuit. Communication loss stored as U061C. Emissions/DEF system operation may be affected; further diagnostics required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0073 U0422 U0415
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