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Home / DTC / U061A — Lost Communication With Reductant Level Sensor B

U061A — Lost Communication With Reductant Level Sensor B

Detailed page for trouble code U061A.

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Code

U061A

Generic U — Network/User

Lost Communication With Reductant Level Sensor B

Brand: Generic
Type: U — Network/User
Views: UK: 22 EN: 24 RU: 23
AI status
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Page language: EN

Causes

  • Open, shorted, or corroded wiring or connector at reductant level sensor B
  • Poor or missing sensor power or ground
  • Faulty reductant level sensor (internal electronics or float)
  • CAN/serial network fault (short, high resistance, missing termination)
  • Faulty PCM/ECM/aftertreatment control module or module software fault
  • Blown fuse or relay feeding the sensor or communication module

Symptoms

  • Malfunction Indicator Lamp (MIL) or check-engine light on
  • Reduced or incorrect reductant/DEF level reading on dash (may read empty or fixed value)
  • Aftertreatment system warnings or reduced performance of NOx control strategies
  • Inability to complete regen cycles or vehicle may enter limp/reduced-power mode on some systems
  • Stored U061A and possibly related communications codes

What to check

  • Retrieve freeze frame and all related codes with a capable scan tool; note module reporting U061A
  • Visual inspection of sensor B connector and wiring for corrosion, damage, pin push-out, or fluid intrusion
  • Verify vehicle battery voltage and charging system are within spec
  • Check fuses/relays powering sensor and related control modules
  • Backprobe sensor connector to verify presence of expected power and ground
  • Check CAN/serial bus continuity and termination resistance (typical CAN ~60 ohm across bus)

Signal parameters

  • Sensor supply voltage: typically battery (12V) or regulated 5V reference — verify against vehicle spec
  • Signal output: often an analog voltage or resistance corresponding to level (0–5 V typical) or a periodic CAN/serial message
  • Expected idle CAN message frequency for sensor/module: often 1 Hz or higher — consult vehicle documentation
  • Normal resistance or voltage range will be vehicle-specific; open circuit or out-of-range values indicate fault
  • CAN bus termination: ~60 ohms measured end-to-end across CAN high/low

Diagnostic algorithm

  1. Confirm the code: read U061A and any related codes from all modules; record freeze-frame data and symptoms.
  2. Clear codes and see if U061A returns immediately or only under certain conditions (helps identify intermittent faults).
  3. Visually inspect sensor B connector and wiring harness for damage, corrosion, fluid intrusion, or pin deformation; repair as needed.
  4. Verify power and ground at the sensor connector with a DVOM. If no power/ground, trace and repair upstream wiring, fuses, or relays.
  5. Backprobe signal/communication pin while operating (or while fluid level changes if safe) and observe voltage or message presence with scan tool or oscilloscope.
  6. Test wire continuity and resistance between sensor connector and the receiving control module; repair any opens/shorts.
  7. Check CAN/serial bus integrity: measure bus voltages, termination resistance, and scan for bus errors. Repair damaged segments or poor splices.
  8. If wiring and bus are good, swap sensor B with sensor A (if identical and practical) to confirm whether the sensor itself is faulty.
  9. If replacement sensor cures the issue, reinstall and retest. If swapping moves the fault with the sensor, replace the failed sensor.
  10. If fault persists after sensor and wiring verification, inspect or reflash the affected control module software or replace the module per manufacturer procedures.
  11. After repairs, clear codes and perform a test drive/regeneration cycle to confirm no recurrence and that reductant level reporting is normal.

Likely causes

  • Connector corrosion or water intrusion at sensor B (common on in-tank or near-tank sensors)
  • Broken signal or ground wire between sensor B and controller (opens are common)
  • Failed sensor B (float or internal electronics failed)
  • CAN bus fault affecting messages from sensor module (loose splices, short to battery)
  • Intermittent module power/ground or weak battery causing communication dropout

Fault status

⚠️ Status
Lost Communication With Reductant Level Sensor B — no valid signal or CAN message received from sensor B. Fault set when the control module cannot read the sensor or receives invalid/out-of-range data.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0073 U0121 U0155 U0415
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