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Home / DTC / U010E — Lost Communication With Reductant Control Module

U010E — Lost Communication With Reductant Control Module

Detailed page for trouble code U010E.

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22,461specific
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Code

U010E

Generic U — Network/User

Lost Communication With Reductant Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 23 EN: 48 RU: 28
AI status
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Page language: EN

Causes

  • Reductant control module failure (internal electronics/software crash)
  • Faulty or corroded connector at the reductant control module
  • Open/short in module power or ground circuits (blown fuse, bad ground, wiring damage)
  • Fault or short in the vehicle communication bus (CAN high/low shorted, open, or high resistance)
  • Intermittent wiring harness damage (pinched, chafed, water intrusion)
  • Vehicle battery/charging system voltage too low or unstable

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lamp illuminated
  • Diagnostic scanner cannot communicate with reductant control module
  • Reduced-emissions or SCR system warnings (DEF system messages)
  • Possible reduced engine power or limp mode depending on vehicle strategy
  • DEF pump/heater or dosing injector not operating
  • Regeneration inhibited or fault in aftertreatment system

What to check

  • Scan vehicle for U010E and any other U- or P-codes; note freeze-frame and events
  • Verify battery voltage is within 12.0–14.5 V with engine off and cranking
  • Visually inspect reductant module connector and harness for damage, corrosion, or water
  • Check fuses/relays supplying the reductant control module
  • Attempt to communicate with the reductant module using a capable scan tool
  • Inspect CAN bus wiring and connectors for damage; check for recent repairs or aftermarket installs

Signal parameters

  • No CAN messages from reductant module ID(s) detected on the bus (module absent)
  • CAN bus idle voltages: CAN_H and CAN_L ~2.5 V each (typical); dominant bits ~CAN_H ~3.5 V and CAN_L ~1.5 V — verify with scope
  • Battery supply to module: ~12–14.5 V when key on; no large voltage drops during cranking
  • Ground continuity from module housing/ground pin to chassis ground should be near 0 Ω
  • Module should present periodic heartbeat/telemetry on the bus (interval depends on vehicle; absence indicates comms fault)

Diagnostic algorithm

  1. Record all active and stored codes and freeze frame data. Note if code is current or intermittent.
  2. Verify battery state and charging system. Low voltage can cause modules to disappear from the network.
  3. Using a scan tool, attempt to connect to the reductant control module. If no response, try listing network nodes to verify which modules are present.
  4. Visually inspect the reductant module connector and harness for corrosion, bent pins, or water ingress. Repair as needed before further testing.
  5. Check fuses/relays that feed the reductant control module for continuity and proper operation. Replace any blown fuses.
  6. Measure module power and ground at the connector: verify 12 V (key on) and good ground continuity. Repair power/ground faults.
  7. Probe CAN_H and CAN_L at the module connector with a multimeter or scope: verify idle voltages and that the differential changes with network traffic. If bus levels abnormal, trace wiring to locate opens/shorts.
  8. If the bus looks healthy but module does not respond, perform an intermittent/wiggle test on harness while monitoring communication to reproduce failure.
  9. Check for other modules reporting communication errors or bus flooding; isolate the problematic branch by disconnecting suspected nodes one at a time (follow manufacturer isolation procedures).
  10. If wiring, fuses, and bus are good and the module still does not communicate, the reductant control module may be faulty — consult OEM service info for replacement and programming requirements. Program/flash new module as required.
  11. After repairs, clear codes and confirm normal communication and system operation. Road test and re-scan to verify code does not return.

Likely causes

  • CAN bus wiring to reductant module open, shorted or high resistance
  • Blown fuse or relay supplying 12 V to the reductant module
  • Poor battery/ground condition causing module to drop off the bus
  • Connector corrosion/water intrusion at module or junctions
  • Defective reductant control module (no CAN transmit/receive)

Fault status

⚠️ Status
Lost Communication With Reductant Control Module — the vehicle network has not received messages from the reductant control module. Check module power/ground, connectors, and CAN bus for faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0101 U0140 U0073 P0600
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