U010E

Universal

Lost Communication With Reductant Control Module

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The vehicle has detected that other control systems are not receiving messages from the reductant control module. This module manages part of the emissions system that uses reductant, commonly a fluid used to help reduce exhaust emissions. The code points to a communication problem, but does not prove that the module itself has failed. The warning may have no noticeable effect at first, or the vehicle may display an emissions warning or limit engine performance.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the vehicle loses power, enters a reduced-power mode, or becomes difficult to control, pull over safely and arrange assistance. If it drives normally, avoid ignoring the warning: a communication fault may affect emissions-system operation, and the vehicle may later limit performance.

Common Symptoms

  • The check-engine or emissions warning may illuminate because the vehicle has detected a loss of communication with the reductant control module.
  • A reductant-system warning or message may appear if the vehicle cannot receive the module's status or commands.
  • Engine performance may be limited if the vehicle's emissions-control strategy responds to the communication fault.
  • There may be no noticeable symptoms if the fault is intermittent or the vehicle continues operating with limited impact.

Common Causes

  • A loose, corroded, damaged, or moisture-affected connector may interrupt communication.
  • Damaged or poorly connected network wiring may prevent messages from reaching the reductant control module.
  • A power-supply or ground problem may prevent the module from operating or communicating.
  • A fault elsewhere on the vehicle communication network may disrupt messages to or from the module.
  • The reductant control module may have an internal fault, but this should be confirmed before replacing it.

Diagnostic Steps

  1. Note any warning messages, performance changes, and conditions when they occur; this information can help distinguish an intermittent communication issue from a constant one.
  2. With the vehicle safely parked and switched off, visually check accessible reductant-system wiring and connectors for looseness, damage, corrosion, or signs of moisture. Do not disconnect components unless the vehicle-specific service information says it is safe.
  3. Check the vehicle battery and terminals for obvious looseness or corrosion, since unstable electrical supply can contribute to control-module communication problems.
  4. If a suitable scan tool is available, record codes from all modules before clearing anything. Related communication or voltage codes can help locate the cause.
  5. If wiring, power, or network testing is needed, use vehicle-specific service information or have a qualified technician perform it; do not guess at wiring connections or replace the module based only on this code.

When to Call a Professional

A technician can scan all control modules for related communication and power-supply faults, then check the reductant control module's power, grounds, connectors, and network wiring using vehicle-specific service information. Confirm whether the module communicates before considering replacement; the cause may be elsewhere on the network.

Compare component listings

Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.

Search Amazon Search eBay

Commonly Asked Questions

Does U010E prove that the reductant control module is bad?

No. It indicates lost communication, which can result from a power, ground, connector, wiring, network, or module fault. Testing is needed to identify the cause.

Can I drive with U010E?

If the vehicle drives normally, a short trip to a repair facility may be reasonable, but the fault should be diagnosed promptly. Stop safely and arrange assistance if power is limited or the vehicle becomes difficult to control.

Why might there be no symptoms?

The communication loss may be intermittent, or the vehicle may still operate while the fault is present. A warning or performance limitation can appear later depending on the vehicle's design.

Should I replace the reductant control module?

Not without diagnosis. A technician should first check related codes and confirm the module's power, ground, connectors, and network communication.

Browse Available Code Guides

Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.