U010E: Lost Communication With Reductant Control Module

U010E is a network communication fault that appears when the main control network loses contact with the reductant control module, which manages your vehicle's exhaust fluid injection system. The code is stored on the communication bus and typically indicates that one module is failing to send or receive data as expected. It does not necessarily mean the reductant system itself has failed, only that communication with it has been interrupted.

The most common causes are a loose or corroded connector at the reductant control module, a damaged section of wiring in the CAN bus circuit, or a module that has developed a fault and stopped transmitting. A blown fuse supplying the module can also trigger this code. Start by checking the relevant fuse, then inspect the wiring harness and connectors serving the reductant module for any signs of damage, moisture ingress, or pin corrosion.

Because U010E is classified as low severity, it is unlikely to cause an immediate breakdown or require you to pull over. That said, leaving communication faults unresolved can mask other codes and may eventually affect how the reductant system operates, which has implications for emissions compliance. Get the wiring and connectors checked at your next convenient service appointment and clear the code to confirm whether it returns.