What does code U049E mean?

DTC codes / U04xx · Invalid data received from a module / U049E

U049EInvalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor

This code means the engine control module (ECM) received a data message from the direct ozone reduction (DOR) catalyst temperature sensor that it considers invalid or out of range. The ECM is not reporting a simple open or short circuit; it is flagging that the sensor's digital communication is corrupted, missing expected values, or arriving in a format the module cannot trust.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaInvalid data received from a module

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.