What does code U0499 mean?

Q: What does code U0499 mean?

Invalid Data Received From Telematic Control Module. U0499 is a communication fault indicating that a control module received invalid or corrupted data from the Telematic Control Module (TCM), which is the factory-installed telematics unit responsible for emergency calling, remote diagnostics, and vehicle tracking. The receiving module detected that the data frames from the TCM did not match the expected format or contained out-of-range values, so it flagged the signal as invalid rather than missing.

DTC codes / U04xx · Invalid data received from a module / U0499

U0499Invalid Data Received From Telematic Control Module

U0499 is a communication fault indicating that a control module received invalid or corrupted data from the Telematic Control Module (TCM), which is the factory-installed telematics unit responsible for emergency calling, remote diagnostics, and vehicle tracking. The receiving module detected that the data frames from the TCM did not match the expected format or contained out-of-range values, so it flagged the signal as invalid rather than missing.

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.