What does code U04BB mean?

Q: What does code U04BB mean?

Invalid Data Received From Switch Input Module B. U04BB is a communication fault where the vehicle's network master or a control module receives invalid or missing data from the Switch Input Module B, which is the module that reads inputs from a group of switches such as steering wheel buttons, console buttons, or door switches. The computer detects that the data frames from this module are corrupt, out of range, or not arriving as expected, so it flags the module as sending invalid data.

DTC codes / U04xx · Invalid data received from a module / U04BB

U04BBInvalid Data Received From Switch Input Module B

U04BB is a communication fault where the vehicle's network master or a control module receives invalid or missing data from the Switch Input Module B, which is the module that reads inputs from a group of switches such as steering wheel buttons, console buttons, or door switches. The computer detects that the data frames from this module are corrupt, out of range, or not arriving as expected, so it flags the module as sending invalid data.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

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.