What does code U0554 mean?

DTC codes / U05xx · Network communication / U0554

U0554Invalid Data Received From Accessory Protocol Interface Module

U0554 means the module that coordinates communication between the vehicle's main network and its accessory systems, such as the radio, climate control, or infotainment head unit, has sent data the rest of the car cannot interpret. The computer detected a message from the Accessory Protocol Interface Module (APIM) that was missing expected values, out of range, or otherwise invalid for the current operating state.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

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