Code Definition

U0199 — Lost Communication with Door Control Module

System: Network Communication  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About U0199

U0199 is a generic (obd-ii standard) network communication diagnostic trouble code. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

Because U0199 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Body Control Module (BCM) and other networked control units communicate with the Door Control Module over the CAN body network to coordinate functions such as power windows, door locks, mirrors, and courtesy lighting. DTC U0199 is set when the BCM or network master does not receive valid communication messages from the door control module for a calibrated period of time, indicating a communication interruption or a module offline condition. The door harness flexes every time the door opens and closes, so the bus wiring at the hinge is a common failure point. When this code is set the affec...

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