Code Definition

U0200 — Lost Communication With Door Control Module B

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

About U0200

U0200 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 U0200 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 control modules on the vehicle communicate over the Controller Area Network (CAN) data bus to share operational and status information. DTC U0200 sets when one or more modules detect a loss of serial data communication with Door Control Module B for a calibrated period, meaning the expected CAN messages from that module are no longer received. This usually indicates the door control module is offline, unpowered, or unable to transmit on the network, rather than a fault inside the door functions themselves. The specific door that Module B controls varies by manufacturer, but it commonly ref...

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