Code Definition

U1280 — BCAN Communication Bus Line Error

System: Network Communication  |  Type: Manufacturer-Specific  |  Make: Honda

About U1280

U1280 is a manufacturer-specific network communication diagnostic trouble code recorded for Honda vehicles. 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.

U1280 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) monitors the Body CAN (BCAN) network to ensure correct communication voltage levels and data integrity between body related control units. DTC U1280 is set when the BCM detects abnormal BCAN line conditions, such as incorrect voltage levels, a dominant bus state, excessive error frames, or a bus off condition for a calibrated period, indicating a fault affecting the BCAN communication lines. This is a bus level fault rather than a single lost module, so it usually points to a wiring problem or one module corrupting the network. When this code is set multiple body ...

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