Code Definition

U2257 (60) — Invalid Serial Data Received

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

About U2257

U2257 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for Ford 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.

Because U2257 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

DTC U2257 is a manufacturer specific network code set when a control module receives serial data over the CAN bus that is present but invalid, corrupted, incorrectly formatted, or outside expected parameters. The receiving module validates incoming messages for structure, timing, and plausibility, and logs this fault when serial data fails those checks, indicating a data integrity problem rather than a complete loss of communication. Because the code does not name a specific source module, it commonly reflects a bus wiring or integrity fault, an unstable supply at a transmitting module, or net...

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