Code Definition

U1401 — Invalid Data Received From Engine Control Module (ECM)

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

About U1401

U1401 is a manufacturer-specific 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.

U1401 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, Transmission Control Module, ABS, and other networked modules exchange engine operating data with the Engine Control Module over the CAN bus. DTC U1401 is a manufacturer specific code set when a receiving module detects that a valid CAN message from the ECM is present but the data content is invalid, implausible, incorrectly formatted, or outside the expected operating range. This points to a data integrity or ECM processing issue rather than a complete loss of communication. Common origins include an unstable ECM supply, corrupt or mismatched ECM software, a bad engin...

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