Code Definition

U2105 — No Communication With Engine Control Module (ECM)

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

About U2105

U2105 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 U2105 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 U2105 is a manufacturer specific network code set when one or more networked modules receive no valid CAN messages from the Engine Control Module within a calibrated timeout while the ignition is in run or start. The receiving module monitors expected ECM traffic and logs this fault when communication is completely absent, indicating a total loss of communication rather than invalid or corrupted data. Because the ECM is central to engine operation and shares its data widely, this fault often accompanies a no start or stall condition and a cluster of related lost communication codes in othe...

Join TaT to view the complete code information and diagnostic details.

Quick Facts