Code Definition

U2516 — CAN Communication Error

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

About U2516

U2516 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 U2516 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 U2516 sets when a control module detects a loss of communication with another module over the high speed CAN bus for a calibrated period. Modules on the network expect valid CAN messages at regular intervals, and when those messages are missing, corrupted, or implausible, the module decides that communication has failed and logs this code. It is typically associated with poor CAN signal integrity, wiring, or a module dropping off the bus rather than an internal software error. Because many functions share the CAN network, the driver may see several warning lights and features misbehaving a...

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