Code Definition

U0253 (00-08) — Missing Communication With Accessory Protocol Interface Module

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

About U0253

U0253 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 U0253 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

The vehicle control modules communicate over the Controller Area Network (CAN) to exchange system and accessory control data. DTC U0253 sets when the expected CAN messages from the Accessory Protocol Interface Module are not received within a calibrated time period. A failure type byte of 00 with an 08 qualifier indicates a general loss of communication where the message is missing. This occurs when the module is offline due to loss of power or ground, a CAN circuit fault, or an internal module failure. The accessory protocol interface module is the heart of the connectivity and infotainment i...

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