Code Definition

U0259 (87) — Lost Communication With Active Lane Control (ACL) System

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

About U0259

U0259 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for LDV 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 U0259 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

This DTC sets when one or more control modules on the vehicle CAN network detect a loss of communication with the Active Lane Control, or ACL, system for longer than the calibrated timeout. The ACL module provides lane keeping and lane departure assistance, using camera and steering inputs to help hold the vehicle in its lane, and it shares status over the CAN bus. The code is logged when the expected CAN messages from the ACL module are missing, invalid, or no longer updating, which means the module is offline or cannot communicate reliably. When this fault is present the lane keeping and lan...

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