Engine-Codes - Cadillac - U0256 CADILLAC

U0256 CADILLAC - Lost Communication With Infotainment Faceplate Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U0256 CADILLAC Possible Causes

  • Faulty Infotainment Faceplate Control Module
  • Infotainment Faceplate Control Module harness is open or shorted
  • Infotainment Faceplate Control Module circuit poor electrical connection

How is the U0256 CADILLAC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the U0256 CADILLAC code

Labor: 1.0

The cost to diagnose the U0256 CADILLAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U0256 CADILLAC Meaning

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Infotainment Faceplate Control Module has not been received.

More Information

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