Engine-Codes - Generic - U0256

U0256 - Lost Communication With Front Controls Interface Module 'A'

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

U0256 Possible Causes

  • Faulty Front Controls Interface Module 'A'
  • Front Controls Interface Module 'A' harness is open or shorted
  • Front Controls Interface Module 'A' circuit poor electrical connection

How is the U0256 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 code

Labor: 1.0

The cost to diagnose the U0256 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 Meaning

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Front Controls Interface Module 'A' has not been received.

More Information

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Information for specific makes

  • U0256 BUICK Lost Communication With Infotainment Faceplate Control Module
  • U0256 CADILLAC Lost Communication With Infotainment Faceplate Control Module
  • U0256 CHEVROLET Lost Communication With Infotainment Faceplate Control Module
  • U0256 FORD Lost Communication With Front Controls Interface Module 'A'
  • U0256 GMC Lost Communication With Infotainment Faceplate Control Module
  • U0256 LINCOLN Lost Communication With Front Controls Interface Module 'A'
  • U0256 MERCURY Lost Communication With Front Controls Interface Module 'A'

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