AutoCodes – Generic – U0556

U0556 Code - Invalid Data Received From Front Display Interface Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Front Display Interface Module, Front Display Interface Module harness is open or shorted, Front Display Interface Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0556 indicates Invalid Data Received From Front Display Interface Module.
Common causes: Common causes include Faulty Front Display Interface Module, Front Display Interface Module harness is open or shorted, Front Display Interface Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,880

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0556 Description

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. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Front Display Interface Module causing its integrity to be questioned.

OBDII Code U0556 - Invalid Data Received From Front Display Interface Module - AutoCodes.com — U0556 Code - Invalid Data Received From Front Display Interface Module

What does this mean?

What are the Possible Causes of the DTC U0556?

Faulty Front Display Interface Module
Front Display Interface Module harness is open or shorted
Front Display Interface Module circuit poor electrical connection

How to Fix the DTC U0556?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0556 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U0556 code?

Need more information on how to fix the U0556 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0556 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0556 Ford — Invalid Data Received From Front Display Interface Module
U0556 Lincoln — Invalid Data Received From Front Display Interface Module
U0556 Mercury — Invalid Data Received From Front Display Interface Module

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0556 Code

What does OBDII code U0556 mean?

U0556 indicates that the vehicle's control modules have received invalid data from the Front Display Interface Module, which is responsible for displaying information on the vehicle's screen or dashboard interface.

What are the common symptoms of code U0556?

Symptoms may include a non-functional or frozen display screen, incorrect or missing information on the interface, and potential loss of functionality for connected systems like navigation or entertainment.

What causes code U0556?

Common causes include software glitches, faulty wiring or connections to the Front Display Interface Module, or a malfunctioning module itself.

How can I diagnose code U0556?

Start by scanning for other related codes, inspecting the wiring and connectors for damage, and checking the operation of the Front Display Interface Module to rule out hardware or software issues.

Can a weak battery cause U0556?

Yes, a weak or failing battery can lead to voltage fluctuations that may disrupt communication between modules and cause this code to appear.

Is code U0556 serious?

While it may not directly affect vehicle performance, it can impair access to important information or controls displayed on the interface, leading to inconvenience or safety concerns.

Can I fix code U0556 myself?

If the issue is related to loose connections or a software glitch, you may be able to resolve it by inspecting wiring or performing a reset. More complex issues may require professional repair.

How do I reset the Front Display Interface Module?

Disconnect the vehicle's battery for about 15 minutes, then reconnect it. Alternatively, some vehicles may allow a software reset through the onboard diagnostics menu.

How much does it cost to fix code U0556?

Repair costs vary depending on the cause. Fixing a loose connection may cost minimal, while replacing the Front Display Interface Module could cost several hundred dollars.

Can code U0556 cause other problems?

Yes, if the module's invalid data affects communication with other systems, it could lead to issues with navigation, climate controls, or entertainment features.