AutoCodes – Mercury – U0284 Mercury

U0284 Mercury Code - Lost Communication With Lost Communication With Active Grille Air Shutter Module 'A'

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the Local Interconnect Network (LIN) communication line for messages from the Active Grille Air Shutter Module 'A'. Common causes include Faulty Active Grille Air Shutter Module 'A', Active Grille Air Shutter Module 'A' harness is open or shorted, Active Grille Air Shutter Module 'A' 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: U0284 Mercury indicates Lost Communication With Lost Communication With Active Grille Air Shutter Module 'A'.
Common causes: Common causes include Faulty Active Grille Air Shutter Module 'A', Active Grille Air Shutter Module 'A' harness is open or shorted, Active Grille Air Shutter Module 'A' 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 672

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 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0284 Mercury Description

The Powertrain Control Module (PCM) continuously monitors the Local Interconnect Network (LIN) communication line for messages from the Active Grille Air Shutter Module 'A'. This Diagnostic Trouble Code (DTC) sets when the PCM does not receive the Active Grille Air Shutter Module 'A' message within the defined amount of time.

OBDII Code U0284 Mercury - Lost Communication With Lost Communication With Active Grille Air Shutter Module 'A' - AutoCodes.com — U0284 Mercury Code - Lost Communication With Lost Communication With Active Grille Air Shutter Module 'A'

What does this mean?

What are the Possible Causes of the DTC U0284 Mercury?

Faulty Active Grille Air Shutter Module 'A'
Active Grille Air Shutter Module 'A' harness is open or shorted
Active Grille Air Shutter Module 'A' circuit poor electrical connection

How to Fix the DTC U0284 Mercury?

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 U0284 Mercury 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 U0284 Mercury code?

Need more information on how to fix the U0284 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 U0284 Mercury Code

What does the OBDII code U0284 mean for a Mercury vehicle?

The U0284 code indicates that the vehicle's Active Grille Air Shutter Module 'A' is not communicating with the powertrain control module (PCM).

What are the common symptoms of the U0284 code in a Mercury?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, or noticeable grille shutter malfunction (e.g., stuck open or closed).

What causes the U0284 code to appear?

Common causes include faulty wiring or connectors, a malfunctioning Active Grille Air Shutter Module 'A,' or a failed PCM.

Can I drive my Mercury with the U0284 code active?

While the vehicle may still be drivable, ignoring the code can lead to reduced fuel efficiency or potential damage to the engine due to improper airflow management.

How do I diagnose the U0284 code in my Mercury?

Start by inspecting the grille shutter wiring and connectors for damage or corrosion. Use a scan tool to check for communication between the module and PCM.

What tools are needed to troubleshoot the U0284 code?

A diagnostic scan tool, a multimeter for testing voltage and continuity, and basic hand tools for inspecting and repairing wiring connections.

How do I fix the U0284 code on a Mercury?

Repairs may involve fixing or replacing damaged wiring or connectors, reprogramming or updating the PCM, or replacing the Active Grille Air Shutter Module 'A.'

What is the role of the Active Grille Air Shutter Module 'A'?

The module controls the opening and closing of grille shutters to optimize engine temperature and improve fuel efficiency.

Can a dead battery cause the U0284 code to appear?

Yes, a weak or dead battery can disrupt communication between the module and PCM, potentially triggering the U0284 code.

How much does it cost to repair the U0284 code on a Mercury?

Repair costs can range from $100 to $500 depending on whether the issue is with wiring, the module, or the PCM. Labor and diagnostic fees may also affect the total cost.