AutoCodes – Mercury – U049A Mercury

U049A Mercury Code - Invalid Data Received From Door Control Module 'A'

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 Door Control Module 'A', Door Control Module 'A' harness is open or shorted, Door Control 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: U049A Mercury indicates Invalid Data Received From Door Control Module 'A'.
Common causes: Common causes include Faulty Door Control Module 'A', Door Control Module 'A' harness is open or shorted, Door Control 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 560

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 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U049A Mercury 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 Door Control Module 'A' causing its integrity to be questioned.

OBDII Code U049A Mercury - Invalid Data Received From Door Control Module 'A' - AutoCodes.com — U049A Mercury Code - Invalid Data Received From Door Control Module 'A'

What does this mean?

What are the Possible Causes of the DTC U049A Mercury?

Faulty Door Control Module 'A'
Door Control Module 'A' harness is open or shorted
Door Control Module 'A' circuit poor electrical connection

How to Fix the DTC U049A 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 U049A 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.

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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 U049A Mercury Code

1. What are the common symptoms of the OBDII code U049A in a Mercury related to the Door Control Module 'A'?

The common symptoms include issues with power door locks, malfunctioning windows, interior lights not working properly, and warning lights on the dashboard.

2. What are the possible causes of the U049A code indicating Invalid Data Received From Door Control Module 'A' in a Mercury?

Possible causes include a faulty door control module, damaged wiring or connectors, a software glitch, or issues with the vehicle's communication network.

3. How can I diagnose the U049A code in my Mercury related to the Door Control Module 'A'?

Diagnosis involves using an OBDII scanner to retrieve the specific code, inspecting the door control module and related wiring for any visible damage, and testing the communication network for any faults.

4. Is it safe to drive my Mercury with the U049A code indicating Invalid Data Received From Door Control Module 'A'?

It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of important systems like door locks and windows, potentially compromising safety.

5. What are some repair tips for fixing the U049A code in a Mercury with issues related to the Door Control Module 'A'?

Repair tips include checking and repairing any damaged wiring or connectors, resetting the door control module, updating software if necessary, and ensuring proper communication between modules.

6. Can I reset the U049A code in my Mercury without fixing the underlying issue related to the Door Control Module 'A'?

While you can clear the code with an OBDII scanner, it is crucial to address the underlying problem to prevent the code from reoccurring and to ensure the proper functioning of the affected systems.

7. How much does it typically cost to repair the U049A code in a Mercury linked to the Door Control Module 'A'?

The cost of repair can vary depending on the exact cause of the issue, but it may involve anywhere from a simple fix like reconnecting loose wiring to more complex repairs requiring module replacement.

8. Can a DIY enthusiast fix the U049A code related to the Door Control Module 'A' in a Mercury?

Depending on the level of expertise and access to tools, some DIY enthusiasts may be able to address simpler causes like loose connections. However, complex issues may require professional diagnosis and repair.

9. Are there any recalls or technical service bulletins related to the U049A code in Mercury vehicles with problems in the Door Control Module 'A'?

It is advisable to check with the manufacturer or a reputable automotive service center to determine if there are any recalls or technical service bulletins addressing this specific code in Mercury vehicles.

10. How can regular maintenance help prevent issues like the U049A code related to the Door Control Module 'A' in my Mercury?

Regular maintenance, including checking and cleaning electrical connections, inspecting wiring for wear and tear, and keeping software up to date, can help prevent issues with modules like the Door Control Module 'A'.