AutoCodes – Generic – U049A

U049A 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 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 4,042

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

What does this mean?

What are the Possible Causes of the DTC U049A?

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?

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 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 U049A code?

Need more information on how to fix the U049A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U049A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U049A Ford — Invalid Data Received From Door Control Module 'A'
U049A Lincoln — Invalid Data Received From Door Control Module 'A'
U049A Mercury — Invalid Data Received From Door Control Module 'A'

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 Code

1. What does the OBDII code U049A mean?

U049A indicates that invalid data has been received from Door Control Module 'A,' suggesting a communication issue between the module and the vehicle’s control systems.

2. What are the symptoms of code U049A?

Common symptoms include malfunctioning door locks, unresponsive power windows, inoperative mirrors, or warning lights on the dashboard.

3. What causes the U049A code?

The code can be caused by a faulty Door Control Module, wiring or connector issues, software glitches, or interference in the communication network.

4. Can I drive my car with the U049A code?

While the vehicle may still be drivable, the affected door functions (e.g., locks or windows) may not work properly, which could pose a safety or convenience concern.

5. How do I diagnose the U049A code?

Start by inspecting the wiring and connectors to the Door Control Module. Use a scan tool to check for additional codes and monitor communication signals.

6. How can I fix the U049A code?

Repairs may involve replacing or reprogramming the Door Control Module, repairing damaged wiring, or clearing the code after fixing the issue.

7. Does the U049A code always require module replacement?

Not necessarily. Many instances can be resolved by addressing loose connections, damaged wiring, or software updates.

8. What tools are needed to fix the U049A code?

A diagnostic scan tool, a multimeter for checking wiring, and potentially programming equipment for reprogramming the module.

9. How much does it cost to repair code U049A?

Repair costs vary, but they may range from $100 for a simple wiring fix to $500 or more if the module needs replacement or reprogramming.

10. Can a dead battery trigger the U049A code?

A weak or dead battery can sometimes cause communication errors like U049A, so ensure the battery is fully charged before further diagnosis.

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