AutoCodes – Generic – U0484

U0484 Code - Invalid Data Received From Lighting Control Module Rear '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 Lighting Control Module Rear 'A', Lighting Control Module Rear 'A' harness is open or shorted, Lighting Control Module Rear '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: U0484 indicates Invalid Data Received From Lighting Control Module Rear 'A'.
Common causes: Common causes include Faulty Lighting Control Module Rear 'A', Lighting Control Module Rear 'A' harness is open or shorted, Lighting Control Module Rear '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 3,845

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 U0484 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 Lighting Control Module Rear 'A' causing its integrity to be questioned.

OBDII Code U0484 - Invalid Data Received From Lighting Control Module Rear 'A' - AutoCodes.com — U0484 Code - Invalid Data Received From Lighting Control Module Rear 'A'

What does this mean?

What are the Possible Causes of the DTC U0484?

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

How to Fix the DTC U0484?

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 U0484 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 U0484 Code

1. What does OBDII code U0484 mean?

U0484 indicates that the vehicle's computer has received invalid or corrupted data from the Rear Lighting Control Module 'A'.

2. What are the common symptoms of code U0484?

Symptoms may include malfunctioning rear lights, warning lights on the dashboard, and possible failure of additional lighting systems.

3. What causes code U0484?

The code is typically caused by wiring issues, damaged connectors, software glitches, or a faulty Rear Lighting Control Module.

4. Can code U0484 affect vehicle safety?

Yes, if the rear lights are not functioning properly, it can compromise visibility and safety, especially at night or during adverse weather conditions.

5. How can I diagnose code U0484?

Start by inspecting the wiring and connectors for damage or corrosion, then use a diagnostic scanner to check for communication errors with the Rear Lighting Control Module.

6. How do I fix code U0484?

Repairs may involve replacing damaged wiring or connectors, updating the moduleâ€™s software, or replacing the Rear Lighting Control Module if it is defective.

7. Is code U0484 specific to certain car brands?

While it may appear in various vehicles equipped with OBDII systems, its exact troubleshooting steps and affected components can vary by manufacturer.

8. Can a dead battery trigger code U0484?

Yes, a dead or weak battery can cause communication errors between modules, potentially triggering this code.

9. Do I need to reprogram the module after replacing it for code U0484?

In some cases, the new module may need to be programmed or initialized using specialized diagnostic equipment.

10. Can I drive with code U0484 active?

While the vehicle may still be drivable, malfunctioning rear lights could pose a safety hazard and lead to legal issues. Prompt repair is recommended.