AutoCodes – Generic – U024A

U024A Code - Lost Communication With Interior Lighting Control 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 Interior Lighting Control Module, Interior Lighting Control Module harness is open or shorted, Interior Lighting Control 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: U024A indicates Lost Communication With Interior Lighting Control Module.
Common causes: Common causes include Faulty Interior Lighting Control Module, Interior Lighting Control Module harness is open or shorted, Interior Lighting Control 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 2,136

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U024A 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. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Interior Lighting Control Module has not been received.

OBDII Code U024A - Lost Communication With Interior Lighting Control Module - AutoCodes.com — U024A Code - Lost Communication With Interior Lighting Control Module

What does this mean?

What are the Possible Causes of the DTC U024A?

Faulty Interior Lighting Control Module
Interior Lighting Control Module harness is open or shorted
Interior Lighting Control Module circuit poor electrical connection

How to Fix the DTC U024A?

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 U024A 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 U024A Code

1. What does the OBDII code U024A mean?

The U024A code indicates a loss of communication between the vehicle's main control modules and the Interior Lighting Control Module.

2. What are common symptoms of the U024A code?

Symptoms may include non-functional interior lights, dimly lit or flickering lights, and possible malfunction warnings on the dashboard.

3. What causes the U024A code to appear?

Common causes include a faulty Interior Lighting Control Module, loose or damaged wiring, corroded connectors, or issues with the vehicle's CAN bus communication network.

4. Can a blown fuse cause the U024A code?

Yes, a blown fuse related to the Interior Lighting Control Module can interrupt communication and trigger this code.

5. How do I diagnose the U024A code?

Start by inspecting the wiring and connectors for damage or corrosion, check the relevant fuses, and use a scan tool to confirm communication with the Interior Lighting Control Module.

6. Can I drive my car with the U024A code active?

Yes, you can usually drive the car, but interior lighting features may not work, and the code could indicate a broader communication issue that needs attention.

7. How do I fix the U024A code?

Repairs may include replacing damaged wiring, cleaning or reconnecting corroded connectors, replacing a faulty Interior Lighting Control Module, or updating the vehicle's software.

8. Will disconnecting the battery clear the U024A code?

Disconnecting the battery may reset the system temporarily, but the code will return if the underlying issue is not resolved.

9. Is the U024A code specific to certain car brands or models?

No, the U024A code is a generic OBDII code, but its exact symptoms and troubleshooting steps may vary depending on the vehicle manufacturer.

10. Do I need a professional mechanic to fix the U024A code?

While some basic checks like inspecting fuses and connectors can be done at home, diagnosing and repairing communication issues often requires professional tools and expertise.