AutoCodes – Infiniti – U121A Infiniti

U121A Infiniti Code - Hard Disk Drive Write Malfunction

Quick Answer

Integrates Hard Disk Drive (HDD) allowing map data and music data to be stored. Common causes include Faulty Audio and Video (AV) Control Unit, Audio and Video Control Unit harness is open or shorted, Audio and Video Control Unit 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: U121A Infiniti indicates Hard Disk Drive Write Malfunction.
Common causes: Common causes include Faulty Audio and Video (AV) Control Unit, Audio and Video Control Unit harness is open or shorted, Audio and Video Control Unit 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 667

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 May 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U121A Infiniti Description

Integrates Hard Disk Drive (HDD) allowing map data and music data to be stored. It is the master unit of the MULTI AV system, and it is connected to each control unit by means of communication. It operates each system according to communication signals from the AV control unit. The AV control unit includes the audio, hands-free phone, voice control, navigation, and vehicle information functions. It is connected to ECM and combination meter via CAN communication to obtain necessary information for the vehicle information function.
The Diagnostic Trouble Code (DTC) sets when the Audio and Video (AV) Control Unit detects an internal malfunction of the Audio and Video (AV) Control Unit (HDD write malfunction).

OBDII Code U121A Infiniti - Hard Disk Drive Write Malfunction - AutoCodes.com — U121A Infiniti Code - Hard Disk Drive Write Malfunction

What does this mean?

What are the Possible Causes of the DTC U121A Infiniti?

Faulty Audio and Video (AV) Control Unit
Audio and Video Control Unit harness is open or shorted
Audio and Video Control Unit circuit poor electrical connection

How to Fix the DTC U121A Infiniti?

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 U121A Infiniti 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 U121A Infiniti Code

1. What are common symptoms of OBDII code U121A in an Infiniti related to Hard Disk Drive Write Malfunction?

- Common symptoms include issues with the navigation system, radio, or other infotainment features not functioning properly.

2. What can cause the OBDII code U121A in an Infiniti related to Hard Disk Drive Write Malfunction?

- The code U121A can be caused by a malfunction in the hard disk drive itself, software glitches, or wiring problems.

3. How can I diagnose the OBDII code U121A in my Infiniti related to Hard Disk Drive Write Malfunction?

- Diagnosis typically involves checking for other error codes, inspecting the wiring, and testing the functionality of the hard disk drive.

4. Can I still drive my Infiniti with the OBDII code U121A related to Hard Disk Drive Write Malfunction?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent further damage or inconvenience.

5. What are some repair tips for fixing the OBDII code U121A in an Infiniti related to Hard Disk Drive Write Malfunction?

- Repair may involve replacing the hard disk drive, updating software, or repairing any damaged wiring connections.

6. Is it possible to reset the OBDII code U121A in an Infiniti related to Hard Disk Drive Write Malfunction without repairs?

- Resetting the code without addressing the underlying issue may result in the problem reoccurring. It is best to diagnose and repair the root cause.

7. How much does it typically cost to repair the OBDII code U121A related to Hard Disk Drive Write Malfunction in an Infiniti?

- Repair costs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast fix the OBDII code U121A in an Infiniti related to Hard Disk Drive Write Malfunction?

- While some basic diagnostics can be done by DIY enthusiasts, resolving the issue may require specialized tools and expertise, making it challenging for most DIYers.

9. Will fixing the OBDII code U121A related to Hard Disk Drive Write Malfunction improve the overall performance of my Infiniti?

- Resolving the issue should restore the proper functionality of the affected systems, enhancing the overall performance and usability of the vehicle.

10. How long does it typically take to repair the OBDII code U121A in an Infiniti related to Hard Disk Drive Write Malfunction?

- The repair time can vary depending on the exact cause and complexity of the issue, but it may take a few hours to a full day to complete the repairs.