AutoCodes – Infiniti – U121C Infiniti

U121C Infiniti Code - Hard Disk Drive Access

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: U121C Infiniti indicates Hard Disk Drive Access.
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 510

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 U121C 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 access error).

OBDII Code U121C Infiniti - Hard Disk Drive Access - AutoCodes.com — U121C Infiniti Code - Hard Disk Drive Access

What does this mean?

What are the Possible Causes of the DTC U121C 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 U121C 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 U121C 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 U121C Infiniti Code

1. What are the common symptoms of OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

The common symptoms include issues with the navigation system, audio system, and other infotainment features in the vehicle.

2. What could cause the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

The code U121C can be triggered by a faulty hard disk drive or issues with the data communication network in the vehicle.

3. How can I diagnose the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

Diagnosing this code requires specialized diagnostic tools to check the hard disk drive, wiring connections, and communication modules in the vehicle's entertainment system.

4. Can a DIY enthusiast repair the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

Repairing this code may require advanced technical knowledge and specialized equipment, so it is recommended to consult a professional technician for proper diagnosis and repair.

5. Is it safe to continue driving with the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

While the vehicle may still be operable with this code, it is advisable to address the issue promptly to prevent further damage to the entertainment system and ensure safe driving conditions.

6. How much does it cost to repair the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

The cost of repair can vary depending on the specific cause of the code, parts needed for replacement, and labor charges by the repair shop. It is recommended to obtain a detailed quote from a certified technician.

7. Can resetting the OBDII code U121C (Infiniti) related to Hard Disk Drive Access fix the issue temporarily?

Resetting the code may clear the error temporarily, but it is likely to reappear if the underlying issue with the hard disk drive access is not properly addressed.

8. Are there any preventive maintenance tips to avoid encountering the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

Regularly updating the vehicle's software, avoiding physical damage to the entertainment system components, and following recommended maintenance schedules can help prevent issues related to the hard disk drive access.

9. How long does it take to repair the OBDII code U121C (Infiniti) related to Hard Disk Drive Access?

The repair time can vary depending on the complexity of the issue, availability of parts, and the technician's workload. It is best to consult with the repair shop for an estimated repair timeline.

10. Can the OBDII code U121C (Infiniti) related to Hard Disk Drive Access be intermittent?

Yes, intermittent issues with the hard disk drive access or communication network can trigger the U121C code sporadically. Proper diagnosis is essential to pinpoint the root cause of the intermittent problem.