AutoCodes – Nissan – U121C Nissan

U121C Nissan 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 Nissan 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 464

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 Nissan 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 Nissan - Hard Disk Drive Access - AutoCodes.com — U121C Nissan Code - Hard Disk Drive Access

What does this mean?

What are the Possible Causes of the DTC U121C Nissan?

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 Nissan?

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 Nissan 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 Nissan Code

1. What are the common symptoms of OBDII code U121C in a Nissan related to Hard Disk Drive Access?

The common symptoms include issues accessing the hard disk drive, navigation system errors, and possible malfunction of audio or entertainment features.

2. What are the possible causes of OBDII code U121C in a Nissan related to Hard Disk Drive Access?

The code U121C in a Nissan can be triggered by a faulty hard disk drive, damaged wiring connections, or a malfunctioning control module.

3. How can I diagnose OBDII code U121C in a Nissan related to Hard Disk Drive Access?

Diagnosing code U121C involves checking the wiring connections to the hard disk drive, testing the hard disk drive itself, and using a diagnostic scanner to retrieve further information.

4. Can I repair OBDII code U121C in a Nissan related to Hard Disk Drive Access on my own?

Repairing code U121C may require technical knowledge and specialized tools. It is recommended to consult a professional mechanic or dealership for accurate diagnosis and repair.

5. Are there any temporary solutions for OBDII code U121C in a Nissan related to Hard Disk Drive Access?

In some cases, resetting the vehicle's system by disconnecting the battery for a few minutes may temporarily clear the code. However, it is advisable to address the root cause of the issue for a permanent solution.

6. Is it safe to continue driving with OBDII code U121C in a Nissan related to Hard Disk Drive Access?

While the vehicle may still be operable with this code, it is not recommended to ignore the issue. Continuing to drive with unresolved problems related to hard disk drive access may lead to further malfunctions or failures.

7. How much does it typically cost to repair OBDII code U121C in a Nissan related to Hard Disk Drive Access?

The cost of repairing code U121C can vary depending on the extent of the issue and the labor rates of the repair shop. It is advisable to obtain multiple quotes for an accurate estimate.

8. Can extreme weather conditions affect OBDII code U121C in a Nissan related to Hard Disk Drive Access?

Extreme temperatures or humidity levels can potentially impact the hard disk drive's functionality, leading to the triggering of code U121C. It is essential to keep the vehicle's interior environment stable.

9. Will disconnecting the hard disk drive temporarily resolve OBDII code U121C in a Nissan related to Hard Disk Drive Access?

Disconnecting the hard disk drive may temporarily clear the code, but it is not a recommended solution as it will disable important vehicle features connected to the drive.

10. How often should I check for OBDII code U121C in a Nissan related to Hard Disk Drive Access?

Regularly monitoring the vehicle's performance and addressing any unusual symptoms promptly can help prevent the recurrence of code U121C. If the code persists, it is essential to seek professional assistance for a thorough diagnosis.