AutoCodes – Nissan – U121F Nissan

U121F Nissan Code - Audio and Video Control Unit Internal Communication

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: U121F Nissan indicates Audio and Video Control Unit Internal Communication.
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 9,390

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 U121F 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 (Internal communication error).

OBDII Code U121F Nissan - Audio and Video Control Unit Internal Communication - AutoCodes.com — U121F Nissan Code - Audio and Video Control Unit Internal Communication

What does this mean?

What are the Possible Causes of the DTC U121F 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 U121F 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 U121F 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 U121F Nissan Code

What does the OBDII code U121F mean for a Nissan vehicle?

The U121F code indicates a problem with the internal communication of the Audio and Video Control Unit, suggesting that it is not receiving or sending data properly within the vehicleâ€™s network.

What are some common symptoms of the U121F code?

Common symptoms include malfunctioning audio or video systems, intermittent or no sound, or issues with Bluetooth connectivity and other multimedia functions.

What could cause the U121F code to trigger?

The code can be triggered by a faulty Audio and Video Control Unit, damaged wiring or connectors, software issues, or communication failures between the control unit and other modules.

How can I diagnose the U121F code?

Start by using an OBDII scanner to confirm the code. Inspect the Audio and Video Control Unit and associated wiring for damage, check for loose connections, and look for any additional codes that may provide more context.

Are there any common fixes for the U121F code?

Common fixes include resetting the Audio and Video Control Unit, repairing or replacing damaged wiring or connectors, updating the vehicleâ€™s software, or replacing the control unit itself if it is defective.

Can I drive my Nissan with the U121F code?

While the vehicle may still be drivable, you may experience issues with audio and video functions. It is advisable to address the code to ensure all systems are functioning properly.

How much does it typically cost to repair issues related to the U121F code?

Repair costs can vary widely depending on the specific issue but may range from a simple wiring repair costing around $100 to $500 or more for replacing the Audio and Video Control Unit.

Is it necessary to clear the U121F code after repairs?

Yes, after making repairs, it is important to clear the code using an OBDII scanner and then perform a diagnostic test drive to ensure the issue is resolved and the code does not return.

What should I do if the U121F code keeps coming back?

If the code keeps returning, further diagnosis may be needed. Check for any underlying issues, ensure all connections are secure, and consider seeking help from a professional technician for more advanced troubleshooting.