AutoCodes – Generic – U121F

U121F 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 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 1,988

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

What does this mean?

What are the Possible Causes of the DTC U121F?

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?

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 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.

Need more information about the U121F code?

Need more information on how to fix the U121F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U121F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U121F Infiniti — Audio and Video Control Unit Internal Communication
U121F Nissan — Audio and Video Control Unit Internal Communication

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 Code

1. What are the common symptoms of OBDII code U121F (Audio and Video Control Unit Internal Communication)?

- Common symptoms include loss of audio or video functionality in the vehicle, such as no sound from speakers or a blank screen on the display.

2. What are some possible causes of OBDII code U121F?

- The code U121F is often triggered by a malfunction in the audio and video control unit, faulty wiring or connections, or software issues within the unit.

3. How do I diagnose the OBDII code U121F?

- Diagnosing the code U121F typically involves using a diagnostic scanner to retrieve the code, checking for any associated codes, and then inspecting the audio and video control unit, wiring, and connections for any visible damage.

4. Can a DIY enthusiast repair OBDII code U121F?

- Repairing OBDII code U121F may require advanced technical knowledge and specialized tools. It is recommended to consult with a professional mechanic or technician for proper diagnosis and repairs.

5. What are some repair tips for fixing OBDII code U121F?

- Repair tips for U121F may include checking and repairing any damaged wiring or connections, updating the software in the audio and video control unit, or replacing the control unit if necessary.

6. Is it safe to continue driving with OBDII code U121F present?

- It is generally not recommended to continue driving with OBDII code U121F present, as it can affect the overall functionality of the audio and video systems in the vehicle.

7. How much does it typically cost to repair OBDII code U121F?

- The cost of repairing OBDII code U121F can vary depending on the specific issue causing the code, the extent of repairs needed, and the labor rates of the repair shop. It is advisable to obtain quotes from different service providers.

8. Can resetting the OBDII system clear code U121F?

- Resetting the OBDII system may temporarily clear the code U121F, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the code.

9. Are there any recalls related to OBDII code U121F?

- Recalls related to OBDII code U121F vary by vehicle manufacturer. It is recommended to check with the manufacturer or a local dealership to inquire about any related recalls for your specific vehicle.

10. How can I prevent OBDII code U121F from recurring?

- To prevent OBDII code U121F from recurring, it is important to address any underlying issues promptly, perform regular maintenance on the audio and video control unit, and follow the manufacturer's recommended service schedule.