AutoCodes – Infiniti – U121D Infiniti

U121D Infiniti Code - Digital Signal Processor Connection

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: U121D Infiniti indicates Digital Signal Processor Connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,771

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U121D 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 (Digital Signal Processor (DSP) connection error).

OBDII Code U121D Infiniti - Digital Signal Processor Connection - AutoCodes.com — U121D Infiniti Code - Digital Signal Processor Connection

What does this mean?

What are the Possible Causes of the DTC U121D 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 U121D 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 U121D 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.

Need more information about the U121D Infiniti code?

Need more information on how to fix the U121D Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U121D Infiniti code diagnosed by a professional: Find a repair shop in your area

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 U121D Infiniti Code

1. What does the OBDII code U121D in an Infiniti indicate?

The U121D code in an Infiniti refers to a problem with the Digital Signal Processor Connection.

2. What are the common symptoms of OBDII code U121D in an Infiniti?

Common symptoms of the U121D code may include issues with the vehicle's audio system, navigation system, or other multimedia functions.

3. What are the possible causes of OBDII code U121D in an Infiniti?

Possible causes of the U121D code can include a faulty digital signal processor, wiring issues, or a poor connection in the multimedia system.

4. How can I diagnose the U121D code in my Infiniti?

To diagnose the U121D code, it is recommended to use a diagnostic scanner to retrieve the specific details of the code and then inspect the digital signal processor and related connections for any visible damage.

5. Can I still drive my Infiniti with the U121D code present?

While the U121D code may not affect the drivability of the vehicle, it is important to address the underlying issue to prevent further damage to the multimedia system.

6. How can I repair the U121D code in my Infiniti?

Repairing the U121D code may involve checking and repairing any damaged wiring, ensuring proper connections, or replacing the digital signal processor if necessary.

7. Will resetting the OBDII code U121D make it go away permanently?

Resetting the U121D code may temporarily clear the code, but if the underlying issue is not resolved, the code is likely to reappear.

8. Can a DIY enthusiast fix the U121D code in an Infiniti?

DIY enthusiasts with knowledge of automotive electronics may be able to diagnose and repair the U121D code if they have the necessary tools and expertise.

9. Is it necessary to visit a dealership for the U121D OBDII code in an Infiniti?

While visiting a dealership is recommended for precise diagnostics and repairs, independent mechanics with experience in Infiniti vehicles may also be able to address the U121D code.

10. How much can I expect to pay to fix the U121D code in my Infiniti?

The cost of repairing the U121D code can vary depending on the root cause of the issue, the extent of the repair needed, and labor costs at the repair facility. It is advisable to get multiple quotes for accurate pricing.