AutoCodes – Nissan – U12B0 Nissan

U12B0 Nissan Code - Power Supply Voltage Low

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Audio and Video (AV) Control Unit supply voltage exceeds lower limits. Common causes include Faulty Audio and Video (AV) Control Unit, AV Control Unit harness is open or shorted, AV 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: U12B0 Nissan indicates Power Supply Voltage Low.
Common causes: Common causes include Faulty Audio and Video (AV) Control Unit, AV Control Unit harness is open or shorted, AV 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 8,500

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 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U12B0 Nissan Description

The Diagnostic Trouble Code (DTC) sets when the Audio and Video (AV) Control Unit supply voltage exceeds lower limits.

OBDII Code U12B0 Nissan - Power Supply Voltage Low - AutoCodes.com — U12B0 Nissan Code - Power Supply Voltage Low

What does this mean?

What are the Possible Causes of the DTC U12B0 Nissan?

Faulty Audio and Video (AV) Control Unit
AV Control Unit harness is open or shorted
AV Control Unit circuit poor electrical connection

How to Fix the DTC U12B0 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 U12B0 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.

Need more information about the U12B0 Nissan code?

Need more information on how to fix the U12B0 Nissan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U12B0 Nissan 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 U12B0 Nissan Code

1. What are the common symptoms of OBDII code U12B0 Nissan (Power Supply Voltage Low)?

- Common symptoms include issues with starting the vehicle, dimming or flickering lights, and electrical malfunctions.

2. What are the possible causes of OBDII code U12B0 Nissan?

- Potential causes can include a weak or failing alternator, a faulty battery, loose or corroded connections, or a defective voltage regulator.

3. How can I diagnose the Power Supply Voltage Low issue in my Nissan?

- You can use a multimeter to check the voltage output of the alternator and battery, inspect the connections for corrosion or looseness, and perform a visual inspection of the battery and alternator for any signs of damage.

4. Can a low battery cause the U12B0 code in a Nissan?

- Yes, a weak or failing battery can lead to a low power supply voltage, triggering the U12B0 code in a Nissan.

5. What steps can I take to repair the Power Supply Voltage Low issue in my Nissan?

- Repair steps may include replacing the alternator, installing a new battery, cleaning or tightening electrical connections, or repairing/replacing the voltage regulator.

6. Is it safe to continue driving my Nissan with the U12B0 code present?

- It is not recommended to drive your vehicle with the U12B0 code triggered, as low power supply voltage can lead to various electrical system problems and potential breakdowns.

7. How much does it typically cost to repair the U12B0 code in a Nissan?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix the Power Supply Voltage Low issue in a Nissan?

- Depending on the level of expertise and access to tools, DIY enthusiasts may be able to diagnose and address some causes of the U12B0 code, such as checking and cleaning connections. However, more complex repairs may require professional assistance.

9. Will resetting the OBDII code U12B0 in my Nissan make the issue go away?

- Resetting the code without addressing the underlying problem will not fix the Power Supply Voltage Low issue. It is essential to diagnose and repair the root cause to prevent the code from reappearing.

10. How can I prevent the U12B0 code from coming back in my Nissan?

- Regular maintenance of the electrical system, including checking the battery, alternator, and connections, can help prevent the recurrence of the Power Supply Voltage Low issue in your Nissan.