U12B0 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 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.
Code U12B0 Description
What are the Possible Causes of the DTC U12B0?
- 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?
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 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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Information for Specific Makes
- U12B0 Infiniti — Power Supply Voltage Low
- U12B0 Nissan — Power Supply Voltage Low
Frequently Asked Questions about U12B0 Code
Q: What does the OBDII code U12B0 mean?
A: The U12B0 code indicates that the power supply voltage to a control module is lower than the specified range, which can disrupt proper module communication or functionality.
Q: What are the common symptoms of the U12B0 code?
A: Symptoms may include warning lights on the dashboard, intermittent electrical issues, communication errors between modules, or poor vehicle performance.
Q: What causes the U12B0 code to appear?
A: Common causes include a failing battery, loose or corroded battery terminals, faulty alternator, damaged wiring, or a malfunctioning control module.
Q: How do I diagnose the U12B0 code?
A: Start by checking the battery voltage and alternator output, inspect wiring and connectors for damage or corrosion, and use a diagnostic scanner to verify related module communication.
Q: Can a weak battery trigger the U12B0 code?
A: Yes, a weak or failing battery can lead to insufficient voltage, which may trigger this code.
Q: How can I fix the U12B0 code?
A: Repairs may involve replacing the battery, cleaning or tightening connections, repairing damaged wiring, or addressing a faulty alternator or control module.
Q: Does the U12B0 code affect vehicle drivability?
A: It can affect drivability if critical modules lose power or fail to communicate properly, potentially causing performance issues or limp mode.
Q: Can I clear the U12B0 code without repairs?
A: Clearing the code without addressing the root cause is not recommended, as the problem is likely to return until the issue is fixed.
Q: Is it safe to drive with the U12B0 code present?
A: Driving with this code may be unsafe if it leads to intermittent electrical failures or impacts essential systems like braking or steering.
Q: What tools are needed to troubleshoot the U12B0 code?
A: A multimeter to measure voltage, a diagnostic scanner to read live data and codes, and basic tools to inspect and repair wiring or connections.
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