AutoCodes – Generic – U1240

U1240 Code - AV Switch Connection

Quick Answer

The A/C and Audio and Video (AV) Switch assembly power supply and ground circuit malfunction is detected. 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: U1240 indicates AV Switch 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 5,181

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 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

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

Code U1240 Description

The A/C and Audio and Video (AV) Switch assembly power supply and ground circuit malfunction is detected. A malfunction is detected in the communication circuit between AV control unit and A/C and AV switch assembly. A malfunction is detected in the communication signal between AV control unit and A/C and AV switch assembly.

OBDII Code U1240 - AV Switch Connection - AutoCodes.com — U1240 Code - AV Switch Connection

What does this mean?

What are the Possible Causes of the DTC U1240?

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 U1240?

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 U1240 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 U1240 code?

Need more information on how to fix the U1240 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1240 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1240 Infiniti — AV Switch Connection
U1240 Nissan — AV Switch Connection

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.