AutoCodes – Infiniti – U1040 Infiniti

U1040 Infiniti Code - Engine Communication Circuit

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Engine Control Module (ECM) cannot transmit a communication signal to the generator. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: U1040 Infiniti indicates Engine Communication Circuit.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 1,221

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1040 Infiniti Description

The Diagnostic Trouble Code (DTC) sets when the Engine Control Module (ECM) cannot transmit a communication signal to the generator.

OBDII Code U1040 Infiniti - Engine Communication Circuit - AutoCodes.com — U1040 Infiniti Code - Engine Communication Circuit

What does this mean?

What are the Possible Causes of the DTC U1040 Infiniti?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC U1040 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 U1040 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 U1040 Infiniti code?

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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 U1040 Infiniti Code

1. What are the common symptoms of OBDII code U1040 in an Infiniti vehicle?

- Common symptoms include the check engine light illuminating, difficulty starting the vehicle, poor engine performance, and potential communication issues with other vehicle systems.

2. What does OBDII code U1040 in an Infiniti indicate?

- OBDII code U1040 indicates a problem with the engine communication circuit in the vehicle. It signifies a communication failure between the engine control module and other control modules.

3. What are the possible causes of OBDII code U1040 in an Infiniti?

- Possible causes of OBDII code U1040 include wiring or harness issues, a faulty engine control module, a defective communication module, or a poor connection in the communication circuit.

4. How can I diagnose OBDII code U1040 in my Infiniti?

- To diagnose OBDII code U1040, you can start by checking the wiring and connections in the engine communication circuit, inspecting the engine control module, and using a scan tool to communicate with the vehicle's systems for further troubleshooting.

5. Can I still drive my Infiniti with OBDII code U1040 present?

- It is not recommended to continue driving your Infiniti with OBDII code U1040 present, as the issue may affect the vehicle's performance and other systems. It is best to have the problem diagnosed and repaired as soon as possible.

6. How can I repair OBDII code U1040 in my Infiniti?

- Repairing OBDII code U1040 may involve fixing any wiring or connection issues, replacing a faulty engine control module or communication module, and ensuring proper communication between the vehicle's systems.

7. Will resetting the check engine light resolve OBDII code U1040 in my Infiniti?

- Simply resetting the check engine light will not resolve OBDII code U1040 in your Infiniti. The underlying issue causing the code needs to be diagnosed and repaired to prevent the code from reoccurring.

8. Is OBDII code U1040 specific to a certain Infiniti model?

- OBDII code U1040 can occur in various Infiniti models, as it relates to a problem with the engine communication circuit that can affect the communication between the engine control module and other modules in the vehicle.

9. Can a DIY enthusiast fix OBDII code U1040 in an Infiniti?

- While some simple checks and repairs may be possible for a DIY enthusiast, diagnosing and repairing OBDII code U1040 may require specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

10. How much does it typically cost to repair OBDII code U1040 in an Infiniti?

- The cost to repair OBDII code U1040 in an Infiniti can vary depending on the underlying cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.