AutoCodes – Nissan – U1000 2007 Nissan Altima Sedan

U1000 2007 Nissan Altima Sedan Code - CAN Communication Line Signal Malfunction

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Controller Area Network (CAN) communication harness is open or shorted, Faulty Engine Control Module (ECM), Poor harness ground 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: U1000 2007 Nissan Altima Sedan indicates CAN Communication Line Signal Malfunction.
Common causes: Common causes include Controller Area Network (CAN) communication harness is open or shorted, Faulty Engine Control Module (ECM), Poor harness ground 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 3,957

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 Mar 29, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1000 2007 Nissan Altima Sedan Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when the Engine Control Module (ECM) is not transmitting or receiving CAN communication signals for 2 seconds or more.

OBDII Code U1000 2007 Nissan Altima Sedan - CAN Communication Line Signal Malfunction - AutoCodes.com — U1000 2007 Nissan Altima Sedan Code - CAN Communication Line Signal Malfunction

What does this mean?

What are the Possible Causes of the DTC U1000 2007 Nissan Altima Sedan?

Controller Area Network (CAN) communication harness is open or shorted
Faulty Engine Control Module (ECM)
Poor harness ground connection.

How to Fix the DTC U1000 2007 Nissan Altima Sedan?

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 does this mean?

Code Tech Notes

There is a service bulletin for the 2007 Nissan Altima:
2007 Nissan Altima Factory Service Bulletin OBDII Code U1000

Usually, the problem is poor harness ground connection. The service bulletin suggests cleaning engine and body harness ground connection to repair the problem. Loosen the ground connectors clean them with sandpaper on the connector side and body side and retighten the bolts back.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1000 2007 Nissan Altima Sedan 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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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 U1000 2007 Nissan Altima Sedan Code

1. What does the OBDII code U1000 on a 2007 Nissan Altima Sedan indicate?

The U1000 code indicates a CAN communication line signal malfunction in the vehicle.

2. What are the common symptoms of a U1000 code in a 2007 Nissan Altima Sedan?

Common symptoms include intermittent or complete loss of communication with various control modules in the vehicle, erratic behavior of electronic components, and illuminated warning lights on the dashboard.

3. What are the possible causes of a U1000 code in a 2007 Nissan Altima Sedan?

Possible causes include damaged wiring or connectors in the CAN communication network, faulty control modules, water damage, or corrosion in the wiring harness, and electrical interference.

4. How can I diagnose a U1000 code in my 2007 Nissan Altima Sedan?

Diagnosis typically involves checking the wiring harness and connectors for damage, inspecting control modules for faults, testing for continuity in the CAN communication network, and using a professional diagnostic scanner to pinpoint the exact location of the malfunction.

5. Can I drive my 2007 Nissan Altima Sedan with a U1000 code?

It is not recommended to drive the vehicle with a U1000 code as it can lead to further electrical issues and potential safety hazards. It is best to address the problem promptly.

6. How can I repair a U1000 code in my 2007 Nissan Altima Sedan?

Repair options may include repairing or replacing damaged wiring or connectors, replacing faulty control modules, addressing water damage or corrosion, and ensuring proper grounding of the electrical system.

7. Will resetting the OBDII code U1000 on my 2007 Nissan Altima Sedan fix the issue?

Simply clearing the code without addressing the underlying problem will not fix the issue. It is essential to diagnose and repair the root cause of the U1000 code for a lasting solution.

8. How long does it take to repair a U1000 code in a 2007 Nissan Altima Sedan?

The repair time for a U1000 code can vary depending on the exact cause of the issue and the extent of the repair needed. It is best to consult a professional mechanic for a more accurate estimate.

9. Can a DIY enthusiast fix a U1000 code in a 2007 Nissan Altima Sedan?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing a U1000 code often requires specialized tools and expertise. It is recommended to seek professional help for this issue.

10. Is the U1000 code specific to the 2007 Nissan Altima Sedan?

The U1000 code is a generic code related to CAN communication line signal malfunctions and can appear in various vehicle makes and models, not just limited to the 2007 Nissan Altima Sedan.