AutoCodes – Infiniti – U1000 2003 Infiniti G35

U1000 2003 Infiniti G35 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 2003 Infiniti G35 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 45,488

How popular is this code, among other codes? Medium

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 2003 Infiniti G35 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 2003 Infiniti G35 - CAN Communication Line Signal Malfunction - AutoCodes.com — U1000 2003 Infiniti G35 Code - CAN Communication Line Signal Malfunction

What does this mean?

What are the Possible Causes of the DTC U1000 2003 Infiniti G35?

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 2003 Infiniti G35?

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 factory service bulletin for the 2003 Infiniti G35:
2003 Infiniti G35 Factory Service Bulletin Code U1000

The service bulletin suggests cleaning engine and body harness ground connection to repair the problem.
- Clean/re-tighten ECM ground connections.
- Clean/re-tighten negative battery cable body connection and battery post connection.
- If needed, clean and ensure good contact between the steering member assembly and the left side instrument stay assembly.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1000 2003 Infiniti G35 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 U1000 2003 Infiniti G35 code?

Need more information on how to fix the U1000 2003 Infiniti G35 code? Get Access to Factory Service Manuals

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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 2003 Infiniti G35 Code

1. What does the OBDII code U1000 for a 2003 Infiniti G35 mean?

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

2. What are common symptoms of a U1000 code in a 2003 Infiniti G35?

Common symptoms include intermittent or complete loss of communication with various control modules, multiple warning lights on the dashboard, and issues with the vehicle's performance.

3. What are the possible causes of a U1000 code in a 2003 Infiniti G35?

Possible causes of the U1000 code include faulty wiring or connections in the CAN communication network, damaged control modules, a short circuit in the network, or a malfunctioning powertrain control module.

4. How can I diagnose a U1000 code on a 2003 Infiniti G35?

Diagnosing a U1000 code typically involves checking for other related trouble codes, inspecting the wiring and connectors in the CAN network, testing control modules for proper communication, and using a professional diagnostic scan tool to pinpoint the issue.

5. Can a U1000 code in a 2003 Infiniti G35 be fixed by resetting the ECU?

While resetting the ECU may temporarily clear the code, it is essential to diagnose and repair the underlying issue causing the U1000 code for a long-term solution.

6. Is it safe to continue driving with a U1000 code in a 2003 Infiniti G35?

It is not recommended to drive the vehicle with a U1000 code present, as it can lead to further electrical problems and potential safety hazards due to communication issues between critical control modules.

7. How much does it typically cost to repair a U1000 code in a 2003 Infiniti G35?

The cost of repairing a U1000 code can vary depending on the exact cause of the issue. It is advisable to consult with a professional mechanic for an accurate diagnosis and repair estimate.

8. Can a DIY enthusiast fix a U1000 code in a 2003 Infiniti G35?

Due to the complexity of diagnosing and repairing CAN communication issues, it is recommended to seek assistance from a qualified mechanic or technician with experience in automotive electronics.

9. Are there any preventive measures to avoid a U1000 code in a 2003 Infiniti G35?

Regular maintenance, such as checking for loose or corroded wiring connections, ensuring proper grounding, and promptly addressing any warning lights or unusual vehicle behavior, can help prevent CAN communication issues that trigger the U1000 code.

10. How long does it take to repair a U1000 code in a 2003 Infiniti G35?

The repair time for a U1000 code varies depending on the exact cause of the issue and the availability of parts. It is advisable to consult with a professional mechanic for a more accurate estimate of the repair duration.