Engine-Codes - Infiniti - U1000 INFINITI

U1000 INFINITI - CAN Communication Line - Signal Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U1000 INFINITI Possible Causes

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

How is the U1000 INFINITI code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

There is a factory service bulletin for the following Infiniti models:
- 2002-2004 Infiniti I35
- 2002-2006 Infiniti Q45
- 2004-2006 Infiniti QX56
- 2003-2006 Infiniti FX
- 2003-2006 Infiniti G35
- 2003-2004 Infiniti M45
- 2006 Infiniti M
Infiniti 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.

There is another Infiniti service bulletin with tips to diagnose the U1000 code:
Infiniti Service Bulletin Code U1000 Diagnostic Tips and Guidelines

What is the cost to diagnose the U1000 INFINITI code

Labor: 1.0

The cost to diagnose the U1000 INFINITI code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U1000 INFINITI Meaning

The Controller Area Network (CAN) is a serial communication line for real-time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads the required data only.
The Diagnostic Trouble Code (DTC) sets when the Engine Control Module (ECM) is not transmitting or receiving CAN communication signals of OBD (emission-related diagnosis) for 2 seconds or more.

More Information

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