AutoCodes – Lexus – U1002 Lexus

U1002 Lexus Code - Lost Communication with Gateway Module

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 Faulty Controller Area Network (CAN) Communication System, Faulty Gateway Module, Gateway Module harness is open or shorted. 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: U1002 Lexus indicates Lost Communication with Gateway Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Gateway Module, Gateway Module harness is open or shorted.
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 1,160

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 28, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1002 Lexus 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 a periodic message from the Gateway Module has not been received.

OBDII Code U1002 Lexus - Lost Communication with Gateway Module - AutoCodes.com — U1002 Lexus Code - Lost Communication with Gateway Module

What does this mean?

What are the Possible Causes of the DTC U1002 Lexus?

Faulty Controller Area Network (CAN) Communication System
Faulty Gateway Module
Gateway Module harness is open or shorted
Gateway Module circuit poor electrical connection

How to Fix the DTC U1002 Lexus?

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

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1002 Lexus 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 U1002 Lexus Code

1. What are the common symptoms of OBDII code U1002 in a Lexus indicating a lost communication with the gateway module?

- Common symptoms include issues with network communication, malfunctioning electronic components, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code U1002 in a Lexus?

- The code U1002 can be triggered by faulty wiring, damaged connectors, a malfunctioning gateway module, or issues related to the electronic control unit (ECU).

3. How can I diagnose the cause of OBDII code U1002 in my Lexus?

- To diagnose the issue, you may need to perform a thorough inspection of the wiring, connectors, gateway module, and ECU using a diagnostic scanner or multimeter.

4. Can a DIY enthusiast repair OBDII code U1002 in a Lexus?

- Repairing OBDII code U1002 may require advanced knowledge and tools. It is recommended to seek help from a professional mechanic or dealership to accurately diagnose and fix the issue.

5. What are some tips for resolving OBDII code U1002 in a Lexus?

- Check for loose or damaged wiring, ensure all connectors are securely attached, inspect the gateway module for any signs of damage, and reset the codes after performing any repairs.

6. Is it safe to continue driving with OBDII code U1002 in a Lexus?

- It is not recommended to drive the vehicle with unresolved OBDII code U1002, as it may lead to further electrical issues or potential safety hazards. Seek professional assistance as soon as possible.

7. How much does it typically cost to repair OBDII code U1002 in a Lexus?

- The cost of repairing OBDII code U1002 can vary depending on the underlying cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain a quote from a professional mechanic.

8. Can weather conditions affect the occurrence of OBDII code U1002 in a Lexus?

- Extreme weather conditions, such as high humidity or temperature fluctuations, can sometimes impact the electronic components in a vehicle and potentially trigger OBDII code U1002.

9. Are there any recalls related to OBDII code U1002 in Lexus vehicles?

- It is advisable to check with Lexus or the National Highway Traffic Safety Administration (NHTSA) for any recalls or technical service bulletins related to OBDII code U1002 in specific Lexus models.

10. How can I prevent OBDII code U1002 from occurring in my Lexus in the future?

- Regular maintenance, timely inspections, and addressing any electrical issues promptly can help prevent OBDII code U1002 from occurring in your Lexus.