AutoCodes – Toyota – U1002 Toyota

U1002 Toyota 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 Toyota 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 2,467

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

What does this mean?

What are the Possible Causes of the DTC U1002 Toyota?

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 Toyota?

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 Toyota 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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Need Help with the Code?

Get the U1002 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

U1002 2013 Toyota RAV4 — Lost Communication with Gateway Module
U1002 2014 Toyota RAV4 — Lost Communication with Gateway Module
U1002 2015 Toyota RAV4 — Lost Communication with Gateway Module
U1002 2016 Toyota RAV4 — Lost Communication with Gateway Module
U1002 2017 Toyota RAV4 — Lost Communication with Gateway Module
U1002 2018 Toyota RAV4 — Lost Communication with Gateway Module

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 Toyota Code

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

- Common symptoms include the check engine light illuminating, issues with vehicle stability control, erratic shifting behavior in automatic transmissions, and loss of communication with certain vehicle modules.

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

- The code U1002 can be triggered by a faulty gateway module, damaged wiring or connectors, a software malfunction, low battery voltage, or issues with the communication network within the vehicle.

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

- To diagnose the issue, you can start by checking the gateway module for faults, inspecting the wiring and connectors for damage, testing the battery voltage, and using a diagnostic scanner to analyze the communication network.

4. Is it safe to continue driving my Toyota with OBDII code U1002 present?

- It is not recommended to drive the vehicle with code U1002 present, as it can lead to further communication issues between vehicle modules, potentially affecting the safety and performance of the vehicle.

5. Can OBDII code U1002 in a Toyota be repaired at home, or should I take it to a professional mechanic?

- Repairing OBDII code U1002 may require advanced diagnostic tools and expertise, so it is advisable to consult a professional mechanic who can accurately diagnose and repair the issue.

6. Are there any common tips for repairing OBDII code U1002 in a Toyota?

- Common repair tips include checking and repairing any damaged wiring or connectors, ensuring the gateway module is functioning correctly, updating software if needed, and resetting the fault code after repairs are completed.

7. Will resetting the OBDII code U1002 in my Toyota make the problem go away permanently?

- Resetting the fault code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair OBDII code U1002 in a Toyota?

- The cost of repairing OBDII code U1002 can vary depending on the cause of the issue, the labor rates of the mechanic, and the cost of any replacement parts needed. It is recommended to get a diagnosis and quote from a professional mechanic.

9. Can extreme weather conditions impact the occurrence of OBDII code U1002 in a Toyota?

- Extreme weather conditions, such as extreme cold or heat, can potentially affect the electrical components and wiring in the vehicle, leading to intermittent communication issues that may trigger code U1002.

10. How often should I expect to encounter OBDII code U1002 in a Toyota?

- OBDII code U1002 indicating lost communication with the gateway module is not a common occurrence in everyday driving. If the code appears frequently, it is a sign that there is an underlying issue that needs to be addressed.