AutoCodes – Toyota – U1002 2018 Toyota RAV4

U1002 2018 Toyota RAV4 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 2018 Toyota RAV4 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 216

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 2018 Toyota RAV4 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 2018 Toyota RAV4 - Lost Communication with Gateway Module - AutoCodes.com — U1002 2018 Toyota RAV4 Code - Lost Communication with Gateway Module

What does this mean?

What are the Possible Causes of the DTC U1002 2018 Toyota RAV4?

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 2018 Toyota RAV4?

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 2018 Toyota RAV4 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 2018 Toyota RAV4 Code

1. What does the OBDII code U1002 in a 2018 Toyota RAV4 indicate?

The U1002 code signifies a communication problem with the Gateway Module, indicating a lost connection between the various control modules in the vehicle.

2. What are common symptoms of the U1002 code in a 2018 Toyota RAV4?

Common symptoms include issues with various vehicle systems such as the radio, air conditioning, power windows, and other electronic components not working properly.

3. What are possible causes of the U1002 code in a 2018 Toyota RAV4?

Potential causes of the U1002 code include a faulty gateway module, wiring or connection issues, software glitches, or a malfunctioning control module within the vehicle's network.

4. How can I diagnose the U1002 code in a 2018 Toyota RAV4?

Diagnosing the U1002 code typically involves using a professional OBDII scanner to communicate with the vehicle's onboard computer system and identify the specific module or communication line that is causing the issue.

5. Can I still drive my 2018 Toyota RAV4 with the U1002 code?

It is not recommended to drive the vehicle with the U1002 code present, as it can lead to further electrical problems and potential safety hazards due to the loss of communication between critical modules.

6. How can I repair the U1002 code in a 2018 Toyota RAV4?

Repairing the U1002 code may involve checking and repairing any damaged wiring, replacing a faulty gateway module, updating software, or resetting the communication network within the vehicle.

7. Will resetting the U1002 code resolve the issue in a 2018 Toyota RAV4?

While clearing the code may temporarily remove the warning light, it is crucial to address the underlying cause of the communication problem to prevent the issue from reoccurring.

8. Is the U1002 code a common issue in 2018 Toyota RAV4 vehicles?

The U1002 code related to lost communication with the Gateway Module is not extremely common but can occur due to various electrical or software-related issues in the vehicle.

9. Can a DIY enthusiast fix the U1002 code in a 2018 Toyota RAV4?

Depending on the underlying cause, some DIY enthusiasts with automotive repair experience may be able to diagnose and fix the U1002 code, but more complex issues may require professional assistance.

10. How much does it cost to repair the U1002 code in a 2018 Toyota RAV4?

The cost of repairing the U1002 code can vary widely depending on the specific cause of the communication problem, parts needed for replacement, and labor charges from a mechanic. It is advisable to get a diagnosis and estimate from a professional technician.