AutoCodes – Toyota – U1117 2018 Toyota RAV4

U1117 2018 Toyota RAV4 Code - Lost Communication with Accessory Gateway

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 Multiplex Network Door ECU, Multiplex Network Door ECU 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: U1117 2018 Toyota RAV4 indicates Lost Communication with Accessory Gateway.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Multiplex Network Door ECU, Multiplex Network Door ECU 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 1,800

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U1117 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 Multiplex Network Door ECU has not been received.

OBDII Code U1117 2018 Toyota RAV4 - Lost Communication with Accessory Gateway - AutoCodes.com — U1117 2018 Toyota RAV4 Code - Lost Communication with Accessory Gateway

What does this mean?

What are the Possible Causes of the DTC U1117 2018 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Multiplex Network Door ECU
Multiplex Network Door ECU harness is open or shorted
Multiplex Network Door ECU circuit poor electrical connection

How to Fix the DTC U1117 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 U1117 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 U1117 2018 Toyota RAV4 Code

1. What does the OBDII code U1117 on a 2018 Toyota RAV4 mean?

The U1117 code indicates a communication problem between the vehicle's control modules and the Accessory Gateway module.

2. What are the common symptoms of U1117 code in a 2018 Toyota RAV4?

Common symptoms may include loss of communication with certain vehicle systems, malfunction indicator light (MIL) on the dashboard, and potential issues with accessories or features controlled by the Accessory Gateway.

3. What are the possible causes of U1117 code in a 2018 Toyota RAV4?

Possible causes of the U1117 code include damaged wiring or connectors, a faulty Accessory Gateway module, software issues, or a problem with the vehicle's control modules.

4. How can I diagnose the U1117 code on my 2018 Toyota RAV4?

Diagnosing the U1117 code typically involves using an OBDII scanner to retrieve the code and performing a thorough inspection of the wiring, connectors, and modules related to the Accessory Gateway system.

5. Can I still drive my 2018 Toyota RAV4 with the U1117 code present?

It is generally not recommended to drive the vehicle with the U1117 code active, as it may lead to further communication issues and potential malfunctions of critical vehicle systems.

6. How can I repair the U1117 code on my 2018 Toyota RAV4?

Repairing the U1117 code may involve repairing or replacing damaged wiring or connectors, replacing the Accessory Gateway module if necessary, updating software, or addressing any underlying issues with the control modules.

7. Is it possible to reset the U1117 code on a 2018 Toyota RAV4?

Resetting the U1117 code can be done using an OBDII scanner after the underlying issue has been diagnosed and repaired. However, simply clearing the code without addressing the root cause may lead to it reoccurring.

8. Will the U1117 code cause my 2018 Toyota RAV4 to fail an emissions test?

The U1117 code itself may not directly cause the vehicle to fail an emissions test, but it is indicative of a potential issue with the vehicle's communication systems that should be addressed to ensure proper functionality.

9. How much does it typically cost to repair the U1117 code on a 2018 Toyota RAV4?

The cost of repairing the U1117 code can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor rates. It is recommended to consult with a qualified mechanic for an accurate estimate.

10. Can the U1117 code on a 2018 Toyota RAV4 be a recurring issue?

If the underlying cause of the U1117 code is not properly addressed, it is possible for the code to reoccur. Proper diagnosis and repair of the communication issue are essential to prevent the code from coming back.