AutoCodes – Toyota – U1117 2017 Toyota RAV4

U1117 2017 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 2017 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 981

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 U1117 2017 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 2017 Toyota RAV4 - Lost Communication with Accessory Gateway - AutoCodes.com — U1117 2017 Toyota RAV4 Code - Lost Communication with Accessory Gateway

What does this mean?

What are the Possible Causes of the DTC U1117 2017 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 2017 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 2017 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 2017 Toyota RAV4 Code

1. What does the OBDII code U1117 for a 2017 Toyota RAV4 mean?

The code U1117 indicates a "Lost Communication with Accessory Gateway" error in the vehicle's communication system.

2. What are the common symptoms of the U1117 code on a 2017 Toyota RAV4?

Common symptoms include issues with the vehicle's accessories, such as power windows, door locks, or entertainment system not functioning properly.

3. What can cause the U1117 code to appear on a 2017 Toyota RAV4?

Possible causes for the U1117 code include damaged wiring, a faulty accessory gateway module, loose connections, or a malfunction in the communication network.

4. How can I diagnose the U1117 code on my 2017 Toyota RAV4?

Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, checking the wiring and connections related to the accessory gateway module, and testing the module itself for proper functionality.

5. Is it safe to drive with the U1117 code present on a 2017 Toyota RAV4?

It is generally not recommended to drive with the U1117 code active, as it can affect the proper functioning of essential vehicle accessories.

6. How can I repair the U1117 code on my 2017 Toyota RAV4?

Repairing the U1117 code may involve repairing or replacing damaged wiring, fixing loose connections, or replacing the faulty accessory gateway module.

7. Can I reset the U1117 code on my 2017 Toyota RAV4 without making repairs?

While you can clear the trouble code with a diagnostic scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Will the U1117 code on a 2017 Toyota RAV4 cause any damage if left unattended?

Leaving the U1117 code unresolved could potentially lead to further electrical issues in the vehicle and impact the functionality of important accessories.

9. How much does it cost to repair the U1117 code on a 2017 Toyota RAV4?

The cost of repairing the U1117 code can vary depending on the exact cause of the issue, parts needed for repair, and labor costs at the repair facility.

10. Can a DIY enthusiast fix the U1117 code on a 2017 Toyota RAV4?

While some basic troubleshooting and repairs may be possible for DIY enthusiasts, it is recommended to seek professional help for diagnosing and fixing complex electrical issues like the U1117 code.