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U1117 Toyota Code - Lost Communication with Accessory Gateway

Quick Answer

The U1117 Toyota diagnostic trouble code (DTC) indicates that there is a communication issue with the vehicle's Accessory Gateway module. Common causes include Faulty Accessory Gateway module, Wiring or connection issues, Software glitch in the vehicle's communication system. 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 Toyota indicates Lost Communication with Accessory Gateway.
Common causes
Common causes include Faulty Accessory Gateway module, Wiring or connection issues, Software glitch in the vehicle's communication system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code U1117 Toyota Description

The U1117 Toyota diagnostic trouble code (DTC) indicates that there is a communication issue with the vehicle's Accessory Gateway module. The Accessory Gateway is a crucial component that acts as a central hub for various electronic systems in the vehicle, allowing them to communicate with each other. When communication with the Accessory Gateway is lost, it can lead to a variety of issues that affect the vehicle's performance and functionality.

OBDII Code U1117 Toyota - Lost Communication with Accessory Gateway
U1117 Toyota Code - Lost Communication with Accessory Gateway

Common Causes of U1117 Toyota

  1. Faulty Accessory Gateway module
  2. Wiring or connection issues
  3. Software glitch in the vehicle's communication system
  4. Problem with the vehicle's network communication

Symptoms of U1117 Toyota

  1. Inoperative power windows or locks
  2. Malfunctioning interior lighting
  3. Erratic behavior of climate control system
  4. Issues with entertainment system functionality
  5. Warning lights illuminated on the dashboard related to electronic systems

How to Fix U1117 Toyota

  1. Perform a thorough diagnostic scan to confirm the U1117 code and identify the specific cause of the communication failure.
  2. Inspect all wiring and connections related to the Accessory Gateway and repair any damaged or loose connections.
  3. Test the Accessory Gateway module for proper function and replace it if necessary.
  4. Check and update the software for the vehicle's communication system to ensure compatibility and functionality.
  5. Clear the code from the vehicle's computer and perform a final test to confirm that the issue has been resolved.

Cost to Fix U1117 Toyota

The typical repair costs for addressing a U1117 Toyota code can range from $200 to $500, depending on the specific cause of the communication failure and the labor involved in diagnosing and repairing the issue. It's important to note that these are rough estimates, and actual costs can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. Diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain a detailed quote from a trusted technician before proceeding with the repairs.

What does this mean?

Tech Notes for U1117 Toyota

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.

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Information for Specific Toyota Models

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 Toyota Code

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

U1117 indicates a loss of communication with the Accessory Gateway Module, which acts as a bridge for communication between various onboard systems.

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

Symptoms can include malfunctioning accessories, such as power windows or mirrors, abnormal dashboard warnings, or intermittent electronic issues.

3. What causes code U1117 to appear on a Toyota?

Common causes include a faulty Accessory Gateway Module, wiring or connection issues, a blown fuse, or a failing CAN bus network.

4. Can a weak battery trigger code U1117 on a Toyota?

Yes, a weak or failing battery can cause communication errors like U1117 by destabilizing the vehicle's electrical system.

5. How do you diagnose a U1117 code on a Toyota?

Diagnosis involves checking for wiring or connector damage, inspecting the Accessory Gateway Module, verifying power and ground signals, and ensuring proper communication on the CAN bus.

6. Is it safe to drive with a U1117 code on a Toyota?

While the vehicle may still be drivable, unresolved communication issues can lead to malfunctioning accessories or additional system errors over time.

7. How can you fix code U1117 on a Toyota?

Repairs may include reconnecting or replacing damaged wires, repairing connectors, replacing a faulty Accessory Gateway Module, or resetting the system.

8. Can an aftermarket accessory cause code U1117 on a Toyota?

Yes, improperly installed aftermarket accessories can disrupt the communication network and trigger this code.

9. Do you need to reprogram the Accessory Gateway Module if it's replaced?

In some cases, reprogramming or initialization may be required after replacing the module to ensure proper communication.

10. How much does it typically cost to fix code U1117 on a Toyota?

Costs vary depending on the root cause, but repairs could range from $100 for simple wiring fixes to $500 or more for module replacement and programming.

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