AutoCodes – Lexus – U1117 Lexus

U1117 Lexus 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 Lexus 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 3,989

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 Lexus 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 Lexus - Lost Communication with Accessory Gateway - AutoCodes.com — U1117 Lexus Code - Lost Communication with Accessory Gateway

What does this mean?

What are the Possible Causes of the DTC U1117 Lexus?

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 Lexus?

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 Lexus 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 Lexus Code

1. What are the common symptoms of OBDII code U1117 in a Lexus indicating Lost Communication with Accessory Gateway?

- Common symptoms may include issues with power windows, door locks, interior lighting, or other accessories not functioning properly.

2. What are some possible causes of the U1117 code in a Lexus?

- Potential causes include a faulty accessory gateway module, wiring or connection issues, a blown fuse, or a malfunctioning control module.

3. How can I diagnose the U1117 code in my Lexus?

- Diagnosing the issue involves checking the wiring and connections related to the accessory gateway module, inspecting fuses, and using a scanner to communicate with the affected modules.

4. Can a DIY enthusiast repair the U1117 code in a Lexus?

- Depending on the underlying cause, some DIY repairs may be possible, such as checking and repairing wiring connections or replacing a blown fuse. However, complex issues may require professional diagnosis and repair.

5. Is it safe to continue driving with the U1117 code present in a Lexus?

- It is generally not recommended to drive with the U1117 code active, as it may lead to further electrical system issues or safety concerns if critical accessories are affected.

6. How much does it typically cost to repair the U1117 code in a Lexus?

- Repair costs can vary depending on the specific cause of the code, but they may range from a simple fuse replacement costing a few dollars to more extensive repairs involving module replacement that could be several hundred dollars.

7. Can resetting the fault codes clear the U1117 code in a Lexus?

- Resetting fault codes may temporarily clear the code, but if the underlying issue causing the Lost Communication with Accessory Gateway problem is not addressed, the code is likely to reappear.

8. Are there any common recalls related to the U1117 code in Lexus vehicles?

- It's essential to check with a Lexus dealership or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to the U1117 code in specific Lexus models.

9. How long does it typically take to diagnose and repair the U1117 code in a Lexus?

- The time needed for diagnosis and repair can vary based on the complexity of the issue. Simple fixes like checking connections may take a short time, while more involved repairs could require several hours or more.

10. Can extreme weather conditions affect the occurrence of the U1117 code in a Lexus?

- Extreme weather conditions, such as excessive heat or moisture, can sometimes exacerbate electrical issues leading to the U1117 code in a Lexus. It's essential to keep the vehicle protected and well-maintained in all weather conditions.