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U1114 2013 Toyota RAV4 Code - Lost Communication with Main Switch 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 Main Switch Module, Main Switch 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: U1114 2013 Toyota RAV4 indicates Lost Communication with Main Switch Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Main Switch Module, Main Switch 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 240

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 U1114 2013 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 Main Switch Module has not been received.

OBDII Code U1114 2013 Toyota RAV4 - Lost Communication with Main Switch Module - AutoCodes.com — U1114 2013 Toyota RAV4 Code - Lost Communication with Main Switch Module

What does this mean?

What are the Possible Causes of the DTC U1114 2013 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Main Switch Module
Main Switch Module harness is open or shorted
Main Switch Module circuit poor electrical connection

How to Fix the DTC U1114 2013 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 U1114 2013 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 U1114 2013 Toyota RAV4 Code

1. What does the OBDII code U1114 for a 2013 Toyota RAV4 indicate?

The code U1114 signifies a communication issue with the Main Switch Module in the vehicle.

2. What are common symptoms of the U1114 code in a 2013 Toyota RAV4?

Common symptoms include non-functional switches, malfunctioning power windows, door locks not working, and issues with other electrical components controlled by the main switch module.

3. What are possible causes of the U1114 code in a 2013 Toyota RAV4?

Potential causes include a faulty main switch module, damaged wiring or connectors, issues with the CAN bus communication system, or a defective body control module.

4. How can you diagnose the U1114 code in a 2013 Toyota RAV4?

Diagnosis typically involves checking the wiring and connectors for damage, testing the main switch module for proper functionality, and using a scan tool to monitor communication on the CAN bus system.

5. Can the U1114 code be fixed by resetting the vehicle's computer?

Simply resetting the vehicle's computer may not resolve the U1114 code. It's essential to diagnose the root cause of the communication issue and address it accordingly.

6. Is it safe to continue driving a 2013 Toyota RAV4 with the U1114 code?

It is not recommended to drive the vehicle with the U1114 code present, as it may lead to further electrical issues or malfunctions in the vehicle's systems.

7. How much does it typically cost to repair the U1114 code in a 2013 Toyota RAV4?

The cost of repair can vary depending on the specific cause of the code, but it may involve replacing the main switch module, repairing wiring, or addressing other underlying issues. Costs can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast fix the U1114 code in a 2013 Toyota RAV4?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the U1114 code may require advanced knowledge, specialized tools, and experience with automotive electrical systems.

9. Will the U1114 code cause my 2013 Toyota RAV4 to fail an emissions test?

The U1114 code is related to communication issues and may not directly affect emissions. However, unresolved electrical problems in the vehicle could potentially lead to a failed emissions test.

10. How long does it typically take to repair the U1114 code in a 2013 Toyota RAV4?

The repair time can vary depending on the exact cause of the U1114 code and the availability of parts. In some cases, it may be resolved within a few hours, while more complex issues could take longer to diagnose and repair.