AutoCodes – Toyota – U1114 2018 Toyota RAV4

U1114 2018 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 2018 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 189

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 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 Main Switch Module has not been received.

OBDII Code U1114 2018 Toyota RAV4 - Lost Communication with Main Switch Module - AutoCodes.com — U1114 2018 Toyota RAV4 Code - Lost Communication with Main Switch Module

What does this mean?

What are the Possible Causes of the DTC U1114 2018 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 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 U1114 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 U1114 2018 Toyota RAV4 Code

1. What does the OBDII code U1114 on a 2018 Toyota RAV4 mean?

The U1114 code indicates a communication problem between the vehicle's main switch module and other control modules.

2. What are some common symptoms of a U1114 code in a 2018 Toyota RAV4?

Common symptoms include non-functional power windows, door locks, and other switches controlled by the main switch module.

3. What are the possible causes of a U1114 code in a 2018 Toyota RAV4?

Potential causes include a faulty main switch module, damaged wiring or connectors, a malfunctioning control module, or a communication network issue.

4. How can I diagnose a U1114 code in my 2018 Toyota RAV4?

Diagnosing a U1114 code typically involves using a scan tool to check for additional codes, inspecting the wiring and connectors for damage, and testing the main switch module and related components.

5. How can I repair a U1114 code in my 2018 Toyota RAV4?

Repair options may include replacing the main switch module, repairing damaged wiring or connectors, resetting the control modules, or addressing any communication network issues.

6. Can a U1114 code in a 2018 Toyota RAV4 be safely driven with?

While it may be possible to drive the vehicle with a U1114 code, it is recommended to address the issue promptly to prevent potential safety hazards or further damage to the electrical system.

7. Is it possible to reset a U1114 code in a 2018 Toyota RAV4 without professional help?

Resetting a U1114 code may be possible by disconnecting the car's battery for a few minutes, but it is advisable to have the underlying issue diagnosed and repaired to prevent the code from reoccurring.

8. Will a U1114 code in a 2018 Toyota RAV4 cause the Check Engine Light to illuminate?

The U1114 code may not directly trigger the Check Engine Light, but it could cause other warning lights to come on, indicating a problem with the vehicle's electrical system.

9. Are there any common DIY fixes for a U1114 code in a 2018 Toyota RAV4?

DIY fixes for a U1114 code may include checking and cleaning the connectors, inspecting the wiring for visible damage, and ensuring all fuses related to the affected systems are intact.

10. How much does it typically cost to repair a U1114 code in a 2018 Toyota RAV4?

The cost of repairing a U1114 code can vary depending on the underlying cause and the labor rates in your area. It is recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.