AutoCodes – Toyota – U1114 2014 Toyota RAV4

U1114 2014 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 2014 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 245

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 2014 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 2014 Toyota RAV4 - Lost Communication with Main Switch Module - AutoCodes.com — U1114 2014 Toyota RAV4 Code - Lost Communication with Main Switch Module

What does this mean?

What are the Possible Causes of the DTC U1114 2014 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 2014 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 2014 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 2014 Toyota RAV4 Code

1. What does the OBDII code U1114 on a 2014 Toyota RAV4 indicate?

The U1114 code indicates a communication problem between the vehicle's onboard computer system and the Main Switch Module.

2. What are the common symptoms of a U1114 code in a 2014 Toyota RAV4?

Common symptoms include issues with power windows, mirrors, door locks, or other electrical components controlled by the Main Switch Module.

3. What are the possible causes of a U1114 code in a 2014 Toyota RAV4?

Possible causes include a faulty Main Switch Module, damaged wiring or connectors, a communication network issue, or a problem with the vehicle's onboard computer system.

4. How can I diagnose a U1114 code in my 2014 Toyota RAV4?

Diagnosis typically involves inspecting the Main Switch Module, checking for damaged wiring or connectors, testing the communication network, and using a scan tool to retrieve specific diagnostic trouble codes.

5. Can a U1114 code in a 2014 Toyota RAV4 be fixed easily?

Fixing a U1114 code may vary in difficulty depending on the exact cause. Simple fixes like repairing wiring or replacing a faulty Main Switch Module may be relatively straightforward, while issues with the communication network may require more extensive troubleshooting.

6. Is it safe to drive with a U1114 code present in a 2014 Toyota RAV4?

It is generally not recommended to drive with a U1114 code present, as it can affect the proper functioning of important vehicle systems controlled by the Main Switch Module.

7. How much does it typically cost to repair a U1114 code in a 2014 Toyota RAV4?

The cost of repairing a U1114 code can vary depending on the specific cause of the issue and the labor rates of the repair shop. Costs may include parts replacement, labor, and diagnostic fees.

8. Can I reset a U1114 code in my 2014 Toyota RAV4 without fixing the underlying issue?

While it is possible to clear the code using an OBDII scanner, the underlying issue causing the U1114 code will persist until it is properly diagnosed and repaired.

9. Will a U1114 code in a 2014 Toyota RAV4 cause the Check Engine Light to come on?

Yes, a U1114 code will typically trigger the Check Engine Light to illuminate on the dashboard of the 2014 Toyota RAV4.

10. How can I prevent a U1114 code from occurring in my 2014 Toyota RAV4?

Regular maintenance, inspection of electrical components, and addressing any issues promptly can help prevent the occurrence of a U1114 code in your Toyota RAV4.