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U1104 2016 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Quick Answer

The U1104 diagnostic trouble code (DTC) for a 2016 Toyota RAV4 indicates that there is a communication issue with the Driving Support Electronic Control Unit (ECU). Common causes include Loose or corroded wiring connections related to the Driving Support ECU, Faulty connectors or terminals affecting communication with the ECU, Malfunctioning Driving Support ECU. 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
U1104 2016 Toyota RAV4 indicates Lost Communication with Driving Support ECU.
Common causes
Common causes include Loose or corroded wiring connections related to the Driving Support ECU, Faulty connectors or terminals affecting communication with the ECU, Malfunctioning Driving Support ECU.
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 15, 2024
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Code U1104 2016 Toyota RAV4 Description

The U1104 diagnostic trouble code (DTC) for a 2016 Toyota RAV4 indicates that there is a communication issue with the Driving Support Electronic Control Unit (ECU). The Driving Support ECU is responsible for managing various driving assistance systems in the vehicle, such as lane departure warning, adaptive cruise control, and collision avoidance. When communication is lost with this ECU, it can lead to a loss of functionality in these systems, potentially compromising the safety and performance of the vehicle.

OBDII Code U1104 2016 Toyota RAV4 - Lost Communication with Driving Support ECU
U1104 2016 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Common Causes of U1104 2016 Toyota RAV4

  1. Loose or corroded wiring connections related to the Driving Support ECU.
  2. Faulty connectors or terminals affecting communication with the ECU.
  3. Malfunctioning Driving Support ECU.
  4. Communication network issues within the vehicle's system.
  5. Software glitches or programming errors affecting the ECU's operation.

Symptoms of U1104 2016 Toyota RAV4

  1. Malfunction indicator light (MIL) or check engine light illuminated on the dashboard.
  2. Loss of driving support features such as lane departure warning or adaptive cruise control.
  3. Erratic behavior of driving support systems.
  4. Difficulty engaging or disengaging driving support features.
  5. Inability to access driving support system settings through the vehicle's interface.

How to Fix U1104 2016 Toyota RAV4

  1. Begin by conducting a thorough inspection of the wiring harness and connectors associated with the Driving Support ECU to check for any loose connections or corrosion. Repair or replace any damaged wiring as needed.
  2. Use a diagnostic scan tool to communicate with the ECU and retrieve specific error codes to pinpoint the source of the communication issue.
  3. Test the Driving Support ECU for proper functionality and replace it if necessary.
  4. Check the vehicle's communication network for any faults or malfunctions that may be disrupting communication with the ECU.
  5. Clear the DTC and perform a test drive to ensure that the driving support features are functioning correctly after the repair.

Cost to Fix U1104 2016 Toyota RAV4

The typical repair costs for addressing a U1104 code on a 2016 Toyota RAV4 can vary depending on the specific cause of the communication issue. In general, the cost of parts such as wiring harnesses, connectors, or a new Driving Support ECU can range from $200 to $800 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair time varying based on the complexity of the issue.

What does this mean?

Tech Notes for U1104 2016 Toyota RAV4

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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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 U1104 2016 Toyota RAV4 Code

1. What are the common symptoms of OBDII code U1104 in a 2016 Toyota RAV4?

The common symptoms include issues with the vehicle's driving support systems, such as adaptive cruise control, lane-keeping assist, or collision warning not functioning properly.

2. What can cause the OBDII code U1104 "Lost Communication with Driving Support ECU" in a 2016 Toyota RAV4?

The code U1104 can be triggered by a faulty driving support ECU, damaged wiring or connectors, software glitches, or communication network issues in the vehicle.

3. How can I diagnose the cause of the U1104 code in my 2016 Toyota RAV4?

Diagnosing the U1104 code typically involves checking the connections to the driving support ECU, inspecting the wiring for damage, and using a diagnostic scanner to determine the specific communication issue.

4. Can I still drive my 2016 Toyota RAV4 with the U1104 code present?

It is generally safe to drive the vehicle with the U1104 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to ensure the proper functioning of driving support systems.

5. How can I repair the U1104 code in my 2016 Toyota RAV4?

Repairing the U1104 code may involve resetting the ECU, repairing or replacing damaged wiring or connectors, updating software, or replacing the driving support ECU if necessary.

6. Is it possible to clear the U1104 code in a 2016 Toyota RAV4 without fixing the underlying issue?

While clearing the code with a diagnostic scanner may temporarily turn off the warning light, it is crucial to address the root cause of the communication error to prevent the code from reappearing.

7. Will disconnecting the battery reset the U1104 code in my 2016 Toyota RAV4?

Disconnecting the battery may reset the ECU and clear the code temporarily, but if the underlying issue causing the communication error is not resolved, the code is likely to return.

8. How much does it cost to repair the U1104 code in a 2016 Toyota RAV4?

The cost of repairing the U1104 code can vary depending on the specific cause of the communication error, the extent of the repair needed, and whether any components need replacement. It is recommended to consult a professional for an accurate estimate.

9. Can a DIY enthusiast fix the U1104 code in a 2016 Toyota RAV4?

While some basic troubleshooting steps can be taken by DIY enthusiasts, diagnosing and repairing the U1104 code often requires specialized tools, technical knowledge, and expertise, so it is advisable to seek professional help.

10. How common is the U1104 code "Lost Communication with Driving Support ECU" in 2016 Toyota RAV4 vehicles?

The U1104 code is relatively uncommon but can occur in 2016 Toyota RAV4 models due to various factors such as electronic system failures, wiring issues, software glitches, or component malfunctions.

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