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U1104 2017 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Quick Answer

The U1104 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates that there is a communication error between the vehicle's onboard computer system and the Driving Support Electronic Control Unit (ECU). Common causes include Faulty wiring or connections between the onboard computer system and the Driving Support ECU, A damaged or malfunctioning Driving Support ECU, Software issues or glitches within the vehicle's computer system. 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 2017 Toyota RAV4 indicates Lost Communication with Driving Support ECU.
Common causes
Common causes include Faulty wiring or connections between the onboard computer system and the Driving Support ECU, A damaged or malfunctioning Driving Support ECU, Software issues or glitches within the vehicle's computer system.
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 17, 2024
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Code U1104 2017 Toyota RAV4 Description

The U1104 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates that there is a communication error between the vehicle's onboard computer system and the Driving Support Electronic Control Unit (ECU). The Driving Support ECU is responsible for managing various driving support systems 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 vehicle's safety features.

OBDII Code U1104 2017 Toyota RAV4 - Lost Communication with Driving Support ECU
U1104 2017 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Common Causes of U1104 2017 Toyota RAV4

  1. Faulty wiring or connections between the onboard computer system and the Driving Support ECU.
  2. A damaged or malfunctioning Driving Support ECU.
  3. Software issues or glitches within the vehicle's computer system.
  4. Malfunctioning sensors that are crucial for communication between systems.
  5. Water damage or corrosion affecting the electronic components.

Symptoms of U1104 2017 Toyota RAV4

  1. Malfunction indicator light (MIL) or check engine light illuminated on the dashboard.
  2. Loss of functionality in driving support systems such as lane departure warning or adaptive cruise control.
  3. Erratic behavior or non-responsiveness of driving support features.
  4. Difficulty engaging or disengaging certain driving support functions.
  5. Reduced overall safety features while driving.

How to Fix U1104 2017 Toyota RAV4

  1. Begin by conducting a thorough inspection of the wiring and connections related to the Driving Support ECU to check for any visible damage or loose connections.
  2. Use a diagnostic scanner to retrieve and clear the U1104 code from the vehicle's computer system.
  3. Test the Driving Support ECU for functionality and replace it if necessary.
  4. Check and update the software within the vehicle's computer system to ensure compatibility and proper communication.
  5. Verify the integrity of the sensors involved in the communication process and replace any faulty components.

Cost to Fix U1104 2017 Toyota RAV4

The cost of repairing a U1104 code on a 2017 Toyota RAV4 can vary depending on the specific cause of the issue. On average, the repair costs for this type of communication error can range from $200 to $600, including parts and labor. However, it is important to note that prices can fluctuate based on factors such as location, dealership rates, and the extent of the repair needed. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, so it is advisable to inquire locally for a more accurate estimate.

What does this mean?

Tech Notes for U1104 2017 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 2017 Toyota RAV4 Code

1. What does the OBDII code U1104 mean for my 2017 Toyota RAV4?

The U1104 code indicates a communication error with the Driving Support ECU in your RAV4.

2. What are the common symptoms of U1104 code in a 2017 Toyota RAV4?

Common symptoms include loss of driving assistance features like lane departure warning or adaptive cruise control, as well as potential illumination of the check engine light.

3. What are the possible causes of the U1104 code in a 2017 Toyota RAV4?

Causes can include damaged wiring or connectors, a faulty Driving Support ECU, software issues, or a communication network problem within the vehicle.

4. How can I diagnose the U1104 code in my 2017 Toyota RAV4?

Diagnosis typically involves inspecting the wiring and connectors related to the Driving Support ECU, checking for any visible damages, and using a diagnostic scanner to analyze the communication network.

5. Can I drive my 2017 Toyota RAV4 with the U1104 code?

It is generally safe to drive the vehicle with the U1104 code, but you may experience a loss of certain driving assistance features until the issue is resolved.

6. How do I repair the U1104 code in my 2017 Toyota RAV4?

Repair methods can vary depending on the specific cause, but common solutions include repairing or replacing damaged wiring, connectors, or the Driving Support ECU.

7. Will resetting the U1104 code make it go away permanently?

Simply clearing the code may not resolve the underlying issue causing the communication error. It is important to diagnose and address the root cause of the problem for a permanent fix.

8. Is the U1104 code in a 2017 Toyota RAV4 a serious problem?

While it may not pose an immediate safety risk, addressing the U1104 code is important to ensure the proper functioning of driving assistance systems and to prevent potential future issues.

9. Can I fix the U1104 code in my 2017 Toyota RAV4 myself?

Depending on your level of automotive expertise, you may be able to address simpler causes such as loose connectors. However, more complex issues may require professional diagnosis and repair.

10. How much does it cost to fix the U1104 code in a 2017 Toyota RAV4?

The cost of repair can vary based on the specific cause of the U1104 code. It is recommended to obtain quotes from reputable auto repair shops for an accurate estimate.

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