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U1104 2015 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Quick Answer

The U1104 diagnostic trouble code (DTC) for a 2015 Toyota RAV4 indicates that there is a communication issue with the Driving Support Electronic Control Unit (ECU). Common causes include Faulty wiring or connectors leading to the Driving Support ECU, Corrosion or damage to communication network components, 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 2015 Toyota RAV4 indicates Lost Communication with Driving Support ECU.
Common causes
Common causes include Faulty wiring or connectors leading to the Driving Support ECU, Corrosion or damage to communication network components, 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 13, 2024
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Code U1104 2015 Toyota RAV4 Description

The U1104 diagnostic trouble code (DTC) for a 2015 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 support systems in the vehicle, such as adaptive cruise control, lane departure warning, and collision avoidance systems. When communication is lost with this ECU, it can lead to the malfunction or complete failure of these driving support systems.

OBDII Code U1104 2015 Toyota RAV4 - Lost Communication with Driving Support ECU
U1104 2015 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Common Causes of U1104 2015 Toyota RAV4

  1. Faulty wiring or connectors leading to the Driving Support ECU.
  2. Corrosion or damage to communication network components.
  3. Malfunctioning Driving Support ECU.
  4. Software glitches or programming issues affecting communication.
  5. Electrical interference or disruptions in the vehicle's communication network.

Symptoms of U1104 2015 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 adaptive cruise control or lane departure warning.
  3. Erratic behavior or inconsistent performance of driving support features.
  4. Difficulty engaging or controlling driving support systems.
  5. Diagnostic trouble codes related to communication errors stored in the vehicle's computer system.

How to Fix U1104 2015 Toyota RAV4

  1. Begin by conducting a thorough visual inspection of wiring, connectors, and components related to the Driving Support ECU.
  2. Use a diagnostic scan tool to retrieve and document any stored trouble codes and perform a communication system check.
  3. Test the communication network for proper voltage, resistance, and continuity to identify any faults or interruptions.
  4. Inspect the Driving Support ECU for signs of damage or malfunction and replace if necessary.
  5. Clear any stored trouble codes, perform a test drive to verify proper operation of driving support systems, and recheck for any recurring communication issues.

Cost to Fix U1104 2015 Toyota RAV4

The typical repair costs for addressing a U1104 code on a 2015 Toyota RAV4 can vary depending on the specific cause of the communication issue. In general, the cost of parts such as wiring, connectors, or a replacement Driving Support ECU can range from $200 to $800. Labor costs for diagnosis and repair can add an additional $100 to $300, bringing the total estimated cost to $300 to $1100.

What does this mean?

Tech Notes for U1104 2015 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 2015 Toyota RAV4 Code

1. What does the OBDII code U1104 mean for a 2015 Toyota RAV4?

The code U1104 indicates a communication error with the Driving Support Electronic Control Unit (ECU) in your vehicle.

2. What are the common symptoms of a U1104 code in a 2015 Toyota RAV4?

Common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, loss of certain driving support features, and potential issues with the vehicle's overall performance.

3. What are some possible causes of a U1104 code in a 2015 Toyota RAV4?

Potential causes of the U1104 code 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 a U1104 code in my 2015 Toyota RAV4?

Diagnosing a U1104 code typically involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of wiring and connectors, and performing communication tests to identify the specific issue.

5. Is it safe to drive my 2015 Toyota RAV4 with a U1104 code?

While the vehicle may still be operable with a U1104 code, it is recommended to address the issue promptly to prevent potential safety risks and further damage to the driving support system.

6. Can I repair a U1104 code in my 2015 Toyota RAV4 myself?

Depending on your mechanical skills and access to tools, you may be able to address a U1104 code yourself by checking and repairing wiring connections, replacing faulty components, or resetting the ECU.

7. How much does it typically cost to repair a U1104 code in a 2015 Toyota RAV4?

The cost of repairing a U1104 code can vary depending on the specific cause of the issue, the extent of the repairs needed, and whether you choose to address the problem yourself or seek professional assistance.

8. Will resetting the trouble codes clear the U1104 code in my 2015 Toyota RAV4?

Resetting the trouble codes may temporarily clear the U1104 code, but if the underlying issue causing the communication error is not resolved, the code is likely to reappear.

9. Are there any recalls or technical service bulletins related to the U1104 code in a 2015 Toyota RAV4?

It's recommended to check with Toyota dealerships or online resources for any recalls or technical service bulletins related to the U1104 code in your specific vehicle model and year.

10. How can I prevent the U1104 code from occurring in my 2015 Toyota RAV4 in the future?

Regular maintenance, checking for loose or damaged wiring, and addressing any communication issues promptly can help prevent the U1104 code from occurring in your 2015 Toyota RAV4.

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