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U1104 2014 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Quick Answer

The U1104 diagnostic trouble code (DTC) for a 2014 Toyota RAV4 indicates that there is a communication issue between the vehicle's onboard computer system and the Driving Support Electronic Control Unit (ECU). Common causes include Damaged wiring or connectors related to the Driving Support ECU, Faulty Driving Support ECU, Software glitches in 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 2014 Toyota RAV4 indicates Lost Communication with Driving Support ECU.
Common causes
Common causes include Damaged wiring or connectors related to the Driving Support ECU, Faulty Driving Support ECU, Software glitches in 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 12, 2024
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Code U1104 2014 Toyota RAV4 Description

The U1104 diagnostic trouble code (DTC) for a 2014 Toyota RAV4 indicates that there is a communication issue between the vehicle's onboard computer system and the Driving Support Electronic Control Unit (ECU). The Driving Support ECU is responsible for managing various advanced driver assistance systems (ADAS) such as lane departure warning, adaptive cruise control, and collision avoidance systems. When communication is lost with this ECU, it can result in the malfunction or complete shutdown of these crucial safety features.

OBDII Code U1104 2014 Toyota RAV4 - Lost Communication with Driving Support ECU
U1104 2014 Toyota RAV4 Code - Lost Communication with Driving Support ECU

Common Causes of U1104 2014 Toyota RAV4

  1. Damaged wiring or connectors related to the Driving Support ECU
  2. Faulty Driving Support ECU
  3. Software glitches in the vehicle's computer system
  4. Corrosion or moisture affecting the communication lines
  5. Electrical interference from aftermarket accessories or modifications

Symptoms of U1104 2014 Toyota RAV4

  1. Warning lights on the dashboard related to ADAS features
  2. Inoperative lane departure warning system
  3. Adaptive cruise control not working properly
  4. Loss of collision avoidance system functionality
  5. Erratic behavior of the vehicle's electronic systems

How to Fix U1104 2014 Toyota RAV4

  1. Perform a thorough inspection of the wiring and connectors related to the Driving Support ECU to check for any damage or corrosion.
  2. Use a diagnostic scan tool to communicate with the ECU and identify any software glitches or faults.
  3. Test the Driving Support ECU to determine if it is functioning correctly or needs replacement.
  4. Clear the DTC and reset the vehicle's computer system to see if the communication issue is resolved.
  5. If necessary, replace any damaged wiring, connectors, or the Driving Support ECU to restore proper communication and functionality.

Cost to Fix U1104 2014 Toyota RAV4

The cost of repairing a U1104 code on a 2014 Toyota RAV4 can vary depending on the specific cause of the communication issue. In general, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that labor rates at auto repair shops can range from $80 to $150 per hour, so the total cost may fluctuate based on the shop's location and expertise. It's recommended to obtain a detailed quote from a reputable repair facility to get an accurate estimate for the repair.

What does this mean?

Tech Notes for U1104 2014 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 2014 Toyota RAV4 Code

1. What does the OBDII code U1104 in a 2014 Toyota RAV4 mean?

- The U1104 code indicates a "Lost Communication with Driving Support ECU" error in the vehicle's onboard diagnostics system.

2. What are the common symptoms of the U1104 code in a 2014 Toyota RAV4?

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

3. What are the possible causes of the U1104 code in a 2014 Toyota RAV4?

- The U1104 code can be triggered by issues such as a faulty driving support ECU, damaged wiring or connectors, a software malfunction, or a communication network problem.

4. How can I diagnose the U1104 code in my 2014 Toyota RAV4?

- Diagnosing the U1104 code typically involves using a diagnostic scan tool to retrieve the trouble codes, checking the driving support ECU for faults, inspecting the wiring and connectors, and performing a network communication test.

5. Can I still drive my 2014 Toyota RAV4 with the U1104 code present?

- It is not recommended to drive the vehicle with the U1104 code active, as it may affect the proper functioning of important driving support systems, compromising safety.

6. How can I repair the U1104 code in my 2014 Toyota RAV4?

- Repairing the U1104 code may involve fixing any wiring or connector issues, replacing a faulty driving support ECU, updating software if necessary, or addressing any communication network problems.

7. Can the U1104 code in a 2014 Toyota RAV4 be reset without fixing the underlying issue?

- While you can clear the U1104 code using a diagnostic scan tool, it is crucial to address the root cause of the problem to prevent the code from reoccurring.

8. Is the U1104 code common in 2014 Toyota RAV4 vehicles?

- The U1104 code is not extremely common, but it can occur in 2014 Toyota RAV4 models due to various factors affecting the driving support ECU and communication systems.

9. Will fixing the U1104 code require professional help or can it be done at home?

- Depending on the underlying issue causing the U1104 code, repairs may require professional assistance, especially when dealing with complex electronic components and system diagnostics.

10. How can I prevent the U1104 code from appearing in my 2014 Toyota RAV4 in the future?

- Regular maintenance, checking for wiring issues, ensuring proper connections, and addressing any warning signs promptly can help prevent the U1104 code from reoccurring in the future.

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