AutoCodes – Toyota – U0164 2015 Toyota RAV4

U0164 2015 Toyota RAV4 Code - Lost Communication with Air Conditioner ECU

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 Air Conditioner ECU, Air Conditioner ECU 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: U0164 2015 Toyota RAV4 indicates Lost Communication with Air Conditioner ECU.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Air Conditioner ECU, Air Conditioner ECU 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 348

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 27, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0164 2015 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 Air Conditioner ECU has not been received.

OBDII Code U0164 2015 Toyota RAV4 - Lost Communication with Air Conditioner ECU - AutoCodes.com — U0164 2015 Toyota RAV4 Code - Lost Communication with Air Conditioner ECU

What does this mean?

What are the Possible Causes of the DTC U0164 2015 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Air Conditioner ECU
Air Conditioner ECU harness is open or shorted
Air Conditioner ECU circuit poor electrical connection

How to Fix the DTC U0164 2015 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 U0164 2015 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 U0164 2015 Toyota RAV4 Code

1. What are the common symptoms of OBDII code U0164 in a 2015 Toyota RAV4?

- Common symptoms include issues with the air conditioning system, such as lack of cold air, inconsistent cooling, or complete failure of the AC system.

2. What does the OBDII code U0164 indicate in a 2015 Toyota RAV4?

- Code U0164 signifies a communication problem between the vehicle's onboard computer system and the Air Conditioner Electronic Control Unit (ECU).

3. What are the possible causes of the U0164 code in a 2015 Toyota RAV4?

- The code can be triggered by damaged wiring, loose connections, a faulty Air Conditioner ECU, a malfunctioning CAN bus system, or issues in the communication network.

4. How can I diagnose the U0164 code in my 2015 Toyota RAV4?

- Diagnosing the U0164 code typically involves checking the wiring connections, inspecting the Air Conditioner ECU for any damage, and using a diagnostic scanner to identify the communication error.

5. Is it safe to drive my 2015 Toyota RAV4 with the U0164 code present?

- It is generally safe to drive the vehicle, but you may experience discomfort due to the air conditioning issues. Getting the problem fixed promptly is recommended for optimal comfort and performance.

6. Can I repair the U0164 code in my 2015 Toyota RAV4 myself?

- While some basic troubleshooting like checking connections can be done by DIY enthusiasts, diagnosing and repairing the root cause of the U0164 code may require professional expertise and specialized tools.

7. How much does it cost to fix the U0164 code in a 2015 Toyota RAV4?

- The cost of fixing the U0164 code can vary depending on the underlying issue. It could range from a simple fix like re-connecting a wire to a more complex repair involving component replacement, potentially costing a few hundred dollars.

8. Can a low car battery cause the U0164 code in a 2015 Toyota RAV4?

- A low car battery can potentially lead to communication errors that trigger the U0164 code. Ensuring your vehicle's battery is in good condition is essential for optimal system performance.

9. Will resetting the OBDII system clear the U0164 code in a 2015 Toyota RAV4?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the communication error persists, the code is likely to reappear. It's important to diagnose and fix the root cause.

10. How long does it take to repair the U0164 code in a 2015 Toyota RAV4?

- The repair time for the U0164 code can vary based on the specific cause and complexity of the issue. Simple fixes may take a few hours, while more involved repairs could require a day or more.