AutoCodes – Toyota – U0164 2017 Toyota RAV4

U0164 2017 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 2017 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 255

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 2017 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 2017 Toyota RAV4 - Lost Communication with Air Conditioner ECU - AutoCodes.com — U0164 2017 Toyota RAV4 Code - Lost Communication with Air Conditioner ECU

What does this mean?

What are the Possible Causes of the DTC U0164 2017 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 2017 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 2017 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 2017 Toyota RAV4 Code

1. What are the common symptoms of OBDII code U0164 in a 2017 Toyota RAV4?

- Common symptoms include the air conditioning system not working, the AC compressor not engaging, and the inability to control the HVAC system.

2. What does the OBDII code U0164 indicate in a 2017 Toyota RAV4?

- The code U0164 indicates a "Lost Communication with Air Conditioner ECU" error, meaning there is a communication issue between the vehicle's onboard computer and the Air Conditioner Electronic Control Unit.

3. What are the possible causes of the U0164 code in a 2017 Toyota RAV4?

- Possible causes include a faulty Air Conditioner ECU, damaged wiring or connectors in the communication network, a malfunctioning CAN bus, or software issues.

4. How can I diagnose the U0164 code in my 2017 Toyota RAV4?

- Diagnosing the U0164 code typically involves checking the wiring and connectors related to the Air Conditioner ECU, testing the CAN bus for faults, and using a diagnostic tool to communicate with the ECU.

5. Can I continue driving my 2017 Toyota RAV4 with the U0164 code present?

- It is generally not recommended to drive the vehicle with the U0164 code active, as it can affect the functionality of the air conditioning system and potentially lead to other electrical issues.

6. How can I repair the U0164 code in my 2017 Toyota RAV4?

- Repairing the U0164 code may involve fixing any damaged wiring or connectors, replacing the Air Conditioner ECU if necessary, checking and repairing the CAN bus, and clearing the code with a diagnostic tool.

7. Is it possible to reset the U0164 code in a 2017 Toyota RAV4 without repairing the issue?

- While clearing the code temporarily may be possible with a diagnostic tool, it is essential to address the underlying communication problem to prevent the code from reoccurring.

8. Are there any DIY tips for resolving the U0164 code in a 2017 Toyota RAV4?

- DIY tips may include checking for loose or damaged wiring, ensuring all connectors are properly connected, and consulting the vehicle's service manual for specific troubleshooting steps.

9. How much does it cost to fix the U0164 code in a 2017 Toyota RAV4?

- The cost of fixing the U0164 code can vary depending on the underlying issue, but it may involve expenses for parts replacement, diagnostic services, and labor costs at a repair shop.

10. Can a regular mechanic repair the U0164 code in a 2017 Toyota RAV4, or do I need to visit a dealership?

- A regular mechanic with experience in diagnosing and repairing electrical issues should be able to address the U0164 code in a 2017 Toyota RAV4. However, a dealership or specialized auto repair shop may also provide expert assistance.