AutoCodes – Toyota – U0164 2018 Toyota RAV4

U0164 2018 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 2018 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 280

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 2018 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 2018 Toyota RAV4 - Lost Communication with Air Conditioner ECU - AutoCodes.com — U0164 2018 Toyota RAV4 Code - Lost Communication with Air Conditioner ECU

What does this mean?

What are the Possible Causes of the DTC U0164 2018 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 2018 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 2018 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 2018 Toyota RAV4 Code

1. What are the common symptoms of OBDII code U0164 in a 2018 Toyota RAV4?

- Common symptoms include the air conditioner not working properly, the climate control system malfunctioning, or the AC system shutting off unexpectedly.

2. What does the OBDII code U0164 indicating "Lost Communication with Air Conditioner ECU" mean in a 2018 Toyota RAV4?

- This code indicates a communication problem between the vehicle's onboard computer system and the Air Conditioner Electronic Control Unit (ECU).

3. What are possible causes of OBDII code U0164 in a 2018 Toyota RAV4?

- Possible causes include a faulty Air Conditioner ECU, damaged wiring or connectors, a blown fuse related to the AC system, or a software communication error.

4. How can I diagnose the cause of OBDII code U0164 in my 2018 Toyota RAV4?

- Diagnosis involves checking the wiring and connectors related to the Air Conditioner ECU, ensuring the AC system fuses are intact, and using a diagnostic tool to communicate with the affected ECU.

5. Can OBDII code U0164 in a 2018 Toyota RAV4 be fixed at home?

- Depending on the cause, some DIY fixes may be possible, such as checking and replacing blown fuses, but complex issues like ECU replacement may require professional help.

6. How urgent is it to address OBDII code U0164 in a 2018 Toyota RAV4?

- While the vehicle may still be operable with this code, it's important to address communication issues promptly to avoid potential long-term damage to the Air Conditioner ECU or related components.

7. Is it safe to continue driving with OBDII code U0164 present in a 2018 Toyota RAV4?

- It is generally safe to drive with this code, but it's advisable to address the underlying communication problem to ensure proper functioning of the air conditioning system.

8. What repair steps may be needed to resolve OBDII code U0164 in a 2018 Toyota RAV4?

- Repair steps may include checking and repairing wiring connections, replacing the Air Conditioner ECU if faulty, resetting the trouble code, and ensuring proper communication between systems.

9. How much can I expect to pay for fixing OBDII code U0164 in a 2018 Toyota RAV4?

- Repair costs for this code can vary widely based on the exact cause, but expect expenses for diagnosis, parts replacement, and labor, which can range from moderate to high.

10. Can OBDII code U0164 in a 2018 Toyota RAV4 come back after it's been fixed?

- If the root cause of the communication issue isn't properly addressed during the repair, there is a possibility of the code reoccurring. It's crucial to ensure thorough diagnosis and repair to prevent this.