AutoCodes – Lexus – U0164 Lexus

U0164 Lexus 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 Lexus 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 660

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 Lexus 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 Lexus - Lost Communication with Air Conditioner ECU - AutoCodes.com — U0164 Lexus Code - Lost Communication with Air Conditioner ECU

What does this mean?

What are the Possible Causes of the DTC U0164 Lexus?

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 Lexus?

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 Lexus 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 Lexus Code

1. What does the OBDII code U0164 for a Lexus mean?

The code U0164 indicates a communication problem between the vehicle's onboard computer and the Air Conditioner Electronic Control Unit (ECU).

2. What are the common symptoms of a U0164 code in a Lexus?

Common symptoms include issues with the air conditioning system not functioning properly, such as lack of cooling or heating, erratic blower operation, or complete system failure.

3. What are the possible causes of a U0164 code in a Lexus?

Potential causes include a faulty Air Conditioner ECU, damaged wiring or connectors in the communication network, software issues, or a malfunctioning powertrain control module.

4. How can I diagnose a U0164 code in my Lexus?

Diagnosis involves using a professional OBDII scanner to retrieve the specific code, checking for any additional related codes, examining the wiring and connectors for damage, and performing communication tests between the modules.

5. How is a U0164 code in a Lexus typically repaired?

Repair options may include replacing the Air Conditioner ECU, repairing or replacing damaged wiring or connectors, reprogramming the modules, or addressing any underlying issues causing the communication problem.

6. Can a U0164 code in a Lexus be fixed at home?

While basic diagnosis like checking for loose connections can be done at home, repairing a U0164 code often requires specialized tools and expertise, so it is recommended to consult a professional mechanic.

7. Are there any preventive measures to avoid a U0164 code in a Lexus?

Regular maintenance checks, addressing any electrical issues promptly, and ensuring proper handling of the vehicle's electronic components can help reduce the risk of encountering a U0164 code.

8. Is it safe to continue driving with a U0164 code in a Lexus?

It is not recommended to ignore a U0164 code, as it can lead to further electrical system problems or affect the overall performance of the vehicle. It is best to address the issue promptly.

9. How much does it typically cost to repair a U0164 code in a Lexus?

The cost of repair can vary depending on the specific cause of the issue, parts needed, labor rates, and location. It is advisable to get a professional diagnosis to determine an accurate estimate.

10. Can a U0164 code in a Lexus cause any long-term damage if left unresolved?

Continuing to drive with a U0164 code unresolved may lead to additional electrical problems, potential damage to other components, and could result in more costly repairs in the future.