AutoCodes – Lexus – U0163 Lexus

U0163 Lexus Code - Lost Communication with Navigation Control Module

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 Navigation Control Module, Navigation Control Module 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: U0163 Lexus indicates Lost Communication with Navigation Control Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Navigation Control Module, Navigation Control Module 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 774

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 U0163 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 Navigation Control Module has not been received.

OBDII Code U0163 Lexus - Lost Communication with Navigation Control Module - AutoCodes.com — U0163 Lexus Code - Lost Communication with Navigation Control Module

What does this mean?

What are the Possible Causes of the DTC U0163 Lexus?

Faulty Controller Area Network (CAN) Communication System
Faulty Navigation Control Module
Navigation Control Module harness is open or shorted
Navigation Control Module circuit poor electrical connection

How to Fix the DTC U0163 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 U0163 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 U0163 Lexus Code

1. What are common symptoms of OBDII code U0163 in a Lexus related to the Navigation Control Module?

- Common symptoms include the navigation system not functioning properly, error messages on the display screen, and loss of GPS signal.

2. What are some possible causes of the U0163 code indicating lost communication with the Navigation Control Module in a Lexus?

- Possible causes include a faulty navigation control module, wiring issues, a blown fuse, or a software glitch in the system.

3. How can I diagnose the U0163 code in my Lexus related to the Navigation Control Module?

- A diagnostic scan tool can be used to retrieve the specific trouble codes stored in the vehicle's computer system, helping identify the root cause of the communication loss.

4. What are some repair tips for resolving the U0163 code in a Lexus indicating lost communication with the Navigation Control Module?

- Check and replace any blown fuses related to the navigation system, inspect the wiring for any damage, and reset the navigation system by disconnecting the battery for a few minutes.

5. Is it safe to continue driving my Lexus with the U0163 code showing a lost communication issue with the Navigation Control Module?

- While the vehicle may still be operational, it is recommended to address the issue promptly to ensure the proper functioning of the navigation system and prevent any potential safety concerns.

6. Can a DIY enthusiast fix the U0163 code indicating lost communication with the Navigation Control Module in a Lexus?

- Depending on the root cause of the issue, some simple repairs like checking fuses or resetting the system can be done by DIY enthusiasts. For more complex issues, it is advisable to seek professional help.

7. How much does it typically cost to repair the U0163 code related to the Navigation Control Module in a Lexus?

- The cost of repairs can vary depending on the exact cause of the communication loss. Simple fixes like replacing a fuse may cost less, while more complex issues might require professional diagnosis and repair.

8. Are there any software updates available to address the U0163 code in a Lexus with a Navigation Control Module problem?

- Checking with a Lexus dealership or authorized service center can help determine if there are any software updates or recalls related to the navigation system that could resolve the communication issue.

9. What steps should I take if the U0163 code persists in my Lexus even after attempting basic repairs for the Navigation Control Module?

- If the issue persists, it is recommended to have the vehicle inspected by a qualified technician to diagnose and repair the underlying cause of the communication problem with the navigation control module.

10. Is the U0163 code indicating lost communication with the Navigation Control Module a common issue in Lexus vehicles?

- While relatively uncommon, issues with the navigation control module leading to the U0163 code can occur in Lexus vehicles, especially in older models or vehicles with high mileage.