AutoCodes – Generic – U2163

U2163 Code - Lost Communication With Left Rear Door Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Left Rear Door Module (LRDM), Left Rear Door Module harness is open or shorted, Left Rear Door Module circuit poor electrical connection. 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: U2163 indicates Lost Communication With Left Rear Door Module.
Common causes: Common causes include Faulty Left Rear Door Module (LRDM), Left Rear Door Module harness is open or shorted, Left Rear Door Module circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 599

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 Jun 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U2163 Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2163 - Lost Communication With Left Rear Door Module - AutoCodes.com — U2163 Code - Lost Communication With Left Rear Door Module

What does this mean?

What are the Possible Causes of the DTC U2163?

Faulty Left Rear Door Module (LRDM)
Left Rear Door Module harness is open or shorted
Left Rear Door Module circuit poor electrical connection

How to Fix the DTC U2163?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U2163 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.

Need more information about the U2163 code?

Need more information on how to fix the U2163 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2163 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2163 Buick — Lost Communication With Left Rear Door Module
U2163 Cadillac — Lost Communication With Left Rear Door Module
U2163 Chevrolet — Lost Communication With Left Rear Door Module
U2163 GMC — Lost Communication With Left Rear Door Module

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 U2163 Code

1. What are common symptoms of OBDII code U2163 - Lost Communication With Left Rear Door Module?

- Common symptoms include non-functioning power windows, door locks, and interior lights on the left rear door.

2. What are possible causes of U2163 code?

- Possible causes include a faulty left rear door module, damaged wiring harness, loose connections, or a malfunctioning body control module.

3. How can I diagnose the issue related to code U2163?

- Diagnose the issue by checking the wiring harness for damage, ensuring all connections are secure, and using a scan tool to communicate with the left rear door module.

4. Can a DIY enthusiast repair the U2163 code issue?

- DIY enthusiasts may be able to repair the issue by checking and repairing damaged wiring, ensuring connections are secure, and replacing the left rear door module if necessary.

5. Is it safe to continue driving with the U2163 code present?

- It is generally safe to continue driving with the U2163 code, but it is recommended to address the issue promptly to avoid potential safety hazards or inconvenience.

6. How much does it typically cost to repair the U2163 code?

- The cost of repairing the U2163 code can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars if professional assistance is required.

7. Can weather conditions affect the occurrence of code U2163?

- Yes, extreme weather conditions such as heavy rain or extreme temperatures can sometimes lead to electrical issues that trigger the U2163 code.

8. Are there any preventative measures to avoid encountering the U2163 code?

- Regularly inspecting and maintaining the electrical components of the vehicle, especially the door modules and wiring, can help prevent issues like the U2163 code from occurring.

9. Will resetting the OBDII system clear the U2163 code?

- Resetting the OBDII system may temporarily clear the U2163 code, but if the underlying issue is not addressed, the code is likely to reappear.

10. Can the U2163 code affect other systems of the vehicle?

- While the U2163 code specifically relates to the left rear door module, issues with communication modules can sometimes impact other systems controlled by the body control module.