AutoCodes – Buick – U2163 Buick

U2163 Buick 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 Buick 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.

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Code Popularity 525

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

What does this mean?

What are the Possible Causes of the DTC U2163 Buick?

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 Buick?

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 Buick 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 U2163 Buick Code

1. What does the OBDII code U2163 mean on a Buick?

U2163 indicates a "Lost Communication With Left Rear Door Module," meaning the vehicleâ€™s control modules cannot establish communication with the left rear door module.

2. What are the common symptoms of the U2163 code?

Symptoms may include inoperative left rear door locks, windows, or interior lights, as well as illuminated warning lights on the dashboard.

3. What causes the U2163 code to appear?

Common causes include a faulty left rear door module, damaged wiring or connectors, a blown fuse, or issues with the communication bus (CAN) network.

4. Can I drive my Buick with the U2163 code active?

Yes, but some features of the left rear door, such as locks or windows, may not function properly, which could be inconvenient or affect safety.

5. How do I diagnose the U2163 code?

Diagnosis involves scanning the vehicle with an OBDII tool, inspecting the left rear door module wiring and connectors, and testing the module for power, ground, and communication signals.

6. How can I fix the U2163 code on my Buick?

Repairs may include replacing the left rear door module, repairing damaged wiring or connectors, or resetting the module using a scan tool.

7. Is the U2163 code specific to Buicks?

No, U2163 can appear in other vehicles equipped with similar communication systems, but the left rear door module issue is specific to the affected model.

8. What tools are needed to troubleshoot the U2163 code?

Youâ€™ll need an OBDII scan tool, a multimeter for testing electrical connections, and possibly a wiring diagram for your Buick model.

9. Does a software update fix the U2163 code?

In some cases, a reprogramming or software update for the control modules may resolve communication issues, but this depends on the specific circumstances.

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

Repair costs vary depending on the issue, ranging from $50â€“$150 for minor wiring repairs to $200â€“$500 if the left rear door module needs replacement.