AutoCodes – GMC – U2163 GMC

U2163 GMC 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 GMC 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 425

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

What does this mean?

What are the Possible Causes of the DTC U2163 GMC?

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 GMC?

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 GMC 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 GMC Code

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

U2163 indicates a loss of communication between the vehicle's main control modules and the Left Rear Door Module, which manages functions like windows, locks, and lights for that door.

2. What are the common symptoms of code U2163?

Symptoms may include the left rear door window not working, door locks malfunctioning, interior lights on that door not responding, or the check engine light or other warning lights being illuminated.

3. What causes the U2163 code to appear?

Common causes include a faulty Left Rear Door Module, wiring or connector issues such as corrosion or damage, or communication bus (CAN) network faults.

4. Can a weak battery cause the U2163 code?

Yes, a weak or failing battery can sometimes disrupt communication between modules, leading to a U2163 code.

5. How do I diagnose the U2163 code on a GMC vehicle?

Start by inspecting the wiring and connectors to the Left Rear Door Module for damage or corrosion. Use a scan tool to check for other related codes and test the module's communication on the CAN network.

6. Can I drive my GMC with a U2163 code?

Yes, the vehicle is usually drivable, but left rear door features like the locks or window may not function properly, which could be inconvenient or unsafe in some situations.

7. How is the U2163 code fixed?

Repairs may involve replacing the Left Rear Door Module, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the module using a specialized scan tool.

8. Is reprogramming always required to fix the U2163 code?

Not always. Reprogramming may be needed if the module is replaced or if a software update is required, but some issues can be resolved by repairing wiring or connections.

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

A professional-grade diagnostic scan tool, a multimeter for testing wiring, and possibly a CAN network tester are essential for troubleshooting this code.

10. How much does it cost to fix the U2163 code on a GMC?

Repair costs vary depending on the cause. Fixing wiring or connector issues may cost around $100â€“$300, while replacing and reprogramming the module can range from $300â€“$700 or more.