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Engine-Codes – GMC – U2163 GMC

U2163 GMC Code - Lost Communication With Left Rear Door Module

Quick Answer

The U2163 GMC code indicates that there is a communication problem between the vehicle's main computer system and the left rear door module. Common causes include Faulty left rear door module, Damaged wiring or connectors between the main computer and the left rear door module, Corrosion or loose connections in the electrical system. 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, Damaged wiring or connectors between the main computer and the left rear door module, Corrosion or loose connections in the electrical system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code U2163 GMC Description

The U2163 GMC code indicates that there is a communication problem between the vehicle's main computer system and the left rear door module. The left rear door module is responsible for controlling various functions related to the left rear door, such as power windows, door locks, and interior lights. When communication is lost with this module, it can lead to issues with the proper functioning of these components.

OBDII Code U2163 GMC - Lost Communication With Left Rear Door Module
U2163 GMC Code - Lost Communication With Left Rear Door Module

Common Causes of U2163 GMC

  1. Faulty left rear door module.
  2. Damaged wiring or connectors between the main computer and the left rear door module.
  3. Corrosion or loose connections in the electrical system.
  4. Main computer malfunction.
  5. Water damage to the left rear door module or wiring.

Symptoms of U2163 GMC

  1. Power windows on the left rear door not functioning.
  2. Door locks on the left rear door not responding to the key fob or interior switch.
  3. Interior lights on the left rear door not turning on when the door is opened.
  4. Dashboard warning lights indicating a problem with the left rear door module.

How to Fix U2163 GMC

  1. Begin by conducting a visual inspection of the wiring and connectors between the main computer and the left rear door module to check for any visible damage or corrosion.
  2. Use a diagnostic tool to scan the vehicle's computer system and retrieve the specific trouble codes, including the U2163 code, to pinpoint the source of the communication loss.
  3. Test the left rear door module for functionality and replace it if necessary.
  4. Repair or replace any damaged wiring or connectors in the affected circuit.
  5. Clear the trouble codes from the vehicle's computer system and test the left rear door components to ensure they are functioning properly.

Cost to Fix U2163 GMC

The typical repair costs for addressing a U2163 GMC code can vary depending on the specific cause of the communication loss and the extent of the repairs needed. In general, the cost of replacing a left rear door module can range from $200 to $500, including parts and labor. If additional wiring repairs or computer diagnostics are required, the total cost could increase. It is advisable to consult with a qualified mechanic or auto repair shop to obtain an accurate estimate based on the vehicle's make and model, as well as the local labor rates. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to inquire about these factors before proceeding with the repair.

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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 $100–$300, while replacing and reprogramming the module can range from $300–$700 or more.

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