AutoCodes – Cadillac – U2163 Cadillac

U2163 Cadillac 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 Cadillac 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 531

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

What does this mean?

What are the Possible Causes of the DTC U2163 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U2163 in a Cadillac related to lost communication with the left rear door module?

- Common symptoms include issues with the power windows, door locks, interior lights, and other electrical functions controlled by the left rear door module.

2. What are some possible causes of the U2163 code indicating lost communication with the left rear door module in a Cadillac?

- Potential causes may include a loose or damaged wiring harness, a faulty door module, a blown fuse, or a malfunctioning body control module.

3. How can I diagnose the U2163 trouble code in my Cadillac to pinpoint the exact issue with the left rear door module communication?

- Perform a visual inspection of the wiring harness, check for blown fuses, conduct a scan tool diagnostic to identify the specific module communication fault.

4. Is it safe to continue driving my Cadillac with the U2163 code related to lost communication with the left rear door module?

- It is generally safe to drive the vehicle, but it is recommended to address the issue promptly to avoid further electrical problems or inconvenience.

5. Can I reset the U2163 trouble code in my Cadillac without fixing the communication issue with the left rear door module?

- While you can clear the code temporarily, it will likely return until the underlying problem with the left rear door module communication is resolved.

6. Are there any DIY repair tips for resolving the U2163 code in a Cadillac due to lost communication with the left rear door module?

- DIY repair tips may include checking and securing the wiring connections, inspecting and replacing any damaged fuses, and testing the door module for functionality.

7. How much can I expect to pay for professional repair of the U2163 trouble code in a Cadillac related to the left rear door module issue?

- Repair costs can vary depending on the exact cause of the problem, but expect to pay anywhere from $100 to $300 for parts and labor.

8. Can a malfunctioning left rear door module affect other systems in my Cadillac besides the power windows and door locks?

- Yes, a faulty left rear door module can potentially impact other vehicle systems controlled by the body control module, such as lighting, security, and climate control.

9. How long does it typically take to diagnose and repair the U2163 code indicating lost communication with the left rear door module in a Cadillac?

- The diagnosis and repair process can usually be completed within a few hours to a day, depending on the complexity of the issue and availability of parts.

10. Should I consider replacing the left rear door module if I continue to experience communication issues even after diagnosing and attempting repairs?

- If all other troubleshooting steps fail to resolve the problem, replacing the left rear door module may be necessary to restore proper communication and functionality in your Cadillac.