AutoCodes – Cadillac – U2164 Cadillac

U2164 Cadillac Code - Lost Communication With Right 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 Right Rear Door Module (RRDM), Right Rear Door Module harness is open or shorted, Right 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: U2164 Cadillac indicates Lost Communication With Right Rear Door Module.
Common causes: Common causes include Faulty Right Rear Door Module (RRDM), Right Rear Door Module harness is open or shorted, Right 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 559

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 U2164 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 U2164 Cadillac - Lost Communication With Right Rear Door Module - AutoCodes.com — U2164 Cadillac Code - Lost Communication With Right Rear Door Module

What does this mean?

What are the Possible Causes of the DTC U2164 Cadillac?

Faulty Right Rear Door Module (RRDM)
Right Rear Door Module harness is open or shorted
Right Rear Door Module circuit poor electrical connection

How to Fix the DTC U2164 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 U2164 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 U2164 Cadillac Code

What does the OBDII code U2164 mean for my Cadillac?

The code U2164 indicates that there is a lost communication issue with the right rear door module, which may affect the functionality of features associated with that door.

What symptoms might I experience with the U2164 code?

Common symptoms include non-functioning power windows, locks, or lights in the right rear door, as well as potential issues with door ajar warnings or child lock features.

What could cause the U2164 code to trigger?

Possible causes include a faulty right rear door module, damaged wiring or connectors, a blown fuse, or issues with the vehicle's central communication network.

How can I diagnose the U2164 code?

Start by using an OBD-II scanner to confirm the code. Then, inspect the wiring and connectors for damage, check the fuses, and test the right rear door module for proper operation.

Can I fix the U2164 code myself?

If you're comfortable with automotive repairs, you can check the wiring and connections for issues, replace a blown fuse, or replace the right rear door module. However, advanced diagnostics may require professional assistance.

What should I do if the right rear door module is faulty?

If the module is determined to be faulty, it should be replaced with a new or refurbished unit. Ensure any programming or calibration is performed as needed for your vehicle.

Is it necessary to clear the code after repairs?

Yes, after making necessary repairs, you should clear the code using an OBD-II scanner and then test drive the vehicle to ensure the issue is resolved and that the code does not return.

Can the U2164 code affect other systems in my Cadillac?

Yes, since the right rear door module is part of the vehicle's communication network, issues with it can potentially impact other systems that rely on data from the module.

How can I prevent the U2164 code from occurring again?

Regular maintenance checks, inspecting wiring and connectors for wear or damage, and promptly addressing any electrical issues can help prevent the recurrence of the U2164 code.