AutoCodes – Cadillac – U2166 Cadillac

U2166 Cadillac Code - Lost Communication With Driver Position Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Driver Position Module (DPM), Driver Position Module harness is open or shorted, Driver Position 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: U2166 Cadillac indicates Lost Communication With Driver Position Module.
Common causes: Common causes include Faulty Driver Position Module (DPM), Driver Position Module harness is open or shorted, Driver Position 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 595

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U2166 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 U2166 Cadillac - Lost Communication With Driver Position Module - AutoCodes.com — U2166 Cadillac Code - Lost Communication With Driver Position Module

What does this mean?

What are the Possible Causes of the DTC U2166 Cadillac?

Faulty Driver Position Module (DPM)
Driver Position Module harness is open or shorted
Driver Position Module circuit poor electrical connection

How to Fix the DTC U2166 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 U2166 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 U2166 Cadillac Code

What does the OBDII code U2166 indicate for a Cadillac?

The OBDII code U2166 indicates a "Lost Communication With Driver Position Module," meaning the vehicle's computer is not receiving signals from the driver position module.

What are the common symptoms associated with the U2166 code?

Common symptoms include the failure of power seat adjustments, inoperative memory seat settings, warning lights on the dashboard, and potential issues with other related electronic components.

What could cause the U2166 code to trigger?

The code can be triggered by a faulty driver position module, damaged wiring or connectors, issues with the vehicle's main computer, or problems with the power supply to the module.

How can I diagnose the U2166 code?

To diagnose U2166, check for any wiring issues or damaged connectors between the driver position module and the vehicle's computer. Use a scan tool to read any additional codes that may provide more context.

What should I check first when troubleshooting U2166?

Start by inspecting the wiring and connectors to the driver position module for any signs of damage, corrosion, or loose connections, as these are common culprits.

Can I drive my Cadillac safely with the U2166 code?

While it's generally safe to drive, the loss of functionality from the driver position module may affect comfort and safety features, so itâ€™s advisable to address the issue as soon as possible.

What is the typical cost to repair the U2166 code?

Repair costs can vary widely depending on the cause but may range from $100 to $600, encompassing diagnostics, parts replacement, and labor.

Is the U2166 code related to any other OBDII codes?

Yes, it may appear alongside other communication-related codes, which could indicate broader network issues within the vehicle's electronic systems.

How can I reset the U2166 code after repairs?

After addressing the underlying issue, you can reset the code by disconnecting the vehicle's battery for a few minutes or using an OBDII scanner to clear the trouble codes.