AutoCodes – Chevrolet – U1166 Chevrolet

U1166 Chevrolet Code - Lost Communications With Driver Seat Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Driver Seat Module, Driver Seat Module harness is open or shorted, Driver Seat 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: U1166 Chevrolet indicates Lost Communications With Driver Seat Module.
Common causes: Common causes include Faulty Driver Seat Module, Driver Seat Module harness is open or shorted, Driver Seat 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 1,550

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 Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1166 Chevrolet Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1166 is set.

OBDII Code U1166 Chevrolet - Lost Communications With Driver Seat Module - AutoCodes.com — U1166 Chevrolet Code - Lost Communications With Driver Seat Module

What does this mean?

What are the Possible Causes of the DTC U1166 Chevrolet?

Faulty Driver Seat Module
Driver Seat Module harness is open or shorted
Driver Seat Module circuit poor electrical connection

How to Fix the DTC U1166 Chevrolet?

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 U1166 Chevrolet 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 U1166 Chevrolet Code

1. What does the OBDII code U1166 for Chevrolet mean?

The code U1166 indicates a communication error between the vehicle's onboard diagnostic system and the driver seat module.

2. What are the common symptoms of a U1166 code in a Chevrolet?

Common symptoms include malfunctioning power seats, non-responsive seat adjustments, and warning lights on the dashboard related to the driver seat system.

3. What are the possible causes of a U1166 code in a Chevrolet?

Potential causes may include damaged wiring or connectors in the driver seat module circuit, a faulty driver seat module, or issues with the vehicle's main computer network.

4. How can I diagnose a U1166 code on my Chevrolet?

Diagnosing a U1166 code typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connectors for any visible damage, and testing the driver seat module for proper functionality.

5. Can I still drive my Chevrolet with a U1166 code?

While it may be possible to drive the vehicle with a U1166 code, it is recommended to address the issue promptly to avoid potential safety concerns and further damage to the driver seat system.

6. How can I repair a U1166 code in my Chevrolet?

Repair options may include repairing or replacing damaged wiring and connectors, replacing the driver seat module if necessary, and clearing the fault codes with a diagnostic scanner.

7. Is it safe to reset the U1166 code without fixing the underlying issue?

Resetting the code without addressing the root cause may temporarily turn off the warning lights, but the issue is likely to resurface, potentially leading to further problems with the driver seat module.

8. Can a U1166 code be a DIY fix for Chevrolet owners?

Depending on the underlying cause, some Chevrolet owners may be able to address a U1166 code themselves by inspecting the wiring, connectors, and driver seat module for visible damage and making necessary repairs.

9. How much does it typically cost to repair a U1166 code on a Chevrolet?

The cost of repairing a U1166 code can vary depending on the specific cause of the issue, the extent of the damage, and whether professional diagnostic services or replacement parts are needed.

10. Are there any preventive measures to avoid encountering a U1166 code in a Chevrolet?

To help prevent a U1166 code, Chevrolet owners can regularly inspect the driver seat system components, avoid overloading the power seat functions, and address any warning signs of electrical issues promptly.