AutoCodes – Buick – U1161 Buick

U1161 Buick Code - Lost Communications With Front Passenger Door 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 Front Passenger Door Module (FPDM), Front Passenger Door Module harness is open or shorted, Front Passenger 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: U1161 Buick indicates Lost Communications With Front Passenger Door Module.
Common causes: Common causes include Faulty Front Passenger Door Module (FPDM), Front Passenger Door Module harness is open or shorted, Front Passenger 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,143

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1161 Buick 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) U1161 is set.

OBDII Code U1161 Buick - Lost Communications With Front Passenger Door Module - AutoCodes.com — U1161 Buick Code - Lost Communications With Front Passenger Door Module

What does this mean?

What are the Possible Causes of the DTC U1161 Buick?

Faulty Front Passenger Door Module (FPDM)
Front Passenger Door Module harness is open or shorted
Front Passenger Door Module circuit poor electrical connection

How to Fix the DTC U1161 Buick?

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 U1161 Buick 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.

Need more information about the U1161 Buick code?

Need more information on how to fix the U1161 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1161 Buick code diagnosed by a professional: Find a repair shop in your area

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 U1161 Buick Code

1. What are common symptoms of OBDII code U1161 in a Buick related to the Front Passenger Door Module?

- Common symptoms include power window and door lock malfunctions, interior lights not working, and issues with the mirror controls on the front passenger side.

2. What are some potential causes of the U1161 code indicating lost communications with the Front Passenger Door Module in a Buick?

- Possible causes may include a faulty Front Passenger Door Module, damaged wiring or connectors, a blown fuse, or a problem with the vehicle's main control module.

3. How can I diagnose the U1161 code indicating lost communications with the Front Passenger Door Module in my Buick?

- Diagnosing the issue involves using a diagnostic scanner to retrieve the specific trouble code, checking the wiring and connectors for any visible damage, and testing the functionality of the Front Passenger Door Module.

4. Is it safe to continue driving my Buick with the U1161 code related to the Front Passenger Door Module issue?

- It is generally not recommended to drive the vehicle with this code, as it can affect important functions like power windows and door locks. It is best to address the problem promptly to ensure safety and functionality.

5. Can I repair the U1161 code indicating lost communications with the Front Passenger Door Module in my Buick myself?

- Depending on your experience and skill level, you may be able to repair the issue yourself by checking and repairing wiring connections, replacing the Front Passenger Door Module, or addressing any underlying electrical problems.

6. How much does it typically cost to repair the U1161 code related to the Front Passenger Door Module in a Buick?

- Repair costs can vary depending on the specific cause of the issue. It may range from a few hundred dollars for simple repairs like fixing wiring connections to over a thousand dollars if a module replacement is required.

7. Can a U1161 code related to the Front Passenger Door Module issue be a recurring problem in a Buick?

- If the underlying cause of the issue is not properly addressed, the U1161 code may reappear. It is important to thoroughly diagnose and repair the problem to prevent it from happening again.

8. Are there any preventive measures I can take to avoid the U1161 code indicating lost communications with the Front Passenger Door Module in my Buick?

- Regularly checking the condition of wiring and connectors, promptly addressing any issues with power windows or door locks, and ensuring proper maintenance can help prevent this code from appearing.

9. How long does it typically take to repair the U1161 code related to the Front Passenger Door Module issue in a Buick?

- The repair time can vary depending on the complexity of the problem and the availability of parts. Simple fixes may take a few hours, while more involved repairs could require a day or more.

10. Will resetting the OBDII code U1161 related to the Front Passenger Door Module in my Buick make the problem go away permanently?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code to appear. It is essential to diagnose and repair the problem to prevent it from recurring.