AutoCodes – GMC – U1161 GMC

U1161 GMC 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 GMC 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.

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Code Popularity 1,625

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

What does this mean?

What are the Possible Causes of the DTC U1161 GMC?

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 GMC?

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 GMC 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 U1161 GMC Code

1. What are the common symptoms of OBDII code U1161 GMC?

- Common symptoms include power door lock issues, window control problems, and interior lights not functioning properly on the front passenger side.

2. What are the possible causes of the U1161 GMC code?

- The code can be triggered by a faulty front passenger door module, damaged wiring or connectors, or communication issues within the vehicle's network.

3. How can I diagnose the U1161 code related to the front passenger door module?

- Diagnosis involves checking the wiring and connectors for damage, testing the front passenger door module for proper function, and using a scan tool to identify communication faults.

4. Can a DIY enthusiast repair the U1161 code related to the front passenger door module?

- While some basic troubleshooting like checking for loose connections can be done by DIYers, complex repairs involving module replacement or network diagnosis may require professional help.

5. Are there any temporary fixes for the U1161 GMC code until I can get it repaired?

- Disconnecting the vehicle's battery for a few minutes can sometimes reset the communication system and temporarily clear the code, but this is not a permanent solution.

6. Will driving with the U1161 code affect the vehicle's performance or safety?

- While the code itself may not directly impact performance or safety, unresolved communication issues can lead to further electrical problems in the vehicle.

7. How much does it typically cost to repair the U1161 GMC code related to the front passenger door module?

- Repair costs can vary depending on the exact cause of the code, but it may involve replacing the front passenger door module, which can range from $200 to $500 including parts and labor.

8. Can a U1161 code be triggered by a simple fuse issue?

- While rare, a blown fuse related to the front passenger door module can potentially trigger the U1161 code, so it's worth checking the fuses as part of the diagnosis.

9. Is it safe to continue driving my vehicle with the U1161 GMC code present?

- It's generally safe to drive the vehicle with the code, but it's recommended to address the issue promptly to prevent any further electrical malfunctions in the future.

10. How long does it take to repair the U1161 code related to the front passenger door module?

- The repair time can vary depending on the exact cause of the code and the availability of parts, but it typically takes a few hours to a day for a mechanic to diagnose and fix the issue.