AutoCodes – GMC – U1176 GMC

U1176 GMC Code - Loss Of Remote Function Actuator Communications

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Remote Function Actuator (RFA), Remote Function Actuator harness is open or shorted, Remote Function Actuator 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: U1176 GMC indicates Loss Of Remote Function Actuator Communications.
Common causes: Common causes include Faulty Remote Function Actuator (RFA), Remote Function Actuator harness is open or shorted, Remote Function Actuator 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 956

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1176 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) U1176 is set.

OBDII Code U1176 GMC - Loss Of Remote Function Actuator Communications - AutoCodes.com — U1176 GMC Code - Loss Of Remote Function Actuator Communications

What does this mean?

What are the Possible Causes of the DTC U1176 GMC?

Faulty Remote Function Actuator (RFA)
Remote Function Actuator harness is open or shorted
Remote Function Actuator circuit poor electrical connection

How to Fix the DTC U1176 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 U1176 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 U1176 GMC Code

1. What are the common symptoms of OBDII code U1176 GMC?

Symptoms may include loss of remote keyless entry function, difficulty locking or unlocking doors remotely, and issues with the actuator communications system.

2. What typically causes the U1176 GMC code to appear?

The code usually indicates a communication problem between the remote keyless entry module and the door lock actuator, possibly due to wiring issues, a faulty module, or a malfunctioning actuator.

3. How can I diagnose the source of the U1176 GMC code?

Diagnosis often involves checking the wiring connections between the module and actuator, testing the components for proper functionality, and using a diagnostic scanner to retrieve specific error codes.

4. Can I repair the U1176 GMC code issue myself?

If you have experience with automotive electrical systems, you may be able to troubleshoot and repair the issue yourself by inspecting wiring, testing components, and replacing any faulty parts.

5. Is it safe to continue driving with the U1176 GMC code present?

While the vehicle may still be operable with this code, it's important to address the underlying issue promptly to avoid potential security and convenience issues associated with the remote function actuator communications.

6. How much does it typically cost to repair the U1176 GMC code?

The cost of repair can vary depending on the specific cause of the issue and whether you choose to address it yourself or seek professional assistance. Costs may range from a few dollars for simple fixes to a few hundred dollars for more complex repairs.

7. Are there any temporary solutions for the U1176 GMC code?

In some cases, resetting the remote keyless entry system or reprogramming the key fob may temporarily resolve the communication issue, but a permanent fix will likely require more in-depth diagnostics and repairs.

8. Can extreme weather conditions trigger the U1176 GMC code?

Yes, extreme temperatures or moisture exposure can sometimes affect the communication between the keyless entry module and the door lock actuator, leading to the appearance of the U1176 code.

9. How long does it typically take to repair the U1176 GMC code?

The repair process can vary in duration depending on the complexity of the issue and the availability of parts. Simple fixes may be completed within an hour, while more involved repairs could take several hours or longer.

10. Will fixing the U1176 GMC code require a visit to a dealership or can a local mechanic handle it?

A local mechanic with experience in automotive electrical systems should be able to diagnose and repair the U1176 code. However, if specialized equipment or programming is needed, a dealership may be the best option for resolving the issue.