AutoCodes – GMC – U1154 GMC

U1154 GMC Code - Lost Communications With Rear Seat Entertainment Assembly

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Seat Entertainment (RSE) Assembly, Rear Seat Entertainment Assembly harness is open or shorted, Rear Seat Entertainment Assembly 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: U1154 GMC indicates Lost Communications With Rear Seat Entertainment Assembly.
Common causes: Common causes include Faulty Rear Seat Entertainment (RSE) Assembly, Rear Seat Entertainment Assembly harness is open or shorted, Rear Seat Entertainment Assembly 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 713

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 U1154 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) U1154 is set.

OBDII Code U1154 GMC - Lost Communications With Rear Seat Entertainment Assembly - AutoCodes.com — U1154 GMC Code - Lost Communications With Rear Seat Entertainment Assembly

What does this mean?

What are the Possible Causes of the DTC U1154 GMC?

Faulty Rear Seat Entertainment (RSE) Assembly
Rear Seat Entertainment Assembly harness is open or shorted
Rear Seat Entertainment Assembly circuit poor electrical connection

How to Fix the DTC U1154 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 U1154 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 U1154 GMC Code

1. What does the OBDII code U1154 mean for a GMC vehicle?

U1154 indicates a loss of communication between the main vehicle control modules and the rear seat entertainment assembly.

2. What are the common symptoms of the U1154 code in a GMC?

Symptoms may include the rear seat entertainment system not working, intermittent functionality, or a warning light on the dashboard.

3. What causes the U1154 code to trigger in a GMC?

Common causes include faulty wiring or connectors, a malfunctioning rear seat entertainment assembly, or issues with the communication network.

4. Can a blown fuse cause the U1154 code in a GMC?

Yes, a blown fuse related to the rear seat entertainment system or communication circuits can trigger this code.

5. How do I diagnose the U1154 code in my GMC?

Start by checking the wiring and connectors for the rear seat entertainment system, inspect relevant fuses, and use a scan tool to verify communication between modules.

6. Is the U1154 code specific to GMC vehicles with rear seat entertainment systems?

Yes, this code is specific to vehicles equipped with a rear seat entertainment system and indicates a communication issue with that assembly.

7. Can I still drive my GMC with the U1154 code?

Yes, the vehicle is typically drivable, but the rear seat entertainment system may not function until the issue is resolved.

8. How do I fix the U1154 code on my GMC?

Repairs may include checking and repairing any damaged wiring or connectors, replacing a faulty rear seat entertainment assembly, or addressing any network communication issues.

9. Could a software update resolve the U1154 code in a GMC?

In some cases, a software update for the vehicle's control modules may resolve communication issues causing the U1154 code.

10. Do I need to replace the rear seat entertainment system to fix the U1154 code?

Not always. The issue could be with the wiring, connectors, or the communication network rather than the entertainment system itself. Proper diagnosis is essential.