AutoCodes – GMC – U1151 GMC

U1151 GMC Code - Lost Communications With Vehicle Communication Interface 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 Vehicle Communication Interface Module (VCIM), Vehicle Communication Interface Module harness is open or shorted, Vehicle Communication Interface 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: U1151 GMC indicates Lost Communications With Vehicle Communication Interface Module.
Common causes: Common causes include Faulty Vehicle Communication Interface Module (VCIM), Vehicle Communication Interface Module harness is open or shorted, Vehicle Communication Interface 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 793

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 U1151 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) U1151 is set.

OBDII Code U1151 GMC - Lost Communications With Vehicle Communication Interface Module - AutoCodes.com — U1151 GMC Code - Lost Communications With Vehicle Communication Interface Module

What does this mean?

What are the Possible Causes of the DTC U1151 GMC?

Faulty Vehicle Communication Interface Module (VCIM)
Vehicle Communication Interface Module harness is open or shorted
Vehicle Communication Interface Module circuit poor electrical connection

How to Fix the DTC U1151 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 U1151 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 U1151 GMC Code

1. What are common symptoms of OBDII code U1151 GMC?

- Common symptoms include issues with the vehicle's communication system, such as loss of communication with the Vehicle Communication Interface Module (VCIM), malfunctioning infotainment system, and various warning lights on the dashboard.

2. What could cause the U1151 GMC trouble code to appear?

- The U1151 code is typically triggered by a communication failure between the vehicle's control modules and the VCIM, which can be caused by wiring issues, a faulty VCIM, or software glitches.

3. How can I diagnose the U1151 GMC code?

- Diagnosis usually involves checking the wiring connections to the VCIM, inspecting for any visible damage, and using a diagnostic scanner to communicate with the modules to pinpoint the source of the communication error.

4. Can I still drive my vehicle with the U1151 GMC trouble code?

- It is generally safe to drive the vehicle with the U1151 code, but it's recommended to address the underlying communication issue promptly to prevent further complications or potential malfunctions.

5. What are some repair tips for fixing the U1151 GMC code?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections to the VCIM, updating software if necessary, and resetting the trouble code with a diagnostic tool after making repairs.

6. Is it possible to reset the U1151 GMC trouble code without fixing the underlying issue?

- While it is possible to clear the trouble code temporarily, the underlying communication problem should be addressed to prevent the code from reappearing and ensure the vehicle's systems are functioning properly.

7. Can a DIY enthusiast fix the U1151 GMC trouble code at home?

- Depending on the cause of the communication issue, some DIY enthusiasts may be able to address the problem by checking connections, inspecting wiring, and performing basic repairs. However, more complex issues may require professional diagnosis and repair.

8. How much does it typically cost to repair the U1151 GMC trouble code?

- The cost of repairing the U1151 code can vary depending on the underlying cause of the communication problem, the need for replacement parts, and whether the repairs are done at a dealership or an independent repair shop. Costs can range from a simple fix to more expensive repairs.

9. Is the U1151 GMC trouble code specific to certain GMC vehicles?

- The U1151 code is a generic OBDII code related to communication issues with the VCIM and can appear in various GMC vehicles, as well as other makes and models that use similar communication systems.

10. How urgent is it to address the U1151 GMC trouble code?

- While the U1151 code may not pose an immediate danger to the vehicle's operation, it is important to address the underlying communication issue in a timely manner to prevent further complications and ensure the vehicle's systems are functioning correctly.