AutoCodes – Buick – U1151 Buick

U1151 Buick 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 Buick 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 564

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 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) U1151 is set.

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

What does this mean?

What are the Possible Causes of the DTC U1151 Buick?

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 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 U1151 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.

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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 Buick Code

1. What does the OBDII code U1151 mean on a Buick?

The U1151 code indicates a loss of communication between the Vehicle Communication Interface Module (VCIM) and other control modules in the vehicle.

2. What are the common symptoms of the U1151 code in a Buick?

Symptoms may include warning lights on the dashboard, failure of OnStar or telematics systems, and possible communication issues with other modules.

3. What causes the U1151 code to appear on a Buick?

Common causes include a faulty VCIM, damaged wiring or connectors, a dead VCIM backup battery, or software-related issues in the control modules.

4. Can a dead OnStar backup battery cause the U1151 code?

Yes, a dead or failing OnStar backup battery can lead to communication issues and trigger the U1151 code.

5. How do you diagnose the U1151 code on a Buick?

Diagnosis involves checking the VCIM and associated wiring for damage, verifying module power and ground connections, and scanning for additional communication-related codes.

6. Can a software update fix the U1151 code in a Buick?

In some cases, a software update for the VCIM or related modules can resolve communication issues causing the U1151 code.

7. Is it safe to drive with the U1151 code active?

While the vehicle may still operate, features like OnStar and telematics may not function properly, and other communication-related issues could arise.

8. How much does it cost to repair the U1151 code on a Buick?

Repair costs can vary widely, ranging from $100 for simple wiring repairs to over $500 if the VCIM module needs replacement.

9. Can I reset the U1151 code without fixing the problem?

The code may temporarily clear with a scan tool, but it will likely return if the underlying issue isnâ€™t resolved.

10. When should I seek professional help for the U1151 code on my Buick?

If basic troubleshooting like checking fuses and connectors doesnâ€™t resolve the issue, itâ€™s best to consult a professional for advanced diagnostics.