AutoCodes – Generic – U1151

U1151 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 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 6,428

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

What does this mean?

What are the Possible Causes of the DTC U1151?

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?

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 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.

Need more information about the U1151 code?

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Information for Specific Makes

U1151 Buick — Lost Communications With Vehicle Communication Interface Module
U1151 Cadillac — Lost Communications With Vehicle Communication Interface Module
U1151 Chevrolet — Lost Communications With Vehicle Communication Interface Module
U1151 GMC — Lost Communications With Vehicle Communication Interface Module
U1151 Pontiac — Lost Communications With Vehicle Communication Interface Module

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 Code

1. What does OBDII code U1151 mean?

Code U1151 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 code U1151?

Symptoms may include warning lights on the dashboard (e.g., ABS or traction control), intermittent communication issues, or certain features like OnStar not functioning.

3. What causes code U1151 to appear?

Common causes include a faulty VCIM, damaged wiring or connectors, low battery voltage, or software issues in the vehicle's control modules.

4. Can a weak battery trigger code U1151?

Yes, a weak or failing battery can cause communication disruptions and trigger this code.

5. How do you diagnose code U1151?

Diagnosis involves checking the VCIM for faults, inspecting wiring and connectors for damage, ensuring proper voltage levels, and verifying module communication with a scan tool.

6. Is code U1151 a serious issue?

It depends on the symptoms. While the code itself may not affect drivability, it can indicate potential issues with vehicle communication that may lead to further problems.

7. Can a software update fix code U1151?

In some cases, updating the VCIM or related control modules' software may resolve communication issues associated with this code.

8. How much does it cost to repair code U1151?

Repair costs vary widely but may range from $50 for simple fixes like connector cleaning to over $500 if the VCIM needs replacement.

9. Can I still drive my car with code U1151 active?

You can usually drive with this code active, but some features like OnStar or advanced driver assistance systems may not work properly.

10. How can I prevent code U1151 from occurring?

Regularly inspect and maintain the vehicle's electrical system, ensure the battery is in good condition, and address any wiring issues promptly to reduce the chances of this code appearing.