AutoCodes – Cadillac – U1151 Cadillac

U1151 Cadillac 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 Cadillac 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 764

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

What does this mean?

What are the Possible Causes of the DTC U1151 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U1151 in a Cadillac?

The common symptoms of U1151 code include issues with the vehicle's communication systems, such as loss of communication with the Vehicle Communication Interface Module (VCIM), malfunctioning infotainment system, or erratic behavior of electronic components.

2. What are the possible causes of OBDII code U1151 in a Cadillac?

Possible causes of U1151 code in a Cadillac may include a faulty VCIM module, damaged wiring or connections to the VCIM, software glitches, or a malfunctioning CAN bus network.

3. How can I diagnose OBDII code U1151 in my Cadillac?

Diagnosing U1151 code usually involves using an OBDII scanner to retrieve the code and checking the VCIM module, inspecting the wiring and connections, and testing the CAN bus network for any faults.

4. Can I still drive my Cadillac with OBDII code U1151 present?

It is not recommended to drive your Cadillac with the U1151 code present, as it may lead to further communication issues and potential malfunctioning of vital vehicle systems.

5. How can I repair OBDII code U1151 in my Cadillac?

Repairing U1151 code in a Cadillac may involve replacing the faulty VCIM module, repairing damaged wiring or connections, updating software if necessary, and ensuring proper communication within the CAN bus network.

6. Will resetting the OBDII code U1151 in my Cadillac solve the issue?

Resetting the code may temporarily clear the error, but it is important to diagnose and address the root cause to prevent the code from reappearing and causing further communication problems.

7. Can a DIY enthusiast fix OBDII code U1151 in a Cadillac?

While some basic checks and repairs can be done by a DIY enthusiast, diagnosing and repairing U1151 code may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

8. How much does it cost to repair OBDII code U1151 in a Cadillac?

The cost of repairing U1151 code can vary depending on the underlying issue, the need for parts replacement, and labor costs. It is advisable to get a diagnostic from a mechanic to determine the exact cost.

9. Is OBDII code U1151 a common issue in Cadillacs?

U1151 code related to lost communication with the VCIM module is not uncommon in Cadillacs, especially in vehicles with advanced communication and infotainment systems.

10. Can OBDII code U1151 cause other problems in my Cadillac if left unrepaired?

If left unrepaired, OBDII code U1151 can lead to further communication issues with various vehicle systems, affecting the overall performance and safety of your Cadillac. It is essential to address the problem promptly.