AutoCodes – Cadillac – C0291 Cadillac

C0291 Cadillac Code - Lost Communications With BCM

Quick Answer

The Body Control Module (BCM) sends a state of health serial data message to the Electronic Brake Control Module (EBCM) within 5.5 seconds after the ignition is turned ON. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) 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: C0291 Cadillac indicates Lost Communications With BCM.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) 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 1,058

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 Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0291 Cadillac Description

The Body Control Module (BCM) sends a state of health serial data message to the Electronic Brake Control Module (EBCM) within 5.5 seconds after the ignition is turned ON. The EBCM fails to receive serial data from the BCM.

OBDII Code C0291 Cadillac - Lost Communications With BCM - AutoCodes.com — C0291 Cadillac Code - Lost Communications With BCM

What does this mean?

What are the Possible Causes of the DTC C0291 Cadillac?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module (EBCM) harness is open or shorted
Electronic Brake Control Module (EBCM) circuit poor electrical connection

How to Fix the DTC C0291 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 C0291 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.

Need more information about the C0291 Cadillac code?

Need more information on how to fix the C0291 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0291 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 C0291 Cadillac Code

1. What are the common symptoms of OBDII code C0291 "Lost Communications With BCM" in a Cadillac?

Common symptoms include issues with power windows, door locks, interior lights, and other body control functions not working properly.

2. What are the possible causes of OBDII code C0291 in a Cadillac?

Possible causes may include a faulty Body Control Module (BCM), wiring issues, poor electrical connections, or a malfunctioning communication network.

3. How can I diagnose the underlying issue related to OBDII code C0291 in my Cadillac?

To diagnose the problem, you can use a diagnostic scan tool to retrieve the specific trouble codes, inspect the BCM and related components, check for loose or damaged wiring, and perform a network communication test.

4. Are there any DIY repair tips for fixing OBDII code C0291 in a Cadillac?

DIY repair tips may include checking and securing all electrical connections, inspecting the wiring harness for damage, and resetting the BCM by disconnecting the battery for a few minutes.

5. Can a failed BCM be repaired or does it need to be replaced when dealing with code C0291 in a Cadillac?

In most cases, a failed BCM will need to be replaced, as it is a complex electronic component that cannot be easily repaired.

6. How long does it typically take to repair OBDII code C0291 on a Cadillac?

The repair time can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a full day in some cases.

7. Is it safe to continue driving my Cadillac with OBDII code C0291 present?

It is not recommended to continue driving your Cadillac with this code present, as it can lead to further electrical issues and potentially affect the overall performance of your vehicle.

8. Will resetting the trouble codes make OBDII code C0291 disappear permanently?

Resetting the trouble codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

9. Can a mechanic help me fix OBDII code C0291 in my Cadillac, or is it a job I can do myself?

A mechanic with experience in diagnosing and repairing electrical issues in vehicles can help you fix OBDII code C0291. However, if you have the necessary tools and skills, you may be able to tackle the repair yourself.

10. How much does it cost to repair OBDII code C0291 in a Cadillac?

The cost of repairing OBDII code C0291 can vary depending on the cause of the issue, the labor rates in your area, and whether you choose to replace the BCM or opt for a different repair solution. It's recommended to get a few quotes from reputable mechanics to determine the cost.