AutoCodes – Chevrolet – C0291 Chevrolet

C0291 Chevrolet 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 Chevrolet 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 15,450

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 Chevrolet 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 Chevrolet - Lost Communications With BCM - AutoCodes.com — C0291 Chevrolet Code - Lost Communications With BCM

What does this mean?

What are the Possible Causes of the DTC C0291 Chevrolet?

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 Chevrolet?

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

Need Help with the Code?

Get the C0291 Chevrolet 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 Chevrolet Code

1. What are the common symptoms of OBDII code C0291 Chevrolet (Lost Communications With BCM)?

- Common symptoms include intermittent or complete loss of power windows, door locks, lighting controls, and other body control functions.

2. What are the possible causes of OBDII code C0291 Chevrolet?

- Possible causes include a faulty body control module (BCM), wiring issues, loose connections, or a malfunctioning communication network.

3. How can I diagnose the issue related to OBDII code C0291 Chevrolet?

- Diagnosis involves checking the wiring and connections related to the BCM, performing a BCM reset, and using a diagnostic scan tool to retrieve additional fault codes.

4. Can a DIY enthusiast repair OBDII code C0291 Chevrolet at home?

- Repairing this code may require advanced diagnostic tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

5. Is it safe to continue driving with OBDII code C0291 Chevrolet active?

- It is not recommended to drive with this code active, as it can affect critical vehicle functions controlled by the BCM, leading to potential safety hazards.

6. How much does it typically cost to repair OBDII code C0291 Chevrolet?

- The cost of repairing this code can vary depending on the underlying cause. It is advisable to get a diagnostic assessment from a qualified technician for an accurate estimate.

7. Can a low battery voltage trigger OBDII code C0291 Chevrolet?

- Yes, a weak or failing battery can cause communication issues and trigger the Lost Communications With BCM code. Ensure the battery is in good condition during diagnosis.

8. Are there any preventive measures to avoid OBDII code C0291 Chevrolet in the future?

- Regular vehicle maintenance, including checking and cleaning electrical connections, can help prevent communication issues that lead to this OBDII code.

9. Will resetting the BCM clear OBDII code C0291 Chevrolet?

- Resetting the BCM may temporarily clear the code, but it is crucial to address the underlying issue causing the communication loss to prevent the code from reoccurring.

10. How long does it typically take to repair OBDII code C0291 Chevrolet?

- The repair time for this code can vary based on the cause and complexity of the issue. Some repairs may be completed within a few hours, while others may take longer depending on the diagnosis.