C0291 Buick 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 Buick 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.
Code C0291 Buick Description
What are the Possible Causes of the DTC C0291 Buick?
- 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 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 C0291 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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Frequently Asked Questions about C0291 Buick Code
1. What does the OBDII code C0291 mean for a Buick?
The code C0291 indicates a loss of communication between the Body Control Module (BCM) and other vehicle systems or control modules.
2. What are common symptoms of the C0291 code on a Buick?
Symptoms may include warning lights on the dashboard, intermittent electrical issues, problems with door locks or windows, and non-functional accessories.
3. What causes the C0291 code to appear on a Buick?
Common causes include faulty wiring or connectors, a failing BCM, low battery voltage, or issues with the vehicle’s communication network.
4. Can a weak battery trigger the C0291 code on a Buick?
Yes, a weak or failing battery can cause communication issues and lead to the C0291 code being stored.
5. How do you diagnose the C0291 code on a Buick?
Diagnosis involves checking for loose or damaged wiring, testing the BCM for faults, inspecting connectors for corrosion, and ensuring the battery and alternator are functioning correctly.
6. Is it safe to drive with the C0291 code on a Buick?
While the car may still operate, the code indicates a communication issue that could affect important systems. It’s best to address the problem promptly.
7. Can a software update fix the C0291 code on a Buick?
In some cases, reprogramming or updating the BCM software may resolve communication issues if the problem is software-related.
8. How much does it cost to repair the C0291 code on a Buick?
Repair costs vary depending on the cause, but diagnosing and fixing wiring or connector issues may cost $100–$300, while BCM replacement can cost $400–$1,000 or more.
9. Can I clear the C0291 code without repairing the issue?
While the code can be cleared temporarily with a scan tool, it will return if the underlying problem is not resolved.
10. What tools are needed to troubleshoot the C0291 code on a Buick?
A diagnostic scan tool, a multimeter for testing electrical connections, and access to the vehicle’s wiring diagrams are essential for troubleshooting this code.
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