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Engine-Codes – Generic – C0291

C0291 Code - Lost Communications With BCM

Quick Answer

The C0291 diagnostic trouble code (DTC) refers to "Lost Communications With BCM," which means that the communication between the Body Control Module (BCM) and other control modules in the vehicle has been interrupted or lost. Common causes include Corroded or loose wiring connections, Faulty BCM or control module, Software glitches in the vehicle's electronic systems. 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 indicates Lost Communications With BCM.
Common causes
Common causes include Corroded or loose wiring connections, Faulty BCM or control module, Software glitches in the vehicle's electronic systems.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code C0291 Description

The C0291 diagnostic trouble code (DTC) refers to "Lost Communications With BCM," which means that the communication between the Body Control Module (BCM) and other control modules in the vehicle has been interrupted or lost. The BCM is a crucial component responsible for controlling various electronic functions in the vehicle, such as power windows, door locks, lighting, and other convenience features. When communication with the BCM is disrupted, it can lead to malfunctions in these systems and affect the overall performance of the vehicle.

OBDII Code C0291 - Lost Communications With BCM
C0291 Code - Lost Communications With BCM

Common Causes of C0291

  1. Corroded or loose wiring connections
  2. Faulty BCM or control module
  3. Software glitches in the vehicle's electronic systems
  4. Water intrusion or moisture affecting the BCM
  5. Electrical issues in the vehicle's network communication system

Symptoms of C0291

  1. Power windows not working properly
  2. Door locks malfunctioning
  3. Interior lights not functioning as expected
  4. Issues with remote keyless entry system
  5. Warning lights on the dashboard (such as ABS, traction control, or airbag lights)

How to Fix C0291

  1. Perform a thorough inspection of wiring connections and repair any corroded or loose connections.
  2. Check for software updates for the BCM and control modules and perform the necessary reprogramming.
  3. Test the BCM and control modules for functionality and replace any faulty components.
  4. Ensure proper sealing to prevent water intrusion and moisture affecting the BCM.
  5. Clear the DTC and perform a complete system reset to ensure proper communication between modules.

Cost to Fix C0291

The typical repair costs for addressing a "Lost Communications With BCM" issue can range from $200 to $600, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more accurate estimate.

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Code C0291 Information for Specific Makes

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 Code

1. What does OBDII code C0291 mean?

C0291 indicates a loss of communication between the Body Control Module (BCM) and other control modules in the vehicle.

2. What are common symptoms of code C0291?

Symptoms may include a non-functional dashboard, intermittent electrical issues, warning lights on the instrument cluster, or problems with vehicle accessories like locks or wipers.

3. What causes code C0291 to appear?

The most common causes are faulty BCM wiring, a defective BCM, issues with the CAN (Controller Area Network) bus system, or low battery voltage.

4. Can a weak battery cause C0291?

Yes, a weak or failing battery can disrupt communication between modules and trigger this code.

5. How do you diagnose code C0291?

Diagnosis typically involves checking the BCM wiring and connectors, testing the vehicle’s CAN bus network, verifying battery voltage, and scanning for related codes.

6. Can you drive with code C0291?

While the vehicle may still be drivable, unresolved communication issues can lead to other electrical malfunctions and safety concerns.

7. How is code C0291 repaired?

Common repairs include fixing or replacing damaged wiring, updating or reprogramming the BCM, or replacing the BCM if it is faulty.

8. Is reprogramming required after replacing the BCM for code C0291?

Yes, most BCM replacements require reprogramming to sync with the vehicle's systems.

9. Can a blown fuse cause code C0291?

Yes, a blown fuse in the BCM circuit can interrupt communication and trigger this code.

10. How much does it cost to fix code C0291?

Repair costs can range from $100 to $1,000 or more, depending on whether the issue is a simple wiring repair or a complete BCM replacement.

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