C0291 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 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 Description
What are the Possible Causes of the DTC C0291?
- 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?
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 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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Information for Specific Makes
- C0291 Buick — Lost Communications With BCM
- C0291 Cadillac — Lost Communications With BCM
- C0291 Chevrolet — Lost Communications With BCM
- C0291 GMC — Lost Communications With BCM
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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