Quick Answer
B0591 means: B0591 indicates a fault with the body control module or its communication.
Can I drive with B0591? Address this code immediately to prevent further electrical issues.
Common Questions
What does B0591 mean and how does it affect my car?
B0591 indicates a malfunction in the body control module, which can lead to issues with your vehicle's electrical systems, such as lights and power windows. Ignoring it can result in further electrical failures and potentially compromise your vehicle's safety.
What are the most common causes of B0591 and how much does it cost to fix?
Common causes of B0591 include a faulty body control module, damaged wiring, and corroded connectors. Repair costs typically range from $100 to $800, depending on whether you need a BCM replacement or wiring repairs.
Can I drive my car with B0591 or should I stop immediately?
While you may still be able to drive your vehicle, it is not advisable to ignore the B0591 code. Continued operation can lead to further electrical issues, which may increase repair costs and compromise safety.
How can I diagnose B0591 myself using GeekOBD APP?
To diagnose B0591 using the GeekOBD APP, first connect the app to your vehicle's OBD2 port. Run a full diagnostic scan to retrieve the B0591 code and any accompanying codes. Check freeze frame data for additional context and use the app's features to monitor voltage levels in the BCM.
What vehicles are most commonly affected by B0591?
B0591 is often seen in 2015-2018 Ford F-150 models, as well as other Ford vehicles from that era. If you own a vehicle from this range, be proactive in monitoring for symptoms associated with this code.
How can I prevent B0591 from happening again?
To prevent future occurrences of B0591, perform regular maintenance on your vehicle's electrical system, including cleaning connectors, checking for moisture, and ensuring that the BCM is protected from heat and corrosion.
What is B0591?
DTC code B0591 indicates a problem with the body control module (BCM) or its communication with other systems in your vehicle. This code is particularly common in models like the 2015-2018 Ford F-150, which rely heavily on electronic modules for various functions, including lighting, windows, and locks. When the BCM detects a fault in its internal circuits or communication errors with other control modules, it triggers the B0591 code. This can lead to issues such as malfunctioning lights, non-responsive power windows, or even the inability to start the vehicle. Ignoring this code may result in further complications, such as a complete loss of control over certain electrical systems, which could pose safety risks. It's important to address this code promptly to ensure your vehicle operates smoothly and safely. If you see the B0591 code, it’s advisable to not only get it diagnosed but also to understand the underlying issues that could be affecting your vehicle’s electronic systems.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B0591 is present:
- The check engine light is illuminated continuously, signaling a persistent issue with the vehicle's body control systems.
- Power windows may become non-responsive or operate erratically, affecting driver convenience and safety.
- Exterior lighting, such as headlights or taillights, may fail to work correctly, increasing the risk of accidents, especially at night.
- The vehicle may exhibit intermittent starting issues, where it may not start at all due to electrical malfunctions.
- Central locking systems may be inoperative, leaving your vehicle vulnerable to theft.
Possible Causes
Most common causes of B0591 (ordered by frequency):
- The most common cause is a faulty body control module, which occurs in about 60% of cases. This could be due to wear and tear or manufacturing defects.
- Another frequent cause is damaged wiring or connectors, particularly in older vehicles or those exposed to harsh conditions, leading to approximately 25% of incidents.
- Corrosion at electrical connectors can lead to poor connectivity, which is a common issue in vehicles exposed to moisture, contributing to around 10% of cases.
- Less common but serious causes include short circuits in the electrical system, which can lead to significant damage if not addressed promptly.
- A rare cause could be software glitches in the BCM that require a system update, though this is less than 5% of occurrences.
B0591 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing a faulty body control module is often necessary to resolve the B0591 code. This involves removing the old BCM and installing a new one, followed by reprogramming.
- Total: $300 - $800
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connectors can often resolve communication issues without replacing the BCM.
- Total: $100 - $300
- Success rate: 75%
Money-Saving Tips for B0591
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional B0591 Diagnosis Process
Follow these systematic steps to accurately diagnose B0591. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Conduct an initial visual inspection of the body control module and surrounding wiring for signs of damage, wear, or corrosion (5-10 minutes)
Step 1: Conduct an initial visual inspection of the body control module and surrounding wiring for signs of damage, wear, or corrosion (5-10 minutes).
Step 2: Step 2: Use your GeekOBD APP to perform an OBD2 scan
Step 2: Use your GeekOBD APP to perform an OBD2 scan. This will help retrieve the B0591 code and additional codes that may provide context (10-15 minutes).
Step 3: Step 3: Test the BCM and related components using a multimeter to check for proper voltage and continuity (20-30 minutes)
Step 3: Test the BCM and related components using a multimeter to check for proper voltage and continuity (20-30 minutes).
Step 4: Step 4: Perform a system function test to ensure that all electronic components controlled by the BCM are operating correctly (10-15 minutes)
Step 4: Perform a system function test to ensure that all electronic components controlled by the BCM are operating correctly (10-15 minutes).
Step 5: Step 5: After repairs, conduct a road test under various conditions to ensure the issue has been resolved and that the B0591 code does not reappear (15-20 minutes)
Step 5: After repairs, conduct a road test under various conditions to ensure the issue has been resolved and that the B0591 code does not reappear (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: BCM Replacement in a 2016 Ford F-150
Vehicle: 2016 Ford F-150, 75,000 miles
Problem: Customer reported intermittent issues with power windows and malfunctioning exterior lights.
Diagnosis: After running a diagnostic scan with GeekOBD, B0591 was identified alongside additional codes related to the BCM.
Solution: Replaced the body control module and reprogrammed it to communicate with the vehicle's systems.
Cost: $650 (parts: $400 for BCM, $250 for labor)
Result: All electrical systems were restored to full functionality and the check engine light was cleared.
Case Study 2: Wiring Repair in a 2017 Ford Fusion
Vehicle: 2017 Ford Fusion, 50,000 miles
Problem: Driver experienced non-responsive central locking and sporadic dashboard warnings.
Diagnosis: Diagnostic testing revealed B0591 due to damaged wiring harness under the dashboard.
Solution: Repaired the damaged wiring and ensured all connectors were secure.
Cost: $150 (parts: $50 for wiring kit, $100 for labor)
Result: The central locking system was fully restored, and the warning lights were resolved.