Quick Answer
U0591 means: U0591 indicates a communication failure between the Body Control Module and other vehicle systems.
Can I drive with U0591? Immediate attention is recommended to prevent further electrical issues.
Common Questions
What does U0591 mean and how does it affect my car?
The U0591 code indicates a communication failure within your vehicle, particularly between the Body Control Module and other electronic systems. This can lead to issues such as unresponsive dashboard lights, failures in the keyless entry system, and potential safety concerns if critical systems don’t operate correctly. Addressing this code promptly is essential to maintain vehicle reliability.
What are the most common causes of U0591 and how much does it cost to fix?
Common causes of U0591 include a faulty Body Control Module (BCM), with repair costs ranging from $300 to $800 for replacement. Wiring issues can also lead to this code, typically costing between $100 and $300 to repair. Identifying the specific cause is crucial for an effective repair.
Can I drive my car with U0591 or should I stop immediately?
While it may be possible to drive your vehicle with the U0591 code, doing so could lead to further electronic issues and safety risks. It’s advisable to address the problem as soon as possible to avoid complications.
How can I diagnose U0591 myself using GeekOBD APP?
To diagnose U0591 using the GeekOBD APP, first connect the device to your vehicle's OBD2 port. Run a full scan to retrieve diagnostic trouble codes, including U0591. Analyze any freeze frame data available to understand the context of the fault, and check for any related codes that may provide additional insights.
What vehicles are most commonly affected by U0591?
The U0591 code is frequently seen in vehicles such as the 2015-2020 Ford Explorer, as well as other Ford models from that era. It's important to check for any manufacturer recalls or technical service bulletins (TSBs) related to the BCM for your specific model.
How can I prevent U0591 from happening again?
To prevent the U0591 code from recurring, regularly inspect and maintain your vehicle's wiring and connectors, especially in areas prone to moisture or wear. Keeping the vehicle's software updated can also help prevent glitches that may lead to communication errors.
What is U0591?
DTC U0591 refers to a communication issue within a vehicle's network, specifically indicating that the Body Control Module (BCM) is unable to communicate with other modules. This code often arises from issues in the vehicle's data link connector, faulty wiring, or a malfunctioning BCM itself. When this code appears, it can lead to various operational problems, such as malfunctioning dashboard lights, issues with keyless entry, and even problems with engine control. For instance, in vehicles like the 2015-2020 Ford Explorer, owners may notice that their door locks become unresponsive or that the interior lights fail to operate correctly. In some cases, this can affect overall vehicle performance and safety, as critical systems may not receive the necessary signals to function properly. Car owners should take this code seriously as it signifies a breakdown in communication within the vehicle's electronic systems, which could lead to further complications if not addressed promptly.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0591 is present:
- The check engine light illuminates, often remaining on until the issue is resolved.
- Keyless entry system fails to unlock or lock the vehicle, leading to inconvenience.
- Dashboard lights flicker or do not respond, indicating potential electrical issues.
- Interior lights may not turn on or stay on, affecting visibility inside the vehicle.
- Various electronic components, such as power windows or mirrors, may operate erratically.
Possible Causes
Most common causes of U0591 (ordered by frequency):
- Faulty Body Control Module (BCM) - 40% likelihood: The BCM may be malfunctioning due to wear or internal faults.
- Wiring issues - 30% likelihood: Damaged, corroded, or loose wiring in the communication lines can interrupt signals.
- Poor connections - 20% likelihood: Loose or corroded connectors at the BCM and other modules can lead to communication failures.
- Software glitches - 5% likelihood: Outdated or faulty software in the BCM can cause temporary communication problems.
- Environmental factors - 5% likelihood: Exposure to moisture or extreme temperatures may affect the BCM's performance.
U0591 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing the faulty Body Control Module with a new OEM part.
- Total: $300 - $800
- Success rate: 90%
Wiring Repair
Repairing or replacing damaged wiring and connectors in the communication circuit.
- Total: $100 - $300
- Success rate: 85%
Money-Saving Tips for U0591
- 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 U0591 Diagnosis Process
Follow these systematic steps to accurately diagnose U0591. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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 2018 Ford Explorer
Vehicle: 2018 Ford Explorer, 45,000 miles
Problem: Customer reported keyless entry failure and flickering dashboard lights.
Diagnosis: OBD scan revealed U0591 and a thorough inspection showed a faulty Body Control Module.
Solution: Replaced the BCM and reprogrammed the system.
Cost: $600 (parts: $400 for BCM, $200 for labor)
Result: Issue resolved, and all systems operated normally post-repair.
Case Study 2: Wiring Repair in a 2016 Ford Fusion
Vehicle: 2016 Ford Fusion, 55,000 miles
Problem: Customer experienced intermittent dashboard light failures.
Diagnosis: Found damaged wiring in the connector to the BCM after performing a visual inspection.
Solution: Repaired the damaged wiring and ensured all connections were secure.
Cost: $150 (parts: $50 for wiring, $100 for labor)
Result: Dashboard lights functioned correctly after repair, and no further issues were reported.