Quick Answer
B0390 means: B0390 indicates a malfunction in the air suspension control module or circuit.
Can I drive with B0390? Immediate attention recommended to avoid further damage.
Common Questions
What does B0390 mean and how does it affect my car?
DTC B0390 indicates a malfunction in the air suspension system, which can lead to a rough ride, sagging, and handling issues. If ignored, it may cause more severe mechanical problems that could be costly to fix.
What are the most common causes of B0390 and how much does it cost to fix?
Common causes include a faulty air suspension control module and damaged wiring. Repair costs can range from $150 for wiring repairs to $800 for module replacement.
Can I drive my car with B0390 or should I stop immediately?
While you can drive with B0390, it’s not recommended as it may affect handling and safety. It's best to address the issue promptly to avoid further damage.
How can I diagnose B0390 myself using GeekOBD APP?
Using the GeekOBD APP, perform an OBD2 scan to retrieve codes. Look for B0390 and review freeze frame data to understand when the code was triggered.
What vehicles are most commonly affected by B0390?
This code is often found in 2015-2020 Ford F-150 models, especially those equipped with the optional air suspension system.
How can I prevent B0390 from happening again?
Regularly inspect and maintain your air suspension system according to your vehicle's service schedule to prevent issues from arising.
What is B0390?
DTC B0390 refers to a problem with the rear air suspension system, specifically indicating an issue with the suspension control module or its circuit. This code is common in vehicles equipped with an air suspension system, such as the 2015-2020 Ford F-150. When the B0390 code triggers, it typically means that the system has detected a fault that prevents the air suspension from functioning properly. This could lead to a decrease in ride quality, handling issues, and in some cases, the vehicle may not be able to maintain its intended ride height. In practical terms, you may notice that your truck feels bouncier than usual or that it sags when loaded. Ignoring this code can lead to more severe mechanical problems, possibly resulting in costly repairs down the line. Therefore, addressing the B0390 code promptly is advisable to ensure your vehicle remains safe and comfortable to drive.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B0390 is present:
- The check engine light illuminates, remaining on continuously, indicating there’s an issue with the vehicle's air suspension.
- You may experience a rougher ride, feeling every bump and dip in the road more acutely than before.
- The vehicle may sag noticeably in the rear, especially when loaded, which can affect handling and safety.
- During acceleration, you might notice that the truck doesn't handle as well, potentially leading to swaying or instability.
- Fuel economy may decrease by 5-10% due to the improper alignment and suspension issues.
Possible Causes
Most common causes of B0390 (ordered by frequency):
- The most common cause of the B0390 code is a faulty air suspension control module, which can occur in about 60% of cases. This module is responsible for regulating the air pressure in the suspension system.
- A second common cause is damaged wiring or connectors in the air suspension circuit. These can wear out over time or be damaged during regular vehicle use.
- Improper maintenance of the air suspension system, such as failing to replace air struts at recommended intervals, can also lead to this code appearing.
- In rare cases, a leak in the air suspension system can trigger the B0390 code. This could be due to a damaged air spring or hose.
- Lastly, software issues within the vehicle's control module, although less common, can lead to false readings that trigger the B0390 code.
B0390 Repair Costs
Cost Breakdown by Repair Type
Air Suspension Control Module Replacement
Replacing the faulty air suspension control module with a new OEM part.
- Total: $400 - $800
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring or connectors in the suspension circuit.
- Total: $150 - $300
- Success rate: 75%
Complete Air Suspension System Inspection
Comprehensive inspection to identify all potential issues within the air suspension system.
- Total: $100 - $150
- Success rate: 90%
Money-Saving Tips for B0390
- 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 B0390 Diagnosis Process
Follow these systematic steps to accurately diagnose B0390. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Begin with an initial visual inspection of the air suspension system for any obvious signs of damage, such as frayed wires or leaks in air lines (5-10 minutes)
Step 1: Begin with an initial visual inspection of the air suspension system for any obvious signs of damage, such as frayed wires or leaks in air lines (5-10 minutes).
Step 2: Step 2: Utilize the GeekOBD APP to perform an OBD2 scan, retrieving all stored codes and freeze frame data for a better understanding of the fault context (10-15 minutes)
Step 2: Utilize the GeekOBD APP to perform an OBD2 scan, retrieving all stored codes and freeze frame data for a better understanding of the fault context (10-15 minutes).
Step 3: Step 3: Conduct thorough component testing using a multimeter to check the voltage and ground signals to the air suspension control module (20-30 minutes)
Step 3: Conduct thorough component testing using a multimeter to check the voltage and ground signals to the air suspension control module (20-30 minutes).
Step 4: Step 4: After repairs, perform a system function test to ensure that the air suspension is working correctly and clear any fault codes from the system (10-15 minutes)
Step 4: After repairs, perform a system function test to ensure that the air suspension is working correctly and clear any fault codes from the system (10-15 minutes).
Step 5: Step 5: Finally, take your vehicle for a road test under various conditions to confirm the effectiveness of the repairs (15-20 minutes)
Step 5: Finally, take your vehicle for a road test under various conditions to confirm the effectiveness of the repairs (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: B0390 Code in a 2017 Ford F-150
Vehicle: 2017 Ford F-150 Lariat, 60,000 miles
Problem: Customer reported a rough ride and a sagging rear end.
Diagnosis: Diagnostic scan revealed B0390. Visual inspection showed damaged wiring to the control module.
Solution: Replaced the damaged wiring and the air suspension control module.
Cost: $750 (Parts: $500, Labor: $250)
Result: Ride quality improved significantly; check engine light cleared.
Case Study 2: B0390 Code in a 2018 Ford F-150
Vehicle: 2018 Ford F-150 Platinum, 45,000 miles
Problem: Customer noticed the check engine light was on, and the rear suspension was sagging.
Diagnosis: OBD2 scan confirmed B0390. Further testing showed a malfunctioning air suspension control module.
Solution: Replaced the air suspension control module with an OEM part.
Cost: $650 (Parts: $400, Labor: $250)
Result: Vehicle returned to normal operation with no further issues noted.