Quick Answer
U0B90 means: U0B90 indicates a communication failure within vehicle electronics.
Can I drive with U0B90? Immediate attention is recommended to prevent further electrical issues.
Common Questions
What does U0B90 mean and how does it affect my car?
The U0B90 code indicates a communication failure within your vehicle's electronic systems. This can lead to various electrical issues, such as malfunctions in lights, windows, and even the starting system. If ignored, it can lead to more significant problems, affecting overall vehicle performance and safety.
What are the most common causes of U0B90 and how much does it cost to fix?
Common causes include damaged wiring, software issues, and water ingress. Repair costs can range from $100 for simple wiring repairs to $800 for BCM replacement, depending on the issue's severity and complexity.
Can I drive my car with U0B90 or should I stop immediately?
It is advisable not to drive your vehicle if you see the U0B90 code, as it indicates potential electrical failures that could lead to safety risks or further damage to your vehicle's systems.
How can I diagnose U0B90 myself using GeekOBD APP?
To diagnose U0B90, use the GeekOBD APP to scan for codes and view freeze frame data. Look for patterns in symptoms and check for related codes that might give more context to the problem.
What vehicles are most commonly affected by U0B90?
Vehicles like the 2017-2022 Ford Fusion and 2018-2022 Jeep Wrangler frequently encounter U0B90. Be aware of any recalls or technical service bulletins related to the BCM in these models.
How can I prevent U0B90 from happening again?
Regular maintenance checks on your vehicle's electrical systems, ensuring connectors are clean and free from moisture, can help prevent U0B90 from recurring. Additionally, consider using a diagnostic tool like the GeekOBD APP periodically to catch issues early.
What is U0B90?
The diagnostic trouble code (DTC) U0B90 indicates a communication issue within the vehicle's network, specifically related to the body control module (BCM) or other control modules. In simpler terms, this code signifies that one or more of the vehicle's electronic systems are not communicating as they should. This can lead to various issues, including malfunctioning lights, power windows, or other electronic components. For example, in a 2018 Jeep Wrangler, you might notice your headlights flickering or the interior lights failing to operate correctly. This code can often arise after an accident or due to water ingress in the electrical connectors. It's crucial to address this promptly, as unresolved communication issues can lead to further electrical problems or even leave you stranded. Additionally, some common symptoms include warning lights on the dash, intermittent power loss to certain features, or difficulties with starting the vehicle. A clear understanding of this code will help you take the necessary steps to diagnose and repair the underlying problem, ensuring your vehicle operates smoothly and safely.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0B90 is present:
- The check engine light remains illuminated, indicating potential electronic faults.
- Power windows may operate intermittently, causing frustration during use.
- Headlights flicker or fail to turn on entirely, posing safety risks while driving at night.
- The vehicle may experience difficulty starting, which can leave you stranded.
- Dashboard warning lights may illuminate unexpectedly, indicating system malfunctions.
Possible Causes
Most common causes of U0B90 (ordered by frequency):
- The most common cause is damaged wiring or connectors, which can account for about 60% of cases. Look for frayed wires or corroded connectors, particularly in older vehicles.
- Another frequent cause is software issues within the BCM or other control modules, which may require a software update or reprogramming for resolution.
- Water ingress into connectors can lead to communication failures, so inspecting for moisture or corrosion is vital.
- Less common but serious causes include a failing BCM, which might require replacement if diagnostics confirm its malfunction.
- Rarely, a faulty ignition switch can disrupt power to modules, causing communication errors and triggering the U0B90 code.
U0B90 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair and Connector Replacement
Repair damaged wiring and replace corroded connectors to restore communication.
- Total: $100 - $300
- Success rate: 85%
BCM Software Update
Update or reprogram the body control module to resolve communication issues.
- Total: $75 - $150
- Success rate: 90%
BCM Replacement
Replace the body control module if diagnostics confirm failure.
- Total: $400 - $800
- Success rate: 95%
Money-Saving Tips for U0B90
- 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 U0B90 Diagnosis Process
Follow these systematic steps to accurately diagnose U0B90. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Start with an initial visual inspection of wiring and connectors for any visible damage or corrosion (5-10 minutes)
Step 1: Start with an initial visual inspection of wiring and connectors for any visible damage or corrosion (5-10 minutes).
Step 2: Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all codes and freeze frame data for context (10-15 minutes)
Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all codes and freeze frame data for context (10-15 minutes).
Step 3: Step 3: Conduct component testing for suspected faulty modules using a multimeter or specialized diagnostic equipment (20-30 minutes)
Step 3: Conduct component testing for suspected faulty modules using a multimeter or specialized diagnostic equipment (20-30 minutes).
Step 4: Step 4: After repairs, perform a system function test to ensure all modules are communicating properly and clear the codes (10-15 minutes)
Step 4: After repairs, perform a system function test to ensure all modules are communicating properly and clear the codes (10-15 minutes).
Step 5: Step 5: Finish with a road test under various conditions to confirm the repairs were successful and the U0B90 code does not return (15-20 minutes)
Step 5: Finish with a road test under various conditions to confirm the repairs were successful and the U0B90 code does not return (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: Resolving U0B90 in a 2018 Ford Fusion
Vehicle: 2018 Ford Fusion, 45,000 miles
Problem: Customer reported intermittent power issues with lights and windows.
Diagnosis: After using the GeekOBD APP, the U0B90 code was identified alongside a few other codes. Visual inspection revealed a corroded connector.
Solution: Replaced the damaged connector and performed a software update on the BCM.
Cost: $200
Result: All systems were restored to normal operation, and the customer reported no further issues.
Case Study 2: Addressing U0B90 in a 2020 Jeep Wrangler
Vehicle: 2020 Jeep Wrangler, 20,000 miles
Problem: Vehicle experienced dashboard lights flickering and difficulty starting.
Diagnosis: The GeekOBD APP showed the U0B90 code. Inspection found damaged wiring due to water exposure.
Solution: Repaired the wiring and replaced the BCM due to extensive damage.
Cost: $600
Result: The vehicle functioned perfectly after repairs, with no further code reappearances.