Quick Answer
U0B99 means: U0B99 indicates a communication failure among vehicle control modules.
Can I drive with U0B99? Address this issue promptly to avoid further complications.
Common Questions
What does U0B99 mean and how does it affect my car?
The U0B99 code indicates a communication failure among your vehicle's control modules, which can impact various systems including engine performance and electrical components. If not addressed, it can lead to more serious issues over time.
What are the most common causes of U0B99 and how much does it cost to fix?
Common causes include wiring issues, software glitches, and control module failures. Repair costs typically range from $100 for wiring repairs to over $1,200 for control module replacements.
Can I drive my car with U0B99 or should I stop immediately?
While you may be able to drive your vehicle, it's advisable to address the U0B99 code as soon as possible to prevent further complications or safety issues.
How can I diagnose U0B99 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for error codes and view freeze frame data, which can help you pinpoint the issue. Look for any related codes that might provide additional insights.
What vehicles are most commonly affected by U0B99?
Vehicles such as the 2016-2018 Ford Explorer and 2014-2017 Chevrolet Silverado frequently experience the U0B99 code, often due to electrical system issues.
How can I prevent U0B99 from happening again?
Regular maintenance, including checking and cleaning electrical connections and ensuring software updates are performed, can help prevent U0B99 from recurring.
What is U0B99?
The U0B99 diagnostic trouble code (DTC) is a generic code that indicates a communication issue within the vehicle's network, specifically related to the vehicle's control systems. This code is often triggered when one or more control modules, such as the Engine Control Unit (ECU), Body Control Module (BCM), or Transmission Control Module (TCM), are unable to communicate effectively. This can lead to various performance issues and may result in the check engine light illuminating on your dashboard. Commonly seen in vehicles like the 2016-2018 Ford Explorer and the 2014-2017 Chevrolet Silverado, U0B99 can affect how certain electrical components function, potentially leading to erratic behavior such as headlights flickering or issues with power windows. If left unaddressed, the underlying communication problem could escalate, leading to more severe electrical faults. It's essential to diagnose and repair the root cause promptly to maintain the vehicle's overall reliability and safety. Addressing U0B99 often involves checking for wiring issues, performing software updates, or replacing malfunctioning control modules, depending on the specific situation.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0B99 is present:
- Check engine light remains illuminated, indicating a need for immediate attention.
- Electrical components like power windows or locks may function erratically, creating a frustrating user experience.
- Intermittent issues with vehicle features, such as the radio or navigation system, that may cut out or reset unexpectedly.
- Poor fuel efficiency, potentially due to miscommunication between the engine and transmission modules.
- Delayed or rough shifting in automatic transmission vehicles, which can point to issues with the TCM.
Possible Causes
Most common causes of U0B99 (ordered by frequency):
- The most common cause is a wiring issue, such as damaged or corroded connections, which can occur in 30-40% of cases. Regular inspections can help prevent this.
- Another frequent cause involves software glitches in the control modules, especially after a recent update or repair. Always ensure that software is up-to-date to minimize issues.
- Electrical shorts or open circuits can also trigger U0B99, particularly in older vehicles with extensive wear and tear. Regular maintenance can help catch these problems early.
- Less commonly, a failing control module may be the culprit, which can lead to significant repair costs if replacement is necessary.
- In rare cases, environmental factors such as water intrusion into electrical connections can lead to communication failures, particularly in vehicles exposed to heavy rain or flooding.
U0B99 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repairing or replacing damaged wiring or connectors.
- Total: $100 - $300
- Success rate: 80%
Control Module Replacement
Replacing a faulty control module that is not communicating properly.
- Total: $500 - $1,200
- Success rate: 95%
Software Update
Updating software for the control modules to resolve communication issues.
- Total: $50 - $150
- Success rate: 70%
Money-Saving Tips for U0B99
- 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 U0B99 Diagnosis Process
Follow these systematic steps to accurately diagnose U0B99. 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: Repair Case Study: 2017 Ford Explorer Communication Failure
Vehicle: 2017 Ford Explorer, 45,000 miles
Problem: Customer reported intermittent electrical issues and a persistent check engine light.
Diagnosis: After scanning with GeekOBD APP, U0B99 was identified. Visual inspection revealed corroded wiring at the BCM.
Solution: Replaced the damaged wiring and updated the BCM software.
Cost: $320 (includes parts and labor)
Result: All electrical issues resolved, and the check engine light was cleared.
Case Study 2: Repair Case Study: 2015 Chevrolet Silverado Module Replacement
Vehicle: 2015 Chevrolet Silverado, 60,000 miles
Problem: Customer experienced delayed shifting and warning lights on the dashboard.
Diagnosis: DTC U0B99 was retrieved, indicating control module communication failure.
Solution: Replaced the TCM and reprogrammed it to the vehicle.
Cost: $900 (replacement module and labor included)
Result: Shifting issues resolved and vehicle performance restored.