Quick Answer
U0663 means: U0663 indicates a communication fault between vehicle control modules.
Can I drive with U0663? Immediate attention recommended to avoid further issues.
Common Questions
What does U0663 mean and how does it affect my car?
U0663 signifies a communication problem between your vehicle's control modules. This can affect critical systems like engine performance and safety features, leading to decreased reliability and potential safety hazards.
What are the most common causes of U0663 and how much does it cost to fix?
Common causes include faulty wiring (60%), failing control modules (25%), and corrosion at connectors. Repair costs range from $100 for wiring repairs to $1,200 for module replacements.
Can I drive my car with U0663 or should I stop immediately?
It's advisable to limit driving until the issue is resolved, as continued operation can lead to further damage and safety risks.
How can I diagnose U0663 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and check module communication status to identify the issue more accurately.
What vehicles are most commonly affected by U0663?
Vehicles such as the 2015-2020 Ford F-150 and other models from manufacturers like Jeep and Dodge have reported occurrences of this code.
How can I prevent U0663 from happening again?
Regular maintenance, including inspections of wiring and connectors, can help prevent issues. Keeping your vehicle clean and dry also reduces the risk of corrosion.
What is U0663?
The diagnostic trouble code U0663 indicates a communication error within the vehicle's control modules, specifically relating to the communication bus system that interconnects these modules. In simpler terms, this code suggests that one or more of the modules in your vehicle, such as the engine control module (ECM), transmission control module (TCM), or body control module (BCM), are unable to effectively communicate with each other. This can lead to serious issues in your vehicle's operation, including erratic performance or even complete failure of certain systems. The communication bus is essential for the proper functioning of various vehicle systems, including engine management, transmission shifting, and safety features. When this code is triggered, drivers may experience symptoms like the check engine light illuminating, erratic engine performance, or malfunctioning safety features. For example, in a 2015 Ford F-150, you might notice that the truck's stability control feature fails to engage properly, which could pose a safety risk. It’s crucial to address this code promptly to ensure the safety and reliability of your vehicle.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0663 is present:
- The check engine light stays on constantly, indicating a persistent issue with vehicle communication.
- Engine performance may hesitate during acceleration, leading to a less responsive driving experience.
- Fuel economy decreased by 10-15%, indicating possible inefficiencies due to communication breakdown.
- Malfunctioning features such as traction control or ABS, which may not operate correctly due to module communication failure.
- Intermittent electrical issues, such as dashboard lights flickering or warning messages that appear and disappear.
Possible Causes
Most common causes of U0663 (ordered by frequency):
- The most common cause of U0663 is a faulty wiring connection or damaged harness, occurring in about 60% of cases. This could stem from wear and tear or environmental factors.
- A failing control module (like the ECM or BCM) is another significant cause, often due to internal faults or software glitches. This accounts for around 25% of U0663 cases.
- Corrosion at the connectors or terminals can lead to communication failures; regular inspections can prevent this issue.
- A less common but serious cause includes water intrusion into electrical components, especially in vehicles exposed to heavy rain or flooding.
- Rarely, a complete failure of the communication bus due to a manufacturing defect can occur, necessitating a full system replacement.
U0663 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repairing damaged wiring or connectors to restore communication.
- Total: $100 - $300
- Success rate: 85%
Control Module Replacement
Replacing a faulty control module to restore full functionality.
- Total: $400 - $1,200
- Success rate: 90%
Money-Saving Tips for U0663
- 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 U0663 Diagnosis Process
Follow these systematic steps to accurately diagnose U0663. 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, ensuring they are functioning properly (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, ensuring they are functioning properly (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success and ensure the issue is resolved (15-20 minutes)
Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success and ensure the issue is resolved (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: 2015 Ford F-150 Communication Issue
Vehicle: 2015 Ford F-150, 75,000 miles
Problem: Customer reported check engine light and unstable engine performance.
Diagnosis: Diagnostic scan revealed U0663. Inspected wiring harness and found corrosion.
Solution: Repaired wiring connections and cleaned terminals, resolved communication issue.
Cost: $250
Result: Vehicle performance improved; check engine light cleared and did not return.
Case Study 2: 2018 Jeep Grand Cherokee Module Replacement
Vehicle: 2018 Jeep Grand Cherokee, 50,000 miles
Problem: Customer experienced multiple warning lights and poor engine performance.
Diagnosis: OBD scan revealed U0663. Control module was found to be malfunctioning.
Solution: Replaced the engine control module with a new unit.
Cost: $950
Result: All systems restored to normal functionality; no further issues reported.