Quick Answer
U0664 means: U0664 indicates a communication error between control modules.
Can I drive with U0664? Immediate attention is recommended as it may lead to further issues.
Common Questions
What does U0664 mean and how does it affect my car?
DTC U0664 indicates a communication error between various control modules in your vehicle. This can affect performance by causing systems to work improperly. For instance, you might experience engine hesitation, erratic electrical behavior, or warning lights appearing on your dashboard. Ignoring this code can lead to more severe engine issues or failures.
What are the most common causes of U0664 and how much does it cost to fix?
Common causes include wiring issues, with repair costs ranging from $100 to $300, and faulty control modules, which can cost between $400 and $800 to replace. Regular vehicle maintenance, including software updates, can help prevent these issues.
Can I drive my car with U0664 or should I stop immediately?
While you might be able to drive your vehicle with this code, it is not recommended as it can lead to erratic performance and safety issues. If you experience severe symptoms, it's best to stop driving and seek professional help.
How can I diagnose U0664 myself using GeekOBD APP?
To diagnose U0664 using GeekOBD APP, first connect the OBD2 scanner to your vehicle's port. Use the app to scan for DTCs, and retrieve freeze frame data for additional context. Investigate the wiring and check for any anomalies in communication between modules.
What vehicles are most commonly affected by U0664?
DTC U0664 is frequently reported in vehicles such as the 2015-2018 Honda Accord, Toyota Camry, and Ford F-150. Always check for any recalls or TSBs that may relate to communication issues.
How can I prevent U0664 from happening again?
To prevent U0664 from recurring, maintain regular vehicle inspections, keep wiring connections clean and intact, and ensure that your vehicle's software is updated according to the manufacturer’s recommendations.
What is U0664?
Diagnostic Trouble Code (DTC) U0664 refers to a communication error between control modules, often indicating that there is a malfunction in the communication bus. This can disrupt the normal operation of various systems within your vehicle, including the engine, transmission, and other critical components. When your car's onboard computer systems can’t communicate effectively, it can lead to performance issues, warning lights on the dashboard, and could potentially prevent your vehicle from starting altogether. For example, in vehicles like the 2015-2018 Honda Accord and the Toyota Camry, this code may indicate issues with the CAN (Controller Area Network) or LIN (Local Interconnect Network) systems that facilitate communication between various modules. If you ignore this code, you might experience symptoms such as erratic electrical behavior, dashboard warnings, or decreased fuel efficiency. Addressing this code promptly is crucial for maintaining your vehicle's reliability and performance, as unresolved communication faults can lead to more significant issues down the line.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0664 is present:
- Check engine light stays on constantly, indicating a potential issue that requires diagnostics.
- Engine hesitates during acceleration, resulting in a less responsive driving experience.
- Dashboard warning lights may illuminate sporadically, suggesting that multiple systems are affected.
- Inconsistent behavior of electrical components, such as power windows or radio, indicating communication disruptions.
- Fuel economy decreased by 10-15%, potentially due to the engine not operating optimally.
Possible Causes
Most common causes of U0664 (ordered by frequency):
- The most common cause is wiring issues, accounting for about 40% of cases. Damaged or corroded wires can disrupt communication.
- A second frequent cause is a faulty control unit, where one of the modules fails to send or receive data correctly.
- Another cause could be software glitches in the vehicle's computer systems; regularly updating your vehicle's software can prevent this.
- Less common but serious is a complete failure of the CAN bus system, which can stop communication altogether.
- A rare cause might be an aftermarket accessory interfering with the vehicle's communication network.
U0664 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repair or replace damaged wiring in the communication bus.
- Total: $100 - $300
- Success rate: 85%
Control Module Replacement
Replace the faulty control module that is causing communication failure.
- Total: $400 - $800
- Success rate: 90%
Software Update
Perform a software update to resolve glitches.
- Total: $50 - $150
- Success rate: 75%
Money-Saving Tips for U0664
- 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 U0664 Diagnosis Process
Follow these systematic steps to accurately diagnose U0664. 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 vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive 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: Communication Issue Resolved in 2017 Honda Accord
Vehicle: 2017 Honda Accord, 45,000 miles
Problem: Customer reported erratic dashboard lights and engine hesitation.
Diagnosis: After scanning the vehicle, DTC U0664 was found. A visual inspection revealed damaged wiring in the CAN bus.
Solution: Repaired the damaged wiring and cleared the DTC. Conducted a successful road test.
Cost: $250 (including parts and labor)
Result: Customer reported no further issues and improved vehicle responsiveness.
Case Study 2: Control Module Replacement on 2016 Toyota Camry
Vehicle: 2016 Toyota Camry, 60,000 miles
Problem: Vehicle would not start, with multiple dashboard warning lights illuminated.
Diagnosis: DTC U0664 was retrieved. Testing indicated a failure in the main control module.
Solution: Replaced the control module and updated the vehicle's software.
Cost: $600 (parts and labor)
Result: The vehicle started without issues, and all systems operated normally.