• Warning light on dashboard
• Loss of certain vehicle functions
• Intermittent operation of vehicle systems
• Faulty module
• Damaged wiring or connectors
• Network communication error
CAN bus: A robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.
Module: An electronic control unit in the vehicle's network.
• U0100
• U0121
This code means that the car's computer is having trouble talking to one of the parts it's supposed to communicate with.
The U0664 code indicates a communication error with a specific module in the vehicle's network.
U0664 is a network communication code indicating that the vehicle's control module is not receiving or sending signals properly to one of its connected components, often due to a loss of communication with a specific module on the CAN bus.
• Check for other codes
• Inspect wiring and connectors
• Test the suspect module
• Repair or replace damaged wiring
• Replace the faulty module
• Clear the codes and test the system
• OBD-II scanner
• Multimeter
• Wiring diagram
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular vehicle maintenance
• Inspect wiring and connectors periodically
• Ensure software updates are applied
Network Communication Issue
• Consult a professional mechanic
• Avoid driving long distances until fixed
Check with your vehicle manufacturer for warranty coverage on electronic components.
This code has become more common with the increased use of electronic modules in modern vehicles.
Moderate – It should be addressed soon to prevent further issues.
Ignoring this code may lead to safety-critical systems not functioning properly.
• Vehicle in ignition on position
• All modules powered
The affected module is usually located within the vehicle's network, often near the dashboard or engine compartment.
Q: Can I drive with a U0664 code?
A: It's not recommended as it may affect vehicle systems.
Q: Will the U0664 code clear itself?
A: It might clear if the issue is intermittent, but it's best to diagnose and fix the problem.
