• Check Engine Light is on
• Malfunctioning vehicle systems
• Erratic vehicle behavior
• Faulty control module
• Damaged or corroded wiring or connectors
• Network communication issues
Module: A part of the car's computer system that controls specific functions.
Network: The system of communication between different modules in the vehicle.
• U0100
• U0121
This code means that a part of the car's computer system, called a module, is not talking to the other parts like it should. It's like when one of your friends stops talking to the group during a game, and you need everyone to play together.
The U0661 code indicates a communication error with a specific module in the vehicle's network.
U0661 is a network communication code indicating that the vehicle's control module has lost communication with a specific module, usually the 'A' control module. This can be due to wiring issues, a faulty module, or network problems.
• Use a scan tool to check for additional codes.
• Inspect wiring and connectors for damage or corrosion.
• Test the suspect module for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty module.
• Reset the vehicle's computer system.
• OBD-II scanner
• Multimeter
• Wiring repair kit
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain vehicle wiring.
• Avoid exposure to moisture and corrosive substances.
• Ensure all software updates are applied to the vehicle.
Network Communication Issue
• Have a professional diagnose the issue to avoid further damage.
• Do not ignore the warning light; it could lead to more serious problems.
• Regular maintenance can help prevent such issues.
Check with the vehicle manufacturer for warranty coverage on electronic components.
This code is relatively common in modern vehicles with complex electronic systems and can often be traced back to wiring issues or faulty modules.
Moderate – While the vehicle may still operate, ignoring the issue could lead to further complications.
Driving with a malfunctioning control module may affect vehicle safety and performance. Address the issue promptly.
• Vehicle must be in a safe, stationary position.
• Ensure the ignition is in the 'on' position.
The affected module is usually located within the vehicle's control network, often near the dashboard or engine compartment.
Q: Can I drive my car with a U0661 code?
A: It's possible to drive, but it's not recommended as it may affect vehicle performance and safety.
Q: How do I reset the U0661 code?
A: After repairs, use an OBD-II scanner to clear the code from the vehicle's computer.
