• Warning lights on the dashboard
• Intermittent operation of vehicle systems
• Failure of certain electronic functions
• Faulty wiring or connections
• Defective control module
• Software glitch in the vehicle's network
Control Module: An electronic component that manages specific functions in the vehicle.
Network Communication: The exchange of data between different electronic systems in the vehicle.
• U0100
• U0140
This code means that the car's computer had trouble talking to one of the parts that helps it run smoothly. It's like when your phone can't connect to the Wi-Fi.
U3521 indicates a communication error between the vehicle's control modules.
The U3521 code is a network communication error code that signifies a loss of communication between one or more control modules in the vehicle. This can affect various systems depending on which modules are involved.
• Check for other error codes that may be related.
• Inspect wiring and connectors for damage or corrosion.
• Test the control modules for proper operation.
• Repair or replace damaged wiring or connectors.
• Reflash or update the software of the control module.
• Replace the faulty control module if necessary.
• OBD-II scanner
• Multimeter
• Diagnostic software
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect vehicle wiring and connectors.
• Ensure software updates are applied promptly.
• Avoid exposure of electronic components to moisture.
Network Communication Error
• Consult a professional mechanic for diagnosis.
• Avoid driving the vehicle if critical systems are affected.
• Keep a record of any recurring issues for future reference.
Check with your vehicle manufacturer for warranty coverage on electronic components.
U3521 has been reported in vehicles with complex electronic systems where communication between modules is critical.
Moderate – Addressing this code is important to ensure all vehicle systems function correctly.
Ignoring communication errors can lead to more significant issues and may affect vehicle safety.
• Vehicle ignition in the ON position
• All electrical systems operational
The control modules are typically located throughout the vehicle, including under the dashboard and in the engine compartment.
Q: Can I drive with a U3521 code?
A: It's best to have it checked as soon as possible, as it may affect vehicle systems.
Q: Will resetting the code fix the problem?
A: Resetting may clear the code temporarily, but the underlying issue needs to be addressed.
