• Check Engine Light is on
• Intermittent electrical issues
• Failure of certain vehicle functions
• Faulty control module
• Damaged or corroded wiring or connectors
• CAN bus network issues
CAN Bus: A robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.
Control Module: An electronic device that manages various functions of the vehicle.
• U0100
• U0140
This code means that your car's computer is having trouble talking to one of the parts in your car. It's like when your phone can't connect to the internet.
U0677 indicates a communication error between the vehicle's control modules.
The U0677 code is a communication fault between the control modules over the CAN (Controller Area Network) bus. This can occur when a module fails to send or receive data correctly.
• Use an OBD-II scanner to confirm the code.
• Inspect wiring and connectors for damage.
• Test the communication network for continuity.
• Repair or replace damaged wiring/connectors.
• Replace the faulty control module.
• Reset the vehicle's computer system.
• OBD-II Scanner
• Multimeter
• Wiring repair tools
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain vehicle wiring.
• Avoid exposure to extreme moisture or temperatures.
• Ensure software updates are performed by a professional.
Communication Error
• Avoid driving long distances until the issue is resolved.
• Consult a professional mechanic for a thorough diagnosis.
Check with the vehicle manufacturer for warranty coverage on control modules.
U0677 is a relatively uncommon code, often linked to specific models with known communication issues.
Moderate – While the vehicle may still be operable, unresolved communication issues can lead to further complications.
Driving with unresolved communication errors can lead to unexpected vehicle behavior. Ensure repairs are conducted by a certified professional.
• Vehicle ignition in the ON position.
• All electrical systems active.
The control modules are typically located in the engine bay or under the dashboard.
Q: Can I drive with a U0677 code?
A: It's not recommended to drive long distances as it may lead to further issues.
Q: Is a U0677 code expensive to fix?
A: Costs can vary, but it typically ranges from $150 to $500 depending on the issue.
