• Warning lights on the dashboard
• Intermittent electrical issues
• Loss of certain vehicle functions
• Faulty control module
• Damaged LIN bus wiring
• Poor electrical connections
LIN: Local Interconnect Network, a communication protocol used in vehicles.
OBD-II: On-Board Diagnostics, a standardized system for vehicle diagnostics.
• U0073
• U0100
This code means that the computer in your car is having trouble talking to one of its parts. It's like when your phone can't connect to the internet.
U0091 indicates a communication problem between the control modules in the vehicle, specifically involving the Local Interconnect Network (LIN) bus.
The U0091 code is set when there is a loss of communication with a specific module on the Local Interconnect Network (LIN) bus. This can occur due to wiring issues, a faulty module, or problems with the LIN bus itself.
• Check for other related codes
• Inspect LIN bus wiring for damage
• Test the control module functionality
• Repair or replace damaged wiring
• Replace faulty control module
• Ensure all connections are secure
• OBD-II scanner
• Multimeter
• Wiring diagram
$100 - $500
Moderate
• Ford Focus
• Chevrolet Malibu
• Volkswagen Jetta
• Regularly inspect vehicle wiring
• Ensure all software updates are applied
• Avoid aftermarket modifications that affect vehicle electronics
Communication Error
• Do not ignore warning lights on the dashboard
• Have regular maintenance checks
• Consult a professional if unsure
Check with your vehicle manufacturer for warranty coverage on electronic components.
U0091 has been reported in vehicles with complex electronic systems, often related to wiring issues or module failures.
Moderate – Should be addressed to prevent loss of vehicle functions.
Ignoring this code may lead to loss of critical vehicle functions, which can be unsafe.
• Vehicle in ON position
• All electrical systems active
The component involved is typically located within the vehicle's electronic control module area, often under the dashboard or near the engine bay.
Q: Can I drive with a U0091 code?
A: It's not recommended as it may lead to loss of important vehicle functions.
Q: How do I clear a U0091 code?
A: Fix the underlying issue and use an OBD-II scanner to clear the code.
