• Check Engine Light is on
• Erratic vehicle behavior
• Loss of certain vehicle functions
• Faulty control module
• Wiring issues in the CAN bus
• Software glitch or update needed
CAN bus: A robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer.
Control Module: An electronic device in a vehicle that controls one or more of the electrical systems.
• U0100
• U0121
This code means that one of the computers in your car is not talking to another computer correctly. It's like when two friends are trying to talk, but one doesn't understand what the other is saying.
U0437 is a communication error code indicating invalid data received from a specific control module in the vehicle.
The U0437 code is set when a control module receives data from another module that it cannot interpret. This usually involves the Controller Area Network (CAN) bus system, which is responsible for communication between different modules in the vehicle.
• Perform a visual inspection of the wiring and connectors.
• Use a scan tool to check for additional codes and freeze frame data.
• Test the CAN bus communication lines for continuity.
• Repair or replace faulty wiring or connectors.
• Reprogram or replace the faulty control module.
• Clear the codes and test drive the vehicle.
• OBD-II scanner
• Multimeter
• CAN bus tester
$100 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect vehicle wiring and connectors.
• Keep vehicle software updated.
• Avoid aftermarket modifications that could affect the CAN bus.
Communication Error
• Have the vehicle inspected by a professional.
• Avoid ignoring the Check Engine Light.
• Consider regular maintenance checks.
Check with your vehicle manufacturer; some communication errors may be covered under warranty.
Communication errors like U0437 have become more common as vehicles incorporate more electronic control modules.
Moderate – While the vehicle may still operate, ignoring this issue could lead to further problems.
Driving with unresolved communication errors may affect vehicle safety systems.
• Vehicle at operating temperature
• All electrical components on
The control modules are typically located throughout the vehicle, including under the dashboard and in the engine bay.
Q: Can I drive with a U0437 code?
A: It's possible, but not recommended as it may affect vehicle performance and safety.
Q: Will disconnecting the battery clear the U0437 code?
A: It might temporarily clear the code, but the underlying issue needs to be addressed to prevent it from returning.
