• Check engine light on
• Erratic vehicle behavior
• Loss of communication with certain vehicle systems
• Faulty control module
• CAN bus wiring issues
• Software incompatibility
CAN bus: Controller Area Network bus, a vehicle's internal communication network.
Control Module: An electronic device that manages various functions in the vehicle.
• U0440
• U0441
Your car's computer received a message from another part of the car that it couldn't understand, like getting a text in a language you don't know.
The vehicle's control module received an invalid data message from another module.
U0442 is an OBD-II trouble code indicating that a control module has received a message from another module that it cannot interpret. This typically involves communication errors between modules on the vehicle's CAN bus network.
• Use an OBD-II scanner to confirm the code.
• Inspect the CAN bus wiring and connectors for damage.
• Check for any software updates for the control modules.
• Repair or replace damaged wiring or connectors.
• Update the software of the affected control modules.
• Replace the faulty control module if necessary.
• OBD-II scanner
• Multimeter
• Diagnostic software
$100 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly update vehicle software.
• Inspect wiring harnesses during routine maintenance.
• Avoid aftermarket modifications that may affect the CAN bus.
Communication Error
• Ensure all vehicle software is up to date.
• Consult a professional if the issue persists after basic checks.
• Avoid ignoring the check engine light.
Check with the vehicle manufacturer for warranty coverage on control modules and related components.
U0442 has been associated with communication issues in vehicles with advanced electronic systems, often requiring software updates to resolve.
Moderate – While the vehicle may still operate, unresolved communication issues can lead to further problems.
Driving with an unresolved communication error may lead to unpredictable vehicle behavior, posing safety risks.
• Vehicle is running.
• All modules are active and communicating.
Control modules are typically located throughout the vehicle, including under the dashboard, in the engine bay, and in the trunk.
Q: Can I drive with a U0442 code?
A: It's possible to drive, but it's not recommended as it may lead to further issues.
Q: How do I clear a U0442 code?
A: Fix the underlying issue, then use an OBD-II scanner to clear the code.
