• HVAC system not working
• Check Engine Light is on
• Inconsistent cabin temperature
• Faulty HVAC control module
• Damaged or corroded wiring/connectors
• Network communication failure
ECU: Engine Control Unit
HVAC: Heating, Ventilation, and Air Conditioning
• U0100
• U0140
This code means that a part of the car's computer system isn't talking to another part like it should. Imagine if your phone couldn't connect to the internet - that's similar to what's happening here.
U0624 indicates a lost communication with the HVAC control module.
The U0624 code is set when the vehicle's main computer (ECU) loses communication with the Heating, Ventilation, and Air Conditioning (HVAC) control module. This can occur due to a faulty module, wiring issues, or a network problem.
• Check for other related codes
• Inspect wiring and connectors for damage
• Test the HVAC control module functionality
• Repair or replace damaged wiring/connectors
• Replace the HVAC control module if faulty
• Clear the codes and test the system
• OBD-II scanner
• Multimeter
• Wiring diagram
$150 - $800
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Ensure connectors are clean and secure
• Avoid moisture exposure to electronic components
Communication Error
• Have your vehicle inspected by a professional
• Avoid DIY repairs unless experienced with car electronics
Check your vehicle's warranty for coverage on electronic components.
This code has become more common with the increased complexity of vehicle electronic systems.
Moderate – It may not affect drivability immediately, but should be addressed to ensure proper HVAC function.
Driving with unresolved communication issues can lead to further vehicle malfunctions.
• Vehicle in ignition on position
• HVAC system activated
The HVAC control module is typically located behind the dashboard or in the center console area.
Q: Can I drive with a U0624 code?
A: Yes, but your HVAC system may not function properly, which can be uncomfortable in extreme weather.
Q: How do I reset the U0624 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, it should not return.
