OBD-II Network Error Code U0140: How to Fix It

Q: What does error code U0140 mean?

U0140 indicates lost communication between the vehicle's diagnostic system and the Body Control Module (BCM). The BCM controls electrical components like lights, windows, locks, and other comfort features, so this error can affect multiple systems.

Q: Can I still drive my car with U0140 code?

You may be able to drive the vehicle, but some electrical functions may not work properly. Essential systems like engine operation are usually unaffected, but features like power windows, lights, or door locks might malfunction. It's best to address the issue promptly.

Q: How much does it cost to fix U0140 error code?

Repair costs vary widely depending on the root cause. Simple fixes like replacing fuses cost $5-20, while BCM replacement can cost $500-1500 including programming. Most issues are resolved with basic electrical repairs costing $100-400.

Q: Will U0140 cause my car to fail inspection?

In most areas, U0140 is a communication code that won't cause an emissions-related inspection failure. However, if the BCM controls emissions-related components and they malfunction, it could indirectly cause a failure. Check your local inspection requirements.

Q: How do I prevent U0140 from happening again?

Keep battery connections clean and tight, protect wiring from damage, and address any electrical issues promptly. Regular maintenance and avoiding aftermarket electrical modifications that aren't properly installed can help prevent communication network problems.

Abstract

Error code U0140 indicates your vehicle has lost communication with the Body Control Module (BCM), which manages electrical components like lights, windows, and door locks. This communication breakdown can cause various electrical systems to malfunction or stop working entirely.