Generic Network Automotive Error Code U0140: How to Fix It

Q: Can I drive with U0140 error code?

You should avoid driving with U0140 as it affects critical safety systems like lights, turn signals, and potentially anti-theft systems. Get it diagnosed and repaired as soon as possible.

Q: How much does it cost to fix U0140?

Repair costs vary widely depending on the cause. Simple fixes like blown fuses cost under $10, while BCM replacement can cost $500-1500 including programming.

Q: Will U0140 cause my car to not start?

Yes, U0140 can prevent your car from starting if the BCM controls the anti-theft system or starter relay. The vehicle may crank but not start, or not respond to the key at all.

Q: Can a weak battery cause U0140?

Yes, a weak battery or poor connections can cause communication errors including U0140. Always check the battery and charging system first as it's the most common and easiest fix.

Abstract

Error code U0140 indicates your vehicle has lost communication with the Body Control Module (BCM), which controls various electrical systems like lights, windows, and door locks. This serious issue is typically caused by wiring problems, a faulty BCM, or network bus communication failures that require immediate attention.