BMW Error Code 4501: How to Fix It

Q: What does BMW error code 4501 mean?

Error code 4501 indicates a communication fault between the Electronic Immobilizer (EWS) or Car Access System (CAS) and the engine control module, preventing the vehicle from starting.

Q: Can I drive my BMW with error code 4501?

No, you cannot drive with error code 4501 as it prevents the engine from starting. This is a critical immobilizer fault that requires immediate attention.

Q: How much does it cost to fix BMW error code 4501?

Repair costs vary from $200-500 for simple fixes like wiring repairs to $800-1500 if EWS/CAS module replacement and programming is required at a BMW dealer.

Q: Will a dead battery cause BMW error code 4501?

Yes, a weak or dead battery can cause communication faults between modules, triggering error code 4501. Always check battery voltage first as it's the most common cause.

Q: Can I reset BMW error code 4501 myself?

You can try basic resets like disconnecting the battery, but persistent code 4501 usually requires professional BMW diagnostic equipment for proper diagnosis and repair.

Abstract

BMW Error Code 4501 indicates a communication fault between the Electronic Immobilizer (EWS) or Car Access System (CAS) and the engine control module. This critical error prevents the vehicle from starting as the immobilizer system cannot verify the key's authenticity.