Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's computer thinks the key you're using isn't the right one, so it won't start the engine.
The Electronic Immobilizer System (EWS) is designed to prevent unauthorized starting of the vehicle. This code indicates that the EWS received a code from the key that it does not recognize.
The EWS system is a security feature that uses a transponder chip in the key to communicate with the car's computer. If the code from the key doesn't match the one stored in the EWS module, the car won't start. This code suggests a mismatch or failure in this communication process.
• Engine won't start
• Security light on dashboard
• No response when turning the key
• Incorrect key used
• Faulty EWS module
• Damaged key transponder
EWS: Electronic Immobilizer System
Transponder: A device that transmits a coded signal
• Verify the correct key is being used.
• Check for damage to the key transponder.
• Scan the EWS module for additional fault codes.
• Reprogram the key to the EWS system.
• Replace the faulty EWS module.
• Repair or replace the key transponder.
• OBD-II scanner
• Key programming tool
• Multimeter
$100 - $500
Moderate
• BMW 3 Series
• BMW 5 Series
• BMW X5
• Use the correct key for the vehicle.
• Avoid physical damage to the key.
• Regularly check the EWS system for updates.
Security System Issue
• Ensure you are using the correct key.
• Have a spare key programmed as a backup.
Check with your vehicle manufacturer for warranty coverage on security system components.
The EWS system has been used in vehicles since the mid-1990s to enhance security by preventing unauthorized starting.
High – The vehicle will not start until the issue is resolved.
Always ensure that vehicle security systems are functioning properly to prevent unauthorized use.
• Vehicle in park or neutral
• Battery fully charged
The EWS module is typically located near the steering column or under the dashboard.
Q: Can I fix this code myself?
A: If you have the right tools and skills, you can try reprogramming the key, but it's often best handled by a professional.
Q: Will this code cause any damage to my car?
A: No, but it will prevent the car from starting until fixed.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.