BMW Keys
BMW keys and Fobs
BMW key-related trouble codes often appear in the CAS (Car Access System) module, signaling issues such as a low key battery (CC-ID 65, 67, 68), an incorrect key (CAS 38), or starter/restart problems (CAS 22). They can also involve general battery issues (CC-ID 213, 229) or communication errors. A diagnostic tool is required to identify specific P-codes or dashboard CC-ID codes and determine whether the issue is with the key, the battery, or the vehicle’s immobilizer system.
Common BMW Key/Battery Codes
CC-ID 65, 67, 68: Key battery low, discharged, or comfort access function low (for comfort access keys).
CAS 38: Wrong remote key detected.
CAS 22: Starter problem or engine cannot restart.
CC-ID 213, 229: General battery not charged or battery low.
CC-ID 220: High battery discharge rate.
CC-ID 304, 305: Check battery condition or terminals.
How to Find Your Codes
Dashboard (CC-ID Codes): Turn the ignition on without starting the engine. Use the BC button on the turn signal stalk to cycle through the Check Control messages, and hold the BC button to reveal the three-digit CC-ID code.
Scan Tool (P-Codes/Specific Codes): Plug an OBD-II scanner into the diagnostic port (usually located under the dashboard) to access deeper fault codes, especially those related to the DME (engine control module) or CAS modules, such as CAS 38 or CAS 22.
BMW Diamond-Shaped Remote Head Key
The traditional ignition lock cylinder, which uses internal tumblers that align with a series of cuts or notches on the key to allow rotation, was used by BMW in many models until around 2010. The key is a diamond-shaped remote head key with a rechargeable battery. Each battery type has a limited number of charging cycles before its ability to hold a charge decreases. When this happens, the convenience of the remote functions is lost.
This type of diamond-shaped BMW key fob was designed to charge inductively while driving. When the key is inserted into the ignition and the vehicle is running, the battery inside the key is recharged through inductive coupling by the EWS ring antenna, a circular antenna located around the ignition switch. EWS (Elektronische Wegfahrsperre) is the German term for “Electronic Immobilizer.”
The transponder in the original key is part of the circuit board assembly. In aftermarket keys, the remote control and transponder are two separate components, with a replaceable battery used to power the remote control.
BMW remote head key Original
BMW diamond shaped remote head key Aftermarket
BMW remote head key Original
BMW diamond shaped remote head key Aftermarket
Early “Rectangle” BMW Keyless Entry Remote
On BMW models with a push-button start ignition system, you will encounter keys designed to work with models equipped with the Comfort Access system, as well as different keys for models without Comfort Access.
For models without the Comfort Access system, you press buttons dedicated to locking and unlocking the doors and opening the trunk or tailgate. Once inside the vehicle, the key must be inserted into the key slot before using the push-button starter to turn the vehicle on and off.
BMW models equipped with a Comfort Access keyless entry system allow you to open the vehicle doors and start the engine without physically handling the key. The driver only needs to have the key on their person or nearby. Sensors detect the key, allowing the vehicle to be started with the push of a button.
Some models can also close open windows and the sunroof when the vehicle is locked remotely. To close the windows of a BMW using the key fob, press and hold the lock button until all open windows and the sunroof are closed. Remote keyless entry fobs also include a panic button, which activates the vehicle alarm as a standard feature.
Unlocking your vehicle has never been more convenient with the BMW Comfort Access system, which eliminates the need to use a traditional key or perform any additional steps other than touching the door handle.
BMW 3-Button Smart Key for comfort access System
BMW 3-Button Smart Key with comfort access
BMW 3-Button Smart Key Without comfort access
BMW 3-Button Smart Key without comfort access
Newer versions, such as Comfort Access 2.0, allow for hands-free operation by unlocking the vehicle as you approach and locking it as you walk away.
The Comfort Access keyless entry system consists of door handles equipped with special remote sensors. These sensors recognize your key from a distance of up to approximately five feet, even if it is inside your pocket or bag. This allows you to unlock the vehicle by placing your hand inside the door handle or lock it with a single touch on the handle ridges. An audible signal confirms when the doors are locked or unlocked.
The Comfort Access system allows you to customize the keyless entry process. Through the vehicle’s menu settings, you can choose whether the system unlocks all doors or only the driver’s door with the first touch. In some models, the system can also be configured to automatically close the windows and sunroof and fold in the mirrors.
The keyless entry system also extends to the trunk, allowing you to unlock it by simply touching the handle. On newer models, hands-free opening and closing of the cargo area is available. Sensors detect specific foot movements near the center of the trunk, allowing the trunk to open or close automatically.
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BMW keys
