B2710 Buick Code - Open Key Pellet

The code B2710 indicates an "Open Key Pellet" fault, meaning the vehicle's security system has detected an issue with the resistance value of the key's pellet (resistor) not being read properly.

Symptoms include the engine not starting, the security light staying on or flashing, and failure of the vehicle's anti-theft system to recognize the key.

The main causes are a worn or damaged key pellet, a dirty or corroded key, a faulty ignition lock cylinder, or damaged wiring in the vehicle's Passkey system.

Start by cleaning the key pellet and inspecting it for damage. If the key is fine, check the ignition lock cylinder and wiring for faults. Replacement of the key or ignition cylinder may be necessary.

Bypassing the Passkey system is not recommended, as it compromises the vehicle's security. Proper repair of the key or security system is the best solution.

Repair costs vary, but a replacement key typically costs $50–$150, while replacing the ignition lock cylinder can cost $200–$400, including labor.

Yes, a qualified automotive locksmith can often cut and program a new key or repair the ignition lock cylinder to resolve the issue.

Clearing the code will not fix the underlying issue. The root cause, such as a faulty key or ignition component, must be addressed to prevent the code from returning.

A weak or dead battery is unlikely to cause this code directly, but it may contribute to other electrical issues that affect the security system.

To prevent recurrence, avoid excessive wear on the key, keep the key pellet clean, and ensure the ignition lock cylinder and wiring are in good condition.