Unable to Program Keys Cadillac CTS, SRX - keywords B3031 B3976 crank deterrent learn nocrank nostart PK3 security start theft

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

When adding or replacing an ignition key on a Cadillac CTS or SRX, the Technician may not be able to program the replacement key to the vehicle. This will result in a no crank no start condition or a vehicle that starts and runs with the security light on when using the new key and may be accompanied by a DTC B3976 and/or a DTC B3031

The manufacturing process has allowed some replacement keys to be produced without configuring the transponder in the key head. If you are attempting to add or replace a key and you experience this symptom, obtain another replacement key and follow the published eSI procedures to program. Please note that you may need to try several replacement keys before you get one that will work. The manufacturing process is being modified to correct this concern as soon as possible.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

(2003-2005 Cadillac CTS) and (2004-2005 Cadillac SRX)