When the sensor defect starts, it usually presents itself as system fault code B2960. I’ll let you decide which one sounds more accurate. Others say their system is possessed by the devil and in need of an exorcist. Some have suggested that the pins in the system are “tin” plated and subject to oxidization over time. The short answer is there’s a problem with the sensor. When the key is inserted into the ignition, a magnet on the cylinder creates a signal to the ECM (engine control module) that essentially says everything is ok to start and run. Passlock uses a coded lock cylinder that essentially stops the engine from running until the proper key is detected. GM introduced many security systems – VATS, Passkey, Passlock, but if your GM has a key without a chip in it, chances are it’s passlock.
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