![]() 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. Passlock Light On Preventing Engine to Start ∞ 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. ![]() Immobilizers are “electronic security device fitted to an automobile that prevents the engine from running unless the correct key (or token) is present.” Well, Passlock should be called the Great Immobilizer because not only does it stop thieves with no keys, it also stops owners with the right keys. Passlock is an immobilizer introduced by GM in many mid-to-late 1990’s vehicles. ![]()
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