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Posts Tagged: Passlock

Passlock how it works

Passlock how it works GM’s Passlock antitheft system uses a normal ignition key. The anti-theft portion is located inside the lock cylinder case; that’s why it’s called Passlock instead of the other antitheft versions known as PassKey. When you insert the proper ignition key and rotate the lock cylinder, a magnet mounted to the back side of the lock cylinder passes by a SECURITY hall effect style sensor mounted in the lock cylinder case. A hall effect sensor detects a magnetic field and sends a coded signal to the body … Read More

Fix PassLock

Diagnose, fix PassLock system This is one in a series of articles. READ THIS FIRST GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troublshoot and fix a PassLock system. But here are some more articles to help Click here to see the resetting procedure for PassLock Click … Read More

Passlock fixes

How to fix PassLock problems This is one in a series of Passlock fixes articles. READ THIS ARTICLE FIRST GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troublshoot and fix a PassLock system. But here are some more articles to help Click here to see the resetting procedure for … Read More

GM PassKey and PassLock overview

Diagnose problems with anti-theft systems in GM vehicles Read More


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