Oct 8, 2023 · With the sensor bypassed, you’ll need to do an ignition switch on-off sequence to reset the Passlock control module to accept the resistor and disable anti-theft mode. Turn the key to Run for 10 minutes until the security light shuts off.

Mar 21, 2025 · 1. Replace the PassLock Sensor. GM’s PassLock system relies on a Hall Effect sensor inside your car’s ignition switch to detect key rotations. Over time, this sensor could unfortunately fail due to wear, corrosion, or electrical faults. As a result, this causes the system to falsely detect an unauthorized key.

Jan 9, 2012 · The easiest way to bypass the Passlock 2 system is to place a resistor between the passlock sensing wire and the ground reference wire. To find these wires, look for three wires that at some point are wrapped together, coming from the ignition barrel.

Nov 28, 2018 · When you bypass the passlock system you’re basically taking the lock cylinder case sensor out of the picture. You do this by inserting a resistor into the circuit that duplicates the voltage drop that would normally be caused by the lock cylinder case sensor.

Oct 29, 2014 · Your choice is to replace it all or BYPASS the system for good, which means your car can be hot-wired and stolen. If you replace the system components, I recommend replacing the whole enchilada, key cylinder included.

Nov 9, 2017 · The Passlock™ sensor is an internal resistor within the ignition switch. The ignition switch receives a 5-volt reference from the body control module (BCM) via the ignition key resistor signal circuit.

Contrary to popular belief, it is extremely easy to permanently bypass the Passlock II sensor system as long as the proper key for the lock cylinder is present. The top plastic cover of the steering column must be removed to expose the wiring.

May 20, 2018 · The short answer is there’s a problem with the sensor. Some have suggested that the pins in the system are “tin” plated and subject to oxidization over time. Others say their system is possessed by the devil and in need of an exorcist. I’ll …

Nov 9, 2010 · Any and all no-start issues directly related to the passlock II system. Step One: Start the truck, leave it in the park, and run during this process. Step Two: Locate the plug pictured below, The plug is under the dash near the steering column.

Oct 10, 2021 · This article describes how to bypass the "Passlock Sensor" on several models of GM cars. No soldering is required. You must perform all the steps. The Problem. You try to start your GM car. The engine starts, but dies in one or two …