--- title: Cadillac/GM Relearn Procedure description: Turn ON the ignition with the engine OFF Attempt to start the engine, then release the key to ON (vehicle will not start) Observe the SECURITY telltale (th --- - [Help](https://www.upfix.com/help-center/) - [Track](https://www.upfix.com/order-tracking/) - [How It Works](https://www.upfix.com/how-it-works/) - [Contact](https://www.upfix.com/contact-us/) - [Shipping Address](https://www.upfix.com/how-it-works/shipping-instructions/) [![](https://blog.upfix.com/hubfs/UpFix%20logo.png)](https://www.upfix.com/) [![](https://blog.upfix.com/hubfs/web.png)upfix.com](https://www.upfix.com/) [![](https://blog.upfix.com/hubfs/phone.png)888-979-9343](tel:888-979-9343) - - - [diy-auto-tips](https://blog.upfix.com/tag/diy-auto-tips) [ecm-ecu-engine-computer-module](https://blog.upfix.com/tag/ecm-ecu-engine-computer-module) # Cadillac/GM Relearn Procedure [![John Wells](https://blog.upfix.com/hs-fs/hubfs/JohnWells.png?width=50&height=50&name=JohnWells.png)](https://blog.upfix.com/author/johnwells) [John Wells](https://blog.upfix.com/author/johnwells) March 28 2017 Last updated: November 24 2023 1. Turn ON the ignition with the engine OFF 2. Attempt to start the engine, then release the key to ON (vehicle will not start) 3. Observe the SECURITY telltale (this is the security light), after approximately **10 minutes** the telltale will turn OFF. 4. Turn OFF the ignition, and wait **5 seconds**. 5. Repeat steps 1 through 4 two more times for a total of 3 cycles/**30 minutes** (the vehicle is now ready to relearn the Passlock ™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK). **IMPORTANT:** the vehicle learns the Passlock™ Sensor Data Code and/or password \*\*\*\*\*the next ignition switch transition from the OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle. 6. Start the engine (the vehicle has now learned the Passlock™ Sensor Data Code and/or password) Previous Post ###### [GM Vehicle - Passkey III – Transponder Ignition Key](https://blog.upfix.com/gm-vehicle-passkey-iii-transponder-ignition-key) Next Post ###### [DTC Code: C0265 - ABS EBCM Light On](https://blog.upfix.com/dtc-code-c0265-abs-ebcm-light) ### Similar Blog Posts #### [Land Rover Factory DTC Code Definitions](https://blog.upfix.com/land-rover-factory-dtc-code-definitions) [![](https://blog.upfix.com/hs-fs/hubfs/Imported_Blog_Media/MAZDA-DTC-OBD-CODE-GRAPHIC-copy-2.png?width=352&name=MAZDA-DTC-OBD-CODE-GRAPHIC-copy-2.png)](https://blog.upfix.com/mazda-dtc-code-definitions-solutions) #### [Mazda DTC Code(s) | Free Cheat Sheet & Solution Guide](https://blog.upfix.com/mazda-dtc-code-definitions-solutions) [![](https://lh7-rt.googleusercontent.com/docsz/AD_4nXfevdO0HjJt5_zYoyYfyQ3JGUTtNixq29BfCdcdXF7bf_8XEi0W_OnlMjLRgkRvGWv3mbuIVbl0GhRBQnNcrw0h0H_OAA2sb2HStRJQiUYo95lbCE0AKRQtkNWGPOxgM1NJDXsdRQy72l7yExDGZWI9YOZC?key=PPfL4RC0FMHbk586O6p99w)](https://blog.upfix.com/repairing-a-faulty-ecu-seamlessly-with-upfix) #### [How to Repair a Faulty ECU | UpFix Part Repair Guide](https://blog.upfix.com/repairing-a-faulty-ecu-seamlessly-with-upfix) ### ADDRESS UpFix 4991 BU Bowman Dr Buford, GA 30518 **International Shipping Available:** We ship to USA and Canada ### ABOUT Thank you so much for considering UpFix. 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All rights reserved. [tel:888-779-9029](tel:888-779-9029) - - - ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "John Wells", "url" : "https://blog.upfix.com/author/johnwells" }, "dateModified" : "2023-11-24T19:10:59.938Z", "datePublished" : "2017-03-28T04:00:00.000Z", "headline" : "Cadillac/GM Relearn Procedure", "mainEntityOfPage" : { "@id" : "https://blog.upfix.com/cadillac-gm-relearn-procedure", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.upfix.com/hubfs/UpFix%20logo.png" }, "name" : "UpFix" } } ```