{"id":23070,"date":"2025-07-17T03:10:41","date_gmt":"2025-07-17T03:10:41","guid":{"rendered":"https:\/\/www.obd2tool.com\/blog\/?p=23070"},"modified":"2025-07-22T08:38:18","modified_gmt":"2025-07-22T08:38:18","slug":"gm-tech-2-scanner-what-you-need-to-know-for-bcm-relearn-and-programming","status":"publish","type":"post","link":"https:\/\/www.obd2tool.com\/blog\/gm-tech-2-scanner-what-you-need-to-know-for-bcm-relearn-and-programming\/","title":{"rendered":"GM Tech 2 Scanner: What You Need to Know for BCM Relearn and Programming"},"content":{"rendered":"<p><strong>Customer Inquiry:<\/strong> Hello! I&#8217;m looking for detailed information about using a GM Tech 2 scanner for my vehicle. I may need to perform a BCM (Body Control Module) relearn, and I\u2019m unsure about the software version or programming requirements involved. There are a lot of options online\u2014refurbished and imitation units\u2014and I want to make sure I get a reliable setup that will work properly. Thank you.<\/p>\n<p><strong>Chevy Mechanic Response:<\/strong> Thanks for your question! With years of experience working on GM vehicles, I can help clarify things.<\/p>\n<p>To perform most tasks, including BCM relearn, you will need a <a href=\"https:\/\/www.obd2tool.com\/goods-10563-GM-Tech2-Tech-2-GM-Scanner.html\">Tech 2 scanner<\/a> loaded with software version 33.004 or later. However, it\u2019s important to note that while the Tech 2 can perform functions like theft deterrent relearn and module synchronization via the &#8220;Body Control Module &gt; Special Functions&#8221; menu, it does not handle programming or flashing of modules.<\/p>\n<p><strong>For programming tasks such as flashing a new or replacement BCM, you&#8217;ll need:<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>A laptop with TIS2000 software installed<\/li>\n<li>A USB-to-RS232 adapter to connect your Tech 2 to the laptop<\/li>\n<\/ul>\n<p><strong>Further Customer Details<\/strong>: Thanks, that clears up a lot. I think I might be dealing with a Passlock or BCM issue. My truck starts but dies after a few seconds, and the anti-theft light turns on and stays lit. I\u2019ve attempted multiple key relearns with no success. Also, I&#8217;m noticing strange electrical behavior inside the cab.<\/p>\n<p><strong>Mechanic&#8217;s Diagnosis:<\/strong> Yes, that certainly sounds like a BCM or Passlock issue\u2014especially with the theft light remaining illuminated and the engine shutting off on a consistent timer. Since you&#8217;ve confirmed that fuel delivery is fine (good fuel rail pressure), the issue likely lies in a lack of communication or synchronization between the BCM and ECM.<\/p>\n<p><strong>Here are a few steps to take:<\/strong><\/p>\n<ol start=\"1\" data-spread=\"false\">\n<li>Inspect the BCM power and ground connections, especially beneath the dash. Clean and tighten any corroded or loose connections.<\/li>\n<li>Use the Tech 2 to check for B-class codes. Faulty BCMs may not always set theft-specific codes but can log other body-related electrical errors.<\/li>\n<li>Before replacing any components, try disconnecting the battery for 30 minutes, then attempt the 30-minute key relearn procedure again.<\/li>\n<\/ol>\n<p>If the theft light stays on after that, it\u2019s very likely the BCM is faulty and needs to be replaced and reprogrammed.<\/p>\n<p>Final Customer Question: Thanks again! If I decide to buy a Tech 2 scanner, will I still be able to get the TIS2000 software and use it for BCM programming?<\/p>\n<p>Mechanic&#8217;s Answer: Yes, you can still obtain TIS2000, though it may require some searching since it&#8217;s no longer officially supported. Just make sure the Tech 2 you purchase includes the necessary hardware and that you also get a compatible USB-to-RS232 adapter. With this setup, you&#8217;ll be able to perform both diagnostic and programming functions properly.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Customer Inquiry: Hello! I&#8217;m looking for detailed information about using a GM Tech 2 scanner for my vehicle. 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