{"id":23730,"date":"2026-01-30T03:45:45","date_gmt":"2026-01-30T03:45:45","guid":{"rendered":"https:\/\/www.obd2tool.com\/blog\/?p=23730"},"modified":"2026-01-30T03:45:45","modified_gmt":"2026-01-30T03:45:45","slug":"tech2-diagnostic-connection-problem-candi-module-not-working","status":"publish","type":"post","link":"https:\/\/www.obd2tool.com\/blog\/tech2-diagnostic-connection-problem-candi-module-not-working\/","title":{"rendered":"Tech2 Diagnostic Connection Problem \u2013 CANDI Module Not Working"},"content":{"rendered":"<h3>Problem Description<\/h3>\n<p><strong>Issue:<\/strong><br \/>\nThe CANDI module stops working when connecting the Tech2 diagnostic tool to the vehicle. The diagnostic session cannot be established normally.<\/p>\n<p>This issue is commonly reported when the Tech2 is powered incorrectly during vehicle diagnosis.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-23731\" src=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-1.jpg\" alt=\"\" width=\"476\" height=\"600\" srcset=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-1.jpg 476w, https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-1-238x300.jpg 238w\" sizes=\"(max-width: 476px) 100vw, 476px\" \/> <img loading=\"lazy\" class=\"alignnone size-full wp-image-23732\" src=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-2.jpg\" alt=\"\" width=\"473\" height=\"745\" srcset=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-2.jpg 473w, https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-2-190x300.jpg 190w\" sizes=\"(max-width: 473px) 100vw, 473px\" \/> <img loading=\"lazy\" class=\"alignnone size-full wp-image-23733\" src=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-3.jpg\" alt=\"\" width=\"438\" height=\"594\" srcset=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-3.jpg 438w, https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-3-221x300.jpg 221w\" sizes=\"(max-width: 438px) 100vw, 438px\" \/> <img loading=\"lazy\" class=\"alignnone size-full wp-image-23734\" src=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-4.jpg\" alt=\"\" width=\"500\" height=\"660\" srcset=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-4.jpg 500w, https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-4-227x300.jpg 227w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<h3>Solution &amp; Professional Recommendation<\/h3>\n<p><strong>Important:<\/strong><br \/>\nWhen connecting the Tech2 to a vehicle for diagnosis, do not connect an external 12V charger at the same time.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-23735\" src=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-5.jpg\" alt=\"\" width=\"479\" height=\"650\" srcset=\"https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-5.jpg 479w, https:\/\/www.obd2tool.com\/blog\/wp-content\/uploads\/2026\/01\/Tech2-Diagnostic-Connection-Problem-CANDI-Module-Not-Working-5-221x300.jpg 221w\" sizes=\"(max-width: 479px) 100vw, 479px\" \/><\/p>\n<p><strong>Why this matters:<\/strong><\/p>\n<ul>\n<li>The vehicle already supplies power directly to the Tech2 and CANDI module through the diagnostic port<\/li>\n<li>Using an additional 12V power source may cause voltage conflict or communication failure<\/li>\n<li>This can lead to the CANDI module not being detected or appearing to malfunction<\/li>\n<\/ul>\n<h3>Correct Usage Guidelines<\/h3>\n<p>\u2714 Connect the Tech2 directly to the vehicle\u2019s diagnostic port<br \/>\n\u2714 Ensure the vehicle ignition is in the correct position (ON \/ Engine OFF if required)<br \/>\n\u274c Do not connect an external 12V charger during diagnosis<\/p>\n<p>After following these steps, reconnect the <a href=\"https:\/\/www.obd2tool.com\/goods-10563-GM-Tech2-Tech-2-GM-Scanner.html\">Tech2<\/a> and test the CANDI module again.<\/p>\n<h3>Need Further Assistance?<\/h3>\n<p>If the CANDI module still does not work after removing the external power source, the issue may be related to cable condition, firmware version, or hardware compatibility.<\/p>\n<p>\ud83d\udc49 Contact our technical support team <a href=\"https:\/\/www.obd2tool.com\">https:\/\/www.obd2tool.com<\/a> for professional diagnosis and solutions.<\/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>Problem Description Issue: The CANDI module stops working when connecting the Tech2 diagnostic tool to the vehicle. The diagnostic session<!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":1,"featured_media":23734,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1832,2255,2582],"tags":[],"views":358,"_links":{"self":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts\/23730"}],"collection":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/comments?post=23730"}],"version-history":[{"count":1,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts\/23730\/revisions"}],"predecessor-version":[{"id":23736,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts\/23730\/revisions\/23736"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/media\/23734"}],"wp:attachment":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/media?parent=23730"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/categories?post=23730"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/tags?post=23730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}