![\"2007](\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/07\/2007-chevy-1500.jpg\")
I have Code P0641 on my 2007 Chevy 1500, Where should I start?<\/p>\nI have Code P0641 on my 2007 Chevy 1500, Where should I start?<\/p>\n
RESPONSE<\/p>\n
Check your connections at the computer and the wiring harness<\/a>. If all checks out you will most likely need to replace the ECM itself.<\/p>\n P0641 CHEVROLET – 5 Volt Reference Voltage Incorrect<\/strong><\/p>\n The control module has 2 internal 5-volt reference buses called 5-volt reference 1 and 5-volt reference 2 . Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.<\/p>\n I have Code P0641 on my 2007 Chevy 1500, Where should I start? RESPONSE Check your connections at the computer and the wiring harness. If all checks out you will most likely need to replace the ECM itself. P0641 CHEVROLET – 5 Volt Reference Voltage Incorrect The control module has 2 internal 5-volt reference buses… Read More »Code P0641 2007 Chevy 1500<\/span><\/a><\/p>\n","protected":false},"author":13732,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[3,1],"tags":[467,10679],"class_list":["post-34959","post","type-post","status-publish","format-standard","hentry","category-chevy","category-auto-repair-questions","tag-467","tag-code-p0641"],"_links":{"self":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/posts\/34959","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/users\/13732"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/comments?post=34959"}],"version-history":[{"count":0,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/posts\/34959\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/media?parent=34959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/categories?post=34959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/tags?post=34959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}When is the code detected?<\/div>\nThe Engine Control Module (ECM)<\/a> has detected the sensor 5 volt reference circuit voltage is higher or lower than expected<\/div>\n<\/div>\nCode P0641 Possible causes<\/div>\n– Faulty Engine Control Module (ECM)
\n– ECM harness is open or shorted
\n– ECM circuit poor electrical connection
\n– Shorted sensor on 5 volt circuit<\/p>\nECM – Engine Control Module Replacement 2007 Chevy 1500<\/h3>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"