{"id":17892,"date":"2023-09-21T12:14:04","date_gmt":"2023-09-21T16:14:04","guid":{"rendered":"https:\/\/gm-techlink.com\/?p=17892"},"modified":"2023-09-21T12:14:04","modified_gmt":"2023-09-21T16:14:04","slug":"9-speed-transmission-oil-level-control-system-changes","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=17892","title":{"rendered":"9-Speed Transmission Oil Level Control System Changes"},"content":{"rendered":"

Several changes have been made to the 9-speed transmission (RPO M3W, M3F, M3H, M3G, M3T, M3V, M3U) automatic transmission fluid Oil Level Control system (OLC) for 2023-2024 Enclave, Encore GX, Envision, XT4, XT5, XT6, Blazer, Trailblazer, Traverse, Acadia and Terrain models. The OLC system stores fluid in the side cover as the transmission warms up.<\/p>\n

The OLC system through the 2023 model year consists of a standpipe with a thermal door, on\/off solenoid and valve. For the 2024 model year and some 2023 models equipped with RPO BCE, the following changes have been made to the OLC system.<\/p>\n

TIP<\/strong>: With OLC (w\/OLC) indicates the original design of the OLC system. Without OLC (w\/o OLC) indicates the new design of the OLC system.<\/p>\n

Standpipe Thermal Door<\/strong><\/p>\n

The previous automatic transmission fluid level control valve on the standpipe had a small thermal door. (Fig. 1, #1) The new style has a larger thermal door on the standpipe (Fig. 1, #2), which is necessary for the removal of the OLC components.<\/p>\n

The larger thermal door can be used for any model year while the previous smaller thermal door can be used only on 2022 and earlier models.<\/p>\n

 <\/p>\n

\"\"Fig. 1<\/strong><\/p>\n

 <\/p>\n

Transmission Fluid Valve<\/strong><\/p>\n

The automatic transmission fluid valve has been eliminated on the valve body. (Fig. 2, #2)<\/p>\n

 <\/p>\n

\"\"Fig. 2<\/strong><\/p>\n

 <\/p>\n

Spacer Plate<\/strong><\/p>\n

The valve body-to-transmission case spacer plate is now covering over the port. (Fig. 3, #2)<\/p>\n

 <\/p>\n

\"\"Fig. 3<\/strong><\/p>\n

 <\/p>\n

Transmission Fluid Control Solenoid<\/strong><\/p>\n

The solenoid body no longer has the transmission fluid control solenoid and related wiring. (Fig. 4, #2)<\/p>\n

 <\/p>\n

\"\"Fig. 4<\/strong><\/p>\n

 <\/p>\n

Valve Body Cover<\/strong><\/p>\n

The old and new valve body covers are interchangeable. The new-style valve body cover has a plug that is used during assembly. (Fig. 5, #2) It should not be removed.\u00a0 The old-style valve body does not have the plug.<\/p>\n

 <\/p>\n

\"\"Fig. 5<\/strong><\/p>\n

 <\/p>\n

Using the Correct Parts<\/strong><\/p>\n

During repairs of the 9-speed transmissions, the current valve body (w\/OLC) components can be used in 2023 and earlier model years. The new valve body components should be used starting with 2024 models (w\/o OLC). Be sure to use the correct parts for the model year being repaired.<\/p>\n

In order to facilitate the manufacturing process, some 2024 vehicles may have been built with some old-style components. This is not a concern since the 2024 and 2023 RPO BCE transmission calibration ignores those component inputs.<\/p>\n

For additional information, refer to Bulletin #23-NA-135.<\/p>\n

– Thanks to Mark Kevnick<\/em><\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Several changes have been made to the 9-speed transmission (RPO M3W, M3F, M3H, M3G, M3T, M3V, M3U) automatic transmission fluid Oil Level Control system (OLC) for 2023-2024 Enclave, Encore GX, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[156],"tags":[],"class_list":["post-17892","post","type-post","status-publish","format-standard","hentry","category-2023-september-a"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/17892","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=17892"}],"version-history":[{"count":2,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/17892\/revisions"}],"predecessor-version":[{"id":17897,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/17892\/revisions\/17897"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}