{"id":1627,"date":"2025-07-09T00:06:31","date_gmt":"2025-07-08T22:06:31","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&#038;p=1627"},"modified":"2026-03-21T02:48:28","modified_gmt":"2026-03-21T01:48:28","slug":"motor-blocked-rattles-st2","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/motor-blockiert-rattert-st2\/","title":{"rendered":"Motor \"stalls\", \"rattles\" (ST2 \/ ST2S)"},"content":{"rendered":"<h3 class=\"wp-block-heading\" id=\"e31c5a12-cae7-467e-a5dd-dfc9b39349b9\">Symptoms<\/h3>\n\n\n\n<ul id=\"ea26c6e5-6229-4c62-8969-0591974d929b\" class=\"wp-block-list\">\n<li>A loud noise, locking of the rear wheel and almost impossible to move.<\/li>\n\n\n\n<li>There is also an unusual rattling noise when braking - if the brake is pulled as far as it will go, there is a noise when it is released and the result is a jerk forwards.<\/li>\n\n\n\n<li>As soon as you accelerate in operating modes 1\/2\/3, it rattles violently and also brakes.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ee3d0d36-5db6-4b28-965e-05fbb5153a80\">Possible cause<\/h3>\n\n\n\n<ul id=\"60e5937e-9447-490b-8b98-cd0db5d103a3\" class=\"wp-block-list\">\n<li>Brake pads broken in the middle and therefore displaced. This causes them to become jammed in the brake calliper and press on the brake disk.<\/li>\n\n\n\n<li>Motor cable defective or solder joint on the plug defective. The problem occurred especially with the ST2 \/ ST2S. The cable runs through the left chain stay and is connected to the controller (MCU = Motor Control Unit) via a plug connection. Before replacing the cable, you should check the solder joints in the HIGO connector. These are often the problem. The part number of the entire cable is&nbsp;<a href=\"https:\/\/shop.stromer-bike.de\/products\/motor-connector-st2?_pos=1&amp;_sid=78a13472a&amp;_ss=r\" target=\"_blank\" rel=\"noreferrer noopener\">221244&nbsp;<\/a>(ST2 \/ ST2S).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">If necessary, you can continue driving at a moderate speed when the fault occurs. Drive slowly, accelerate slowly until the supposed blockage occurs, then reduce speed again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"fe109b0f-75da-4f5f-a003-628282af9433\">The function of the motor can be checked with the SIT (<strong>S<\/strong>ystem\u00a0<strong>I<\/strong>ntegration\u00a0<strong>T<\/strong>est) must be checked.<br><br><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/sit-test-runner-components-test\/\" data-type=\"ht_kb\" data-id=\"822\">See<\/a>\u00a0ELEKTRIK \/ ELEKTRONIK - Testing \/ P\u00fcrfen -\u00a0<em>'SIT (Test Runner) - Testing components'<\/em><br><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/e-21020e-support-problems\/\">See<\/a> also ERROR MESSAGES \/ WARNINGS -<em>'E 21020E | Support problems'<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Symptome M\u00f6gliche Ursache Der Motor kann auf seine Funktion mit dem SIT (System\u00a0Integration\u00a0Test) gepr\u00fcft werden. Siehe\u00a0ELEKTRIK \/ ELEKTRONIK &#8211; Testen \/ P\u00fcrfen &#8211;\u00a0&#8218;SIT (Test Runner) &#8211; Komponenten testen&#8216;Siehe auch FEHLERMELDUNGEN \/ WARNUNGEN &#8211;&#8218;E 21020E | Unterst\u00fctzungsprobleme&#8216;<\/p>","protected":false},"author":1,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[206],"ht-kb-tag":[],"class_list":["post-1627","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-p-motor"],"_links":{"self":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/comments?post=1627"}],"version-history":[{"count":7,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1627\/revisions"}],"predecessor-version":[{"id":10102,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1627\/revisions\/10102"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=1627"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=1627"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=1627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}