{"id":832,"date":"2026-07-16T11:53:34","date_gmt":"2026-07-16T11:53:34","guid":{"rendered":"https:\/\/autosmarts.co\/en\/library\/ev-diagnostic-process-checklist\/"},"modified":"2026-10-14T15:31:33","modified_gmt":"2026-10-14T15:31:33","slug":"ev-diagnostic-process-checklist","status":"publish","type":"libraries","link":"https:\/\/autosmarts.co\/en\/library\/ev-diagnostic-process-checklist\/","title":{"rendered":"EV Diagnostic Process Checklist"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">What this checklist covers<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The EV Diagnostic Process Checklist is a 15-point scorecard for diagnostic equipment, fault code reading, battery health checks, software version, charging system testing, and repair approval. Each criterion is scored from 1 to 5 on what the auditor sees on the day, and every gap goes into an action plan with an owner and a close date.<\/p>\n\n\n\n<p class=\"as-chktip wp-block-paragraph\"><strong>AutoSmart tip:<\/strong> EV diagnostic accuracy is directly dependent on software version \u2014 a vehicle running an outdated BMS firmware may present fault codes that have been updated or reclassified in a newer version, leading to unnecessary component replacement or misdiagnosis. Always check and update vehicle software before concluding an EV diagnostic session, and always verify the diagnostic tool software version matches the OEM&#8217;s current requirement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The checks<\/h2>\n\n\n\n<div class=\"wp-block-group as-checks is-layout-flow wp-block-group-is-layout-flow\"><p class=\"as-checks__note\"><span>Tap Yes, No or Maybe to try it: your answers stay in this page and clear when you refresh. For a detailed walkthrough, <a href=\"#get-pdf\">download our PDF<\/a> or <a href=\"https:\/\/autosmarts.co\/en\/book-a-demo\/\" data-as-track=\"demo\">book a demo<\/a>.<\/span><\/p>\n<div class=\"wp-block-group as-checksec is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Diagnostic equipment and software version<\/h3><p class=\"as-checksec__meta\">4 checks<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">01<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the OEM-specified diagnostic tool available at the dealership and capable of communicating with all EV models currently in the service portfolio?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">02<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the diagnostic tool updated to the current software version, with version history confirming updates were applied within the OEM-specified timeframe after each release?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">03<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the vehicle&#039;s software version checked at the start of every EV diagnostic session, with an OTA update applied (or flagged) if the vehicle is running an outdated version that may affect diagnosis accuracy?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">04<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the diagnostic tool calibrated or self-tested as required, with calibration records available and no out-of-date calibration status in active diagnostic use?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group as-checksec is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Fault code reading and battery health check<\/h3><p class=\"as-checksec__meta\">4 checks<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">05<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is a full vehicle scan (all control modules, not only the primary fault system) performed for every EV diagnostic session, capturing all stored and pending fault codes?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">06<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Are fault codes interpreted using the OEM diagnostic database rather than generic code readers, ensuring EV-specific codes are correctly identified and not misattributed to generic system faults?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">07<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is a battery state-of-health (SoH) check performed for all EV diagnostic sessions where a battery-related customer complaint or range concern is reported?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">08<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Are battery cell balance, temperature history, and BMS fault flags reviewed as part of the battery diagnostic, not only the headline SoH percentage?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group as-checksec is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Charging system test<\/h3><p class=\"as-checksec__meta\">3 checks<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">09<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the vehicle&#039;s onboard charger and charging control system tested as part of any diagnostic session involving a charging complaint, using the OEM diagnostic routine for charging system verification?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">10<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the charging port and cable connection inspected physically for damage, contamination, or corrosion as part of every charging-related diagnostic session?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">11<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the vehicle tested on an actual charger (AC and DC where relevant) during the diagnostic session, rather than relying only on static diagnostic data when a real-world charging fault is reported?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group as-checksec is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Root cause analysis and repair approval<\/h3><p class=\"as-checksec__meta\">4 checks<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">12<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is a root cause identified for every EV fault \u2014 distinguishing between software fault, hardware failure, high-voltage system issue, and charging infrastructure problem \u2014 before a repair recommendation is made?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">13<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is the repair recommendation reviewed by a senior technician or team leader for all EV faults involving the high-voltage system, battery, or powertrain before the customer is committed?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">14<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is customer approval obtained for the specific repair recommended \u2014 with the diagnosis, proposed fix, and cost clearly explained \u2014 before any HV system component is disturbed?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n\n\n\n<li class=\"as-check\"><span class=\"as-check__no\" aria-hidden=\"true\">15<\/span><span class=\"as-check__body\"><span class=\"as-check__text\">Is EV diagnostic accuracy tracked through a comeback metric specifically for EV faults, allowing identification of recurring misdiagnosis patterns by model or fault type?<\/span><span class=\"as-check__answer\" role=\"group\" aria-label=\"Your answer\" hidden><button type=\"button\" data-answer=\"yes\" aria-pressed=\"false\">Yes<\/button><button type=\"button\" data-answer=\"no\" aria-pressed=\"false\">No<\/button><button type=\"button\" data-answer=\"maybe\" aria-pressed=\"false\">Maybe<\/button><\/span><\/span><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Covers diagnostic equipment, fault code reading, battery health check, software version, charging system test, root cause analysis, and repair approval.<\/p>\n","protected":false},"template":"","meta":{"footnotes":"","_as_roles":"","_as_frequency":"","_as_standard":"","_as_source":"","_as_pdf":1069,"_as_solution":556,"_as_guide":0,"_as_case_study":0,"_as_lib_featured":false},"industry_tag":[3],"checklist_topic":[22],"checklist_market":[],"class_list":["post-832","libraries","type-libraries","status-publish","hentry","checklist_topic-ev-readiness"],"_links":{"self":[{"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/libraries\/832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/libraries"}],"about":[{"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/types\/libraries"}],"version-history":[{"count":3,"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/libraries\/832\/revisions"}],"predecessor-version":[{"id":1309,"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/libraries\/832\/revisions\/1309"}],"wp:attachment":[{"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/media?parent=832"}],"wp:term":[{"taxonomy":"industry_tag","embeddable":true,"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/industry_tag?post=832"},{"taxonomy":"checklist_topic","embeddable":true,"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/checklist_topic?post=832"},{"taxonomy":"checklist_market","embeddable":true,"href":"https:\/\/autosmarts.co\/en\/wp-json\/wp\/v2\/checklist_market?post=832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}