{"id":511307,"date":"2022-07-22T22:33:34","date_gmt":"2022-07-23T02:33:34","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/"},"modified":"2026-08-24T22:43:11","modified_gmt":"2026-08-25T02:43:11","slug":"1991-cadillac-deville-problems-reliability","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/","title":{"rendered":"1991 Cadillac Deville Problems &#038; Reliability"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[450,258],"tags":[348,66,756],"class_list":["post-511307","post","type-post","status-publish","format-standard","hentry","category-cadillac","category-car","tag-348","tag-cadillac","tag-deville"],"acf":{"sku":"","year":"","make":"","model":"","post_title":"","featured_image":null,"introduction":"","what_is_pcm_programming":"","signs_your_year_make_model_needs_pcm_programming":"","product_title":"","product_view_link":"","how_pcm_programming_works_for_year_make_model":"","engine_size":"","engine_size_1_url":"","engine_size_2":"","engine_size_2_url":"","description":"When it comes to classic American luxury cars, the 1991 Cadillac DeVille often stands out as a symbol of opulence and comfort from a bygone era. For many, it evokes memories of cruising down the highway in a vehicle that epitomized the height of automotive elegance in the early '90s. However, like any classic car, the 1991 DeVille is not without its quirks and challenges. As enthusiasts and potential buyers look to explore this iconic model, understanding its common problems and reliability issues becomes crucial. Whether you're a nostalgic car lover or someone considering adding this classic to your collection, knowing what to expect can help you make an informed decision.\n\nIn this blog post, we'll delve into the most common problems associated with the 1991 Cadillac DeVille, from engine and transmission issues to electrical and suspension concerns. We'll also explore the overall reliability of this model, providing insights into what makes it a beloved choice for some and a challenging endeavor for others. By the end of this read, you'll have a clearer picture of what owning a 1991 DeVille entails, helping you weigh the pros and cons of investing in this piece of automotive history. Whether you're reminiscing about the past or contemplating a purchase, this guide aims to equip you with the knowledge needed to navigate the world of classic Cadillacs.","body_reported_problems":"<p>N\/A<\/p>","body_analysis":"<p>No major Body Components problems have been reported for the 1991 Cadillac Deville.<\/p>","brake_system_reported_problems":"<p>N\/A<\/p>","brake_system_analysis":"<p>No major Brake System problems have been reported for the 1991 Cadillac Deville.<\/p>","heating_&_cooling_reported_problems":"<p>N\/A<\/p>","heating_&_cooling_analysis":"<p>No major Heating & Cooling problems have been reported for the 1991 Cadillac Deville.<\/p>","drivetrain_reported_problems":"<ul><li>Electrical Level Ride System May Fail<\/li><\/ul>","drivetrain_reported_analysis":"<p>The 1991 Cadillac Deville's Electrical Level Ride System has been known to experience failures, which can affect the vehicle's overall ride comfort and handling. While this issue is a notable concern, it's important to consider it alongside other factors when evaluating the car's overall reliability. If you're considering this model, it might be worth checking if this system has been serviced or replaced.<\/p>","interior_electronics_reported_problems":"<p>N\/A<\/p>","interior_electronics_analysis":"<p>No major Interior Electronics problems have been reported for the 1991 Cadillac Deville.<\/p>","cooling_system_reported_problems":"<p>N\/A<\/p>","cooling_system_analysis":"<p>No major Cooling System problems have been reported for the 1991 Cadillac Deville.<\/p>","ignition_&_wiring_reported_problems":"<p>N\/A<\/p>","ignition_&_wiring_analysis":"<p>No major Ignition & Wiring problems have been reported for the 1991 Cadillac Deville.<\/p>","engine_repairs_reported_problems":"<p>N\/A<\/p>","engine_repairs_analysis":"<p>No major Engine Repairs problems have been reported for the 1991 Cadillac Deville.<\/p>","exhaust_system_reported_problems":"<p>N\/A<\/p>","exhaust_system_analysis":"<p>No major Exhaust System problems have been reported for the 1991 Cadillac Deville.<\/p>","fuel_&_emissions_reported_problems":"<p>N\/A<\/p>","fuel_&_emissions_analysis":"<p>No major Fuel & Emissions problems have been reported for the 1991 Cadillac Deville.<\/p>","onboard_electronics_reported_problems":"<p>N\/A<\/p>","onboard_electronics_analysis":"<p>No major Onboard & Powertrain Control Electronics problems have been reported for the 1991 Cadillac Deville.<\/p>","strange_sounds_&_leaks_reported_problems":"<p>N\/A<\/p>","strange_sounds_&_leaks_analysis":"<p>No major Strange Sounds & Leaks problems have been reported for the 1991 Cadillac Deville.<\/p>","exterior_finish_reported_problems":"<p>N\/A<\/p>","exterior_finish_analysis":"<p>No major Exterior Finish problems have been reported for the 1991 Cadillac Deville.<\/p>","suspension_&_steering_reported_problems":"<p>N\/A<\/p>","suspension_&_steering_analysis":"<p>No major Suspension & Steering problems have been reported for the 1991 Cadillac Deville.<\/p>","transmission_repairs_reported_problems":"<p>N\/A<\/p>","transmission_repairs_analysis":"<p>No major Transmission Repairs problems have been reported for the 1991 Cadillac Deville.<\/p>","conclusion":"","image":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>1991 Cadillac Deville Problems &amp; Reliability<\/title>\n<meta name=\"description\" content=\"1991 Cadillac Deville reliability overview and engine computer (PCM\/ECM) warning signs to watch for.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1991 Cadillac Deville Problems &amp; Reliability\" \/>\n<meta property=\"og:description\" content=\"1991 Cadillac Deville reliability overview and engine computer (PCM\/ECM) warning signs to watch for.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/\" \/>\n<meta property=\"og:site_name\" content=\"Flagship One Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/flagshipone\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/flagshipone\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-23T02:33:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-25T02:43:11+00:00\" \/>\n<meta name=\"author\" content=\"FlagshipOne\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:site\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"FlagshipOne\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"1991 Cadillac Deville Problems &#038; Reliability\",\"datePublished\":\"2022-07-23T02:33:34+00:00\",\"dateModified\":\"2026-08-25T02:43:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/\"},\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"keywords\":[\"1991\",\"Cadillac\",\"Deville\"],\"articleSection\":[\"Cadillac\",\"Car\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/\",\"name\":\"1991 Cadillac Deville Problems & Reliability\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\"},\"datePublished\":\"2022-07-23T02:33:34+00:00\",\"dateModified\":\"2026-08-25T02:43:11+00:00\",\"description\":\"1991 Cadillac Deville reliability overview and engine computer (PCM\\\/ECM) warning signs to watch for.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-cadillac-deville-problems-reliability\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"1991 Cadillac Deville Problems &#038; Reliability\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"name\":\"Flagship One Blog\",\"description\":\"Flagship One Inc. OEM Engine Computers  Control Modules\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\",\"name\":\"Flagship One, Inc.\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"width\":1341,\"height\":1098,\"caption\":\"Flagship One, Inc.\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/flagshipone\",\"https:\\\/\\\/x.com\\\/theflagshipone\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UC0oyKphffBM2qkJ-gKPmMXw\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\",\"name\":\"FlagshipOne\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"caption\":\"FlagshipOne\"},\"description\":\"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.\",\"sameAs\":[\"https:\\\/\\\/www.fs1inc.com\\\/\",\"https:\\\/\\\/www.facebook.com\\\/flagshipone\\\/\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/fs1inc\"],\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/author\\\/flagship1inc\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"1991 Cadillac Deville Problems & Reliability","description":"1991 Cadillac Deville reliability overview and engine computer (PCM\/ECM) warning signs to watch for.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/","og_locale":"en_US","og_type":"article","og_title":"1991 Cadillac Deville Problems & Reliability","og_description":"1991 Cadillac Deville reliability overview and engine computer (PCM\/ECM) warning signs to watch for.","og_url":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/","og_site_name":"Flagship One Blog","article_publisher":"https:\/\/www.facebook.com\/flagshipone","article_author":"https:\/\/www.facebook.com\/flagshipone\/","article_published_time":"2022-07-23T02:33:34+00:00","article_modified_time":"2026-08-25T02:43:11+00:00","author":"FlagshipOne","twitter_card":"summary_large_image","twitter_creator":"@theflagshipone","twitter_site":"@theflagshipone","twitter_misc":{"Written by":"FlagshipOne"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/#article","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/"},"author":{"name":"FlagshipOne","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700"},"headline":"1991 Cadillac Deville Problems &#038; Reliability","datePublished":"2022-07-23T02:33:34+00:00","dateModified":"2026-08-25T02:43:11+00:00","mainEntityOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/"},"commentCount":0,"publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"keywords":["1991","Cadillac","Deville"],"articleSection":["Cadillac","Car"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/","url":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/","name":"1991 Cadillac Deville Problems & Reliability","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/#website"},"datePublished":"2022-07-23T02:33:34+00:00","dateModified":"2026-08-25T02:43:11+00:00","description":"1991 Cadillac Deville reliability overview and engine computer (PCM\/ECM) warning signs to watch for.","breadcrumb":{"@id":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.fs1inc.com\/blog\/1991-cadillac-deville-problems-reliability\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fs1inc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"1991 Cadillac Deville Problems &#038; Reliability"}]},{"@type":"WebSite","@id":"https:\/\/www.fs1inc.com\/blog\/#website","url":"https:\/\/www.fs1inc.com\/blog\/","name":"Flagship One Blog","description":"Flagship One Inc. OEM Engine Computers  Control Modules","publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.fs1inc.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.fs1inc.com\/blog\/#organization","name":"Flagship One, Inc.","url":"https:\/\/www.fs1inc.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","contentUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","width":1341,"height":1098,"caption":"Flagship One, Inc."},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/flagshipone","https:\/\/x.com\/theflagshipone","https:\/\/www.instagram.com\/flagship_one","https:\/\/www.youtube.com\/channel\/UC0oyKphffBM2qkJ-gKPmMXw"]},{"@type":"Person","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700","name":"FlagshipOne","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","caption":"FlagshipOne"},"description":"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.","sameAs":["https:\/\/www.fs1inc.com\/","https:\/\/www.facebook.com\/flagshipone\/","https:\/\/www.instagram.com\/flagship_one\/","https:\/\/www.linkedin.com\/company\/fs1inc"],"url":"https:\/\/www.fs1inc.com\/blog\/author\/flagship1inc\/"}]}},"_links":{"self":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/511307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/comments?post=511307"}],"version-history":[{"count":1,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/511307\/revisions"}],"predecessor-version":[{"id":514289,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/511307\/revisions\/514289"}],"wp:attachment":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/media?parent=511307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/categories?post=511307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/tags?post=511307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}