{"id":78058,"date":"2025-08-24T12:36:26","date_gmt":"2025-08-24T17:36:26","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78058"},"modified":"2025-08-24T12:36:26","modified_gmt":"2025-08-24T17:36:26","slug":"p0698-obd2-sensor-reference-voltage-c-circuit-low","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0698-obd2-sensor-reference-voltage-c-circuit-low","title":{"rendered":"P0698 OBD2: Sensor Reference Voltage &#8220;C&#8221; Circuit Low"},"content":{"rendered":"<h2>What Does the P0698 Code Mean?<\/h2>\n<p>OBD-II Code P0698 is defined as a Sensor Reference Voltage &#8220;C&#8221; Circuit Low. This code indicates that the engine control module (PCM) has detected an issue with the 5-volt reference signal sent to various engine sensors.<\/p>\n<h2>What Causes the P0698 Code?<\/h2>\n<p>The P0698 code is triggered when the PCM identifies a problem with the reference voltage signal. Potential causes include:<\/p>\n<ul>\n<li>Engine sensor failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues related to the sensor reference circuit<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0698 Code?<\/h2>\n<p>Symptoms associated with the P0698 code may include:<\/p>\n<ul>\n<li>Engine may not start<\/li>\n<\/ul>\n<p>Note that the same symptom may also be caused by other issues.<\/p>\n<h2>How Serious Is the P0698 Code?<\/h2>\n<p>This code has a moderate severity level. While it may not pose an immediate threat to the vehicle&#8217;s safety or functionality, it is advisable to have it diagnosed within a reasonable timeframe to prevent further complications.<\/p>\n<h2>How to Diagnose the P0698 Code<\/h2>\n<p>To properly diagnose the P0698 code, a mechanic will typically:<\/p>\n<ul>\n<li>Use an OBD-II scanner to verify the code and check for any related codes.<\/li>\n<li>Inspect the wiring and connectors related to the sensor reference voltage circuit.<\/li>\n<li>Test the output voltage from the PCM and the affected sensors.<\/li>\n<li>Check for any signs of shorts or opens in the circuit.<\/li>\n<\/ul>\n<h2>Common Repairs for the P0698 Code<\/h2>\n<p>Repairs for the P0698 code may include:<\/p>\n<ul>\n<li>Replacing faulty engine sensors<\/li>\n<li>Repairing wiring issues<\/li>\n<li>Replacing or reprogramming the Powertrain Control Module (PCM)<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0698 Code?<\/h2>\n<p>The cost of fixing the P0698 code can vary widely based on the underlying issue:<\/p>\n<ul>\n<li>Sensor replacement can range from $100 to $300.<\/li>\n<li>Wiring repairs may cost between $50 and $150.<\/li>\n<li>PCM replacement or reprogramming may go from $200 to $1,000 depending on the vehicle.<\/li>\n<\/ul>\n<h2>Can I Fix the P0698 Code Myself?<\/h2>\n<p>If you have experience with automotive repairs, you may be able to diagnose and fix minor wiring issues or replace a faulty sensor yourself. However, for PCM-related problems or if you&#8217;re unsure, it\u2019s recommended to consult a professional mechanic.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does the P0698 Code Mean? OBD-II Code P0698 is defined as a Sensor Reference Voltage &#8220;C&#8221; Circuit Low. This code indicates that the engine control module (PCM) has detected an issue with the 5-volt reference signal sent to various engine sensors. What Causes the P0698 Code? The P0698 code is triggered when the PCM &hellip;<\/p>\n","protected":false},"author":26,"featured_media":93640,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-78058","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P0698 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0698 code, what causes Sensor Reference Voltage &quot;C&quot; Circuit Low, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\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.emanualonline.com\/blog\/p0698-obd2-sensor-reference-voltage-c-circuit-low\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0698 OBD2: Sensor Reference Voltage &quot;C&quot; Circuit Low\" \/>\n<meta property=\"og:description\" content=\"What Does the P0698 Code Mean? OBD-II Code P0698 is defined as a Sensor Reference Voltage &quot;C&quot; Circuit Low. This code indicates that the engine control\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0698-obd2-sensor-reference-voltage-c-circuit-low\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-24T17:36:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0698-obd2-sensor-reference-voltage-c-circuit-low.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0698-obd2-sensor-reference-voltage-c-circuit-low#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0698-obd2-sensor-reference-voltage-c-circuit-low\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0698 OBD2: Sensor Reference Voltage &#8220;C&#8221; 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OBD-II Code P0698 is defined as a Sensor Reference Voltage &#8220;C&#8221; Circuit Low. This code indicates that the engine control module (PCM) has detected an issue with the 5-volt reference signal sent to various engine sensors. What Causes the P0698 Code? The P0698 code is triggered when the PCM&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78058","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/comments?post=78058"}],"version-history":[{"count":1,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78058\/revisions"}],"predecessor-version":[{"id":84757,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78058\/revisions\/84757"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/93640"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=78058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=78058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=78058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}