[ad_1] <br><img src="https://cdn-fastly.thetruthaboutcars.com/media/2025/08/13/16381/epa-doing-away-with-diesel-exhaust-fluid-power-restrictions-by-2027.jpg?size=720x845&nocrop=1" /><br><div> <head> <link type="text/css" rel="stylesheet" href="https://www.thetruthaboutcars.com/resources/combined/css/rapid-post-page.e12e96654c9381ed0f7abbc52423ee32.9014.css"/> <link type="text/css" rel="stylesheet" href="https://www.thetruthaboutcars.com/resources/combined/css/vscope.435441d71ad13cf21a894014e88ac40d.9014.css"/> <link type="text/css" rel="stylesheet" href="https://www.thetruthaboutcars.com/resources/combined/css/vscope-ttac.f69f00a8dc6acfe434e1c2f4ae346f24.9014.css"/> <meta charset="utf-8"/> <title>EPA Doing Away With Diesel Exhaust Fluid Power Restrictions By 2027 | The Truth About Cars</title> <meta name="description" content=" Environmental Protection Agency (EPA) Administrator Lee Zeldin has announced plans to eliminate restrictions placed on diesel-equipped vehicles when they run…"/> <meta property="og:title" content="EPA Doing Away With Diesel Exhaust Fluid Power Restrictions By 2027"/> <meta property="og:description" content=" Environmental Protection Agency (EPA) Administrator Lee Zeldin has announced plans to eliminate restrictions placed on diesel-equipped vehicles when they run out of diesel exhaust fluid (DEF). Starting with model year 2027, the EPA wants manufacturers to do away with power limitations imposed whenever diesel trucks start running out of DEF. It likewise plans on working with automakers to create software changes that can be made to existing vehicles that would undo emissions-based…"/> <meta property="og:image" content="https://cdn-fastly.thetruthaboutcars.com/media/2025/08/13/16381/social-45130336.jpg?size=1200x628"/> <meta property="og:url" content="https://www.thetruthaboutcars.com/cars/news-blog/epa-doing-away-with-diesel-exhaust-fluid-power-restrictions-by-2027-45130336"/> <meta property="article:author" content="Matt Posky"/> <meta property="article:published_time" content="2025-08-13T17:00:00-04:00"/> <meta property="article:modified_time" content="2025-08-13T17:00:00-04:00"/> <link rel="canonical" href="https://www.thetruthaboutcars.com/cars/news-blog/epa-doing-away-with-diesel-exhaust-fluid-power-restrictions-by-2027-45130336"/> <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1"/> <link href="https://www.thetruthaboutcars.com/resources/combined/js/load-libraries.e7d99c7673ce99818c690b6c768e801e.9014.js" rel="preload" as="script"/> <link href="https://www.thetruthaboutcars.com/resources/combined/js/rapid-activity.e7ae2e3f206d6ce4dfb1.9014.js" rel="preload" as="script"/> <link href="https://gFG6dfy8zMK7D3vZp.ay.delivery/s2s-client-v1.js" rel="preload" as="script"/> <link href="https://www.thetruthaboutcars.com/resources/combined/js/prebid-new-full.966fff4d04b30e126a862df5ee90d981.9014.js" rel="preload" as="script"/> <link rel="preconnect" href="https://www-direct.thetruthaboutcars.com"/> <link rel="preconnect" href="https://aax.amazon-adsystem.com"/> <link rel="dns-prefetch" href="https://ib.adnxs.com/"/> <link rel="dns-prefetch" href="https://tagan.adlightning.com/"/> <link rel="dns-prefetch" href="https://direct.adsrvr.org/"/> <link rel="dns-prefetch" href="https://tlx.3lift.com/"/> <link rel="dns-prefetch" href="https://cdn.jsdelivr.net"/> <!-- Preload fonts --> <link rel="preconnect" href="https://securepubads.g.doubleclick.net"/> <link rel="manifest" href="https://www.thetruthaboutcars.com/manifest/ttac/manifest.json"/> <base href="https://www.thetruthaboutcars.com/"/> <meta http-equiv="Content-Type" content="text/html; 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