Imagine a fully loaded semi carrying groceries suddenly being forced to crawl at five miles per hour. Not because the engine failed. Not because the driver ignored a flat tire. Because a government-mandated emissions system detected a Diesel Exhaust Fluid fault and ordered the truck into “limp mode.” President Trump’s EPA is now moving to end that penalty entirely. The agency says its proposed rewrite of the Biden-era heavy-duty truck rule would save American truckers $12 billion, cut the cost of a new truck by as much as $6,000, and help lower the cost of nearly everything those trucks deliver. BREAKING: The Trump EPA is proposing to fix the last administration's unworkable truck rule — saving truckers $12B, up to $6,000 per new truck. Lower costs for truckers means lower prices for your family, and more consumer choice. https://t.co/jhpTVP1pmb — U.S. EPA (@EPA) July 9, 2026 This is one of those Washington stories that sounds technical until the bill lands in your shopping cart. Every regulation that makes a rig more expensive, less reliable, or slower to repair becomes another cost attached to food, medicine, building materials, farm supplies, and household goods. According to the EPA’s July 9 announcement, Administrator Lee Zeldin has proposed revising compliance requirements created under the Biden administration’s 2023 heavy-duty engine rule. The biggest change would completely eliminate forced engine deratements and speed restrictions for newly manufactured highway diesel engines, trucks, and nonroad equipment such as farm machinery. Instead of automatically choking a truck or tractor down when a DEF system reports a problem, the equipment would give the operator a visible or audible warning. The driver could keep moving and address the fault at a safe time and place. The agency estimates the package would save the trucking industry roughly $12 billion. EPA says the savings could reach $6,000 on each new truck, before counting the productivity recovered when drivers and farmers are no longer stranded by sudden power loss. The proposal also scales back emissions-warranty requirements that EPA identified as the largest single cost imposed on the industry by the 2023 rule. Manufacturers would receive more time before longer regulatory useful-life requirements take effect, allowing them to test new technology under real-world conditions. There is an important detail here: EPA is not proposing to erase the underlying nitrogen oxide standard. The agency says the rewritten framework would preserve nearly 90% of the planned NOx reductions while stripping away costs and compliance mechanisms it considers unworkable. That is the part the usual “Trump is destroying clean air” headline will probably leave out. At the Great American State Fair, I just announced a proposed roll back of the Biden admin's overburdensome truck emission rules. This proposal, which includes a permanent and total elimination of Diesel Exhaust Fluid (DEF) deratements, would save American truckers $12 billion.… — Lee Zeldin (@epaleezeldin) July 9, 2026 The proposal is not final yet. The official EPA rule page identifies the action as a proposed amendment covering model year 2027 and later heavy-duty highway engines, along with DEF-related requirements for newly manufactured highway and nonroad diesel equipment. The docket number is EPA-HQ-OAR-2026-0728. EPA says the proposal would revise warranty periods, delay some useful-life requirements, correct existing compliance provisions, and make nonconformance penalties available for certain manufacturers that need more time to meet the new standards. Those penalties are intended to let truck and engine sales continue during the transition without rewarding companies that are already in compliance or turning the delay into a permanent escape hatch. The same proposal would replace mandatory derates with warnings on new equipment. EPA is also considering guidance that could let manufacturers extend compatible changes to trucks, tractors, and other diesel equipment already in use. The agency announced a 45-day public comment period and public hearings before a final rule can be issued. That distinction matters: the relief has been formally proposed, but it has not yet become the final federal standard. Now to the maddening part: what “deratement” actually means outside a federal rulebook. Diesel Exhaust Fluid is injected into the exhaust stream to reduce nitrogen oxide emissions. The fluid and its sensors are part of a selective catalytic reduction system used on most modern diesel trucks and much heavy farm and construction equipment. When the system detects an empty tank, a sensor error, or another fault, the vehicle can be programmed to reduce engine power and speed. The idea was to force a quick repair. The practical result could be a massive machine that still runs but is deliberately made nearly useless. Today, the Trump EPA proposed eliminating DEF deratements entirely as part of commonsense revisions to the last Administration’s heavy-duty NOx rule. The proposal builds on EPA’s ongoing efforts to help address DEF system failures—from reversing unnecessary deratements and… pic.twitter.com/EQALjdeFQR — U.S. EPA (@EPA) July 9, 2026 EPA documented the scale of that problem months before unveiling this proposal. In a February review of DEF failures, the agency said some trucks were reduced to as little as five miles per hour within hours of a fault. EPA demanded warranty, repair, and failure-rate data from 14 major manufacturers that account for more than 80% of the products used in DEF systems. The agency said it wanted to determine whether failures were concentrated in particular model years or product generations. Earlier guidance had already softened the most immediate shutdowns. Trucks were supposed to receive a warning period before a mild derate, followed by substantially more time and distance before a 25-mph restriction could take effect. That was a temporary pressure release. The July proposal goes much further by seeking to remove the deratement requirement from newly manufactured equipment altogether. It also follows separate actions recognizing farmers’ right to repair faulty emissions systems and allowing different sensor configurations intended to reduce false failures. The original rule’s public-health case should be stated honestly, too. When the Biden EPA announced the heavy-duty standards in December 2022, it projected major reductions in smog- and soot-forming pollution beginning with model year 2027. The agency estimated that the rule could eventually prevent thousands of premature deaths and hospital visits, particularly in communities near freight routes. It also increased regulatory useful-life periods and extended emissions warranties, arguing that older trucks should continue meeting stricter standards as they age. At the time, EPA described the standards as more than 80% stronger than the previous requirements and said the new warranties would be several times longer. The rule also required manufacturers to demonstrate that engines were designed to prevent tampering with pollution controls. Those are serious goals. They do not make every enforcement mechanism wise, affordable, or safe. A compliance system that can turn an otherwise operable semi into a five-mile-per-hour road hazard deserves scrutiny. A warranty mandate that adds billions in cost deserves scrutiny. And a deadline that manufacturers repeatedly warned they could not meet deserves scrutiny before it creates a shortage of new trucks. The Trump administration’s proposal attempts to separate the environmental target from the bureaucratic punishment: retain most of the projected NOx reduction, remove the forced limp mode, lower warranty costs, and give manufacturers enough time to build equipment that works. That is what practical deregulation looks like. Truckers do not operate in a separate economy. They are the circulatory system of this one. When Washington makes every truck cost more, every American pays. When a failed sensor can park a rig or cripple a tractor during harvest, the damage does not stop with the driver or farmer. This proposal still has to survive public comment and the final rulemaking process. But the direction is unmistakable: a warning light should warn you. It should not seize control of a working machine and leave the bill with the American people. The EPA’s full 477-page proposed rule spells out exactly how the administration plans to make that change. The signed prepublication document covers model year 2027 and later heavy-duty highway engines, as well as DEF inducement rules for newly manufactured highway vehicles and nonroad diesel equipment. It includes light- and medium-duty diesel vehicles, heavy-duty engines, tractors, and other equipment that uses selective catalytic reduction systems. It proposes changes to emissions-warranty periods, regulatory useful-life requirements, testing provisions, and the penalties available when certain engine manufacturers temporarily cannot meet the new standard. The document also replaces mandatory power and speed reductions with visible or audible alerts. It opens the door to future guidance for modifying compatible equipment already on the road or in the field. Comments are due by August 29, 2026, and virtual public hearings are scheduled for July 29 and July 30. The docket number for public participation is EPA-HQ-OAR-2026-0728. The public document also identifies the manufacturers and equipment sectors that could be affected, including heavy trucks, farm machinery, and construction equipment. That is where the proposal stands tonight: signed, public, and headed into the rulemaking process with $12 billion and America’s supply chain riding on the outcome. This is a Guest Post from our friends over at WLTReport. View the original article here. The post BREAKING: President Trump’s EPA Moves To END “Limp Mode” Truck Rule, Save Truckers $12 BILLION appeared first on 100PercentFedUp.com.