One moment you’re cruising down the road—next thing you know, your truck won’t go faster than 5 MPH. This is called a derate, and it’s your truck’s way of saying: “Fix the problem or I’m shutting down.”
If you’ve ever been stuck on the side of the road crawling to a safe spot, you know how costly and frustrating this is. The good news? Most derates are preventable—and fixable—if you have the right tools.
⚠️ What Is a 5 MPH Derate?
A derate is when your truck's engine control module (ECM) limits performance due to a serious fault. A 5 MPH derate is the most severe—it keeps you from driving until you fix the issue.
Common causes:
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SPN 5246 – Emissions system fault
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SPN 3719 – DPF soot level too high
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SPN 4364 – NOx sensor failed
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Failed or skipped regen cycles
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EGR or DEF system issues
🧯 Can You Clear It?
Yes—but only after the root problem is resolved. That usually means:
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Running a forced regen
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Replacing a failed sensor (NOx, DEF, temp, etc.)
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Resetting the derate after repair
But here’s the catch: You can’t do it without the right diagnostic tool.
🛠 The Tool That Can Get You Back on the Road
Our Diesel Diagnostic Laptop Scanner Kit gives you full dealer-level access to:
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Clear 5 MPH derates and limp mode conditions
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Run and monitor forced regens
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Read SPN/FMI fault codes
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Reset EGR, SCR, and DPF systems after repair
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Test components (NOx, DEF, EGR, Turbo, etc.)
No subscriptions. No waiting. No towing.
💰 Save Time, Save Money
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Avoid $1,000+ tow bills
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No more waiting 3–5 days for dealer appointments
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Fix and reset on your own schedule—even on the side of the road
✅ Why Drivers Choose DieselScanners.com
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Preloaded laptop + adapter = plug & play
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Works with Cummins, Detroit, Volvo, Paccar, CAT, MaxxForce, and more
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2-year warranty
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30-day full refund guarantee (we pay return shipping)
👉 Don’t let a derate stop your income—get your diesel laptop scanner now