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67 fixes
Why is my diesel truck's DEF system throwing a P20EE code and going into limp mode?
A P20EE code means your selective catalytic reduction (SCR) system detects inefficient NOx conversion, usually from contaminated diesel exhaust fluid (DEF), a…
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Why is my electric delivery van's range dropping significantly in cold weather?
Cold temperatures reduce battery efficiency and increase heating demand, cutting an electric delivery van's range by 20‑40%. Precondition the battery while plugged…
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Why is my heavy-duty diesel truck suddenly burning 20% more fuel than normal?
Sudden 20% fuel economy drop usually means a clogged DPF filter, leaking fuel injector, faulty turbo actuator, or incorrect ECM calibration. Start…
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Why is my heavy-duty diesel truck suddenly getting worse fuel mileage?
A sudden drop in fuel mileage usually means a clogged fuel filter, faulty injectors, low tire pressure, or a malfunctioning EGR system.…
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Why is my heavy-duty diesel truck using more DEF fluid than usual?
Higher DEF consumption usually means the selective catalytic reduction (SCR) system is dosing more fluid to meet NOx limits, often due to…
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Why is my heavy-duty truck burning 20% more diesel fuel than last month?
A sudden 20% fuel economy drop usually means a clogged DPF, leaking injector, low tire pressure, or a stuck-open EGR valve —…
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Why is my heavy-duty truck's alternator not charging the batteries properly?
A heavy-duty truck alternator stops charging when the voltage regulator fails, the serpentine belt slips, or battery cables are corroded, preventing the…
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Why is my heavy-duty truck's alternator not charging the batteries?
Your heavy-duty truck's alternator isn't charging because of worn brushes, a failed voltage regulator, loose or corroded battery cables, a broken drive…
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Why is my heavy-duty truck's DEF system throwing a fault code and derating the engine?
A DEF system fault with engine derate usually means the aftertreatment system detected a problem — like low DEF fluid, a bad…
See the fixWhy is my heavy-duty truck's DPF regenerating every 50 miles?
Your DPF regenerates every 50 miles because excessive soot accumulates too fast, usually from short trips, bad injectors, wrong oil, EGR issues,…
See the fixWhy is my heavy-duty truck's DPF regenerating too often?
Frequent DPF regeneration usually means the filter is clogged with soot from short trips, bad fuel, or a faulty sensor, preventing passive…
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Why won't a heavy-duty truck's batteries hold a charge overnight
Your heavy-duty truck's batteries likely won't hold a charge overnight because of parasitic draws from accessories, a failing alternator, sulfated batteries, or…
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