{"title":"Common Issues with the Cummins 6.7 Turbocharger — and Why You Should Go Non-VGT","description":"\u003cp data-end=\"632\" data-start=\"346\"\u003eThe 6.7L Cummins is known for its power, reliability, and towing capacity — but one of its most common weak points is the factory \u003cstrong data-end=\"509\" data-start=\"476\"\u003evariable geometry turbo (VGT)\u003c\/strong\u003e. Many owners experience turbo failures well before they expect them, leading to costly repairs and frustrating downtime.\u003c\/p\u003e\n\u003cp data-end=\"656\" data-start=\"634\"\u003eThis article covers:\u003c\/p\u003e\n\u003cul data-end=\"827\" data-start=\"657\"\u003e\n\u003cli data-end=\"718\" data-start=\"657\"\u003e\n\u003cp data-end=\"718\" data-start=\"659\"\u003e\u003cstrong data-end=\"716\" data-start=\"659\"\u003eThe most common issues with the Cummins 6.7 VGT turbo\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"762\" data-start=\"719\"\u003e\n\u003cp data-end=\"762\" data-start=\"721\"\u003e\u003cstrong data-end=\"760\" data-start=\"721\"\u003eHow to troubleshoot a failing turbo\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"827\" data-start=\"763\"\u003e\n\u003cp data-end=\"827\" data-start=\"765\"\u003e\u003cstrong data-end=\"825\" data-start=\"765\"\u003eWhy a non-VGT solution (S300\/S400) is often the best fix\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"832\" data-start=\"829\"\u003e\n\u003ch2 data-end=\"886\" data-start=\"834\"\u003eCommon Issues with the 6.7 Cummins VGT Turbo\u003c\/h2\u003e\n\u003ch3 data-end=\"915\" data-start=\"888\"\u003e1. \u003cstrong data-end=\"913\" data-start=\"895\"\u003eSticking Vanes\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-end=\"1037\" data-start=\"916\"\u003eThe internal vanes get clogged with soot, causing sluggish spool, poor boost control, and trouble codes (P003A, P2563).\u003c\/p\u003e\n\u003ch3 data-end=\"1069\" data-start=\"1039\"\u003e2. \u003cstrong data-end=\"1067\" data-start=\"1046\"\u003eActuator Failures\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-end=\"1215\" data-start=\"1070\"\u003eThe electronic actuator is a well-known failure point. When it quits, the turbo can’t adjust vanes, leading to limp mode and expensive repairs.\u003c\/p\u003e\n\u003ch3 data-end=\"1261\" data-start=\"1217\"\u003e3. \u003cstrong data-end=\"1259\" data-start=\"1224\"\u003eHigh Repair \u0026amp; Replacement Costs\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-end=\"1387\" data-start=\"1262\"\u003eOEM replacements are pricey and suffer from the same design flaws — meaning you might be paying for the same problem twice.\u003c\/p\u003e\n\u003ch3 data-end=\"1420\" data-start=\"1389\"\u003e4. \u003cstrong data-end=\"1418\" data-start=\"1396\"\u003eHeat \u0026amp; Soot Issues\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-end=\"1559\" data-start=\"1421\"\u003eThe VGT design is prone to heat soak and soot buildup, especially on emissions-equipped trucks, reducing reliability and turbo lifespan.\u003c\/p\u003e\n\u003ch3 data-end=\"1598\" data-start=\"1561\"\u003e5. \u003cstrong data-end=\"1596\" data-start=\"1568\"\u003eInconsistent Performance\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-end=\"1728\" data-start=\"1599\"\u003eBecause the VGT depends on electronics, performance can fluctuate — resulting in laggy throttle response or inconsistent boost.\u003c\/p\u003e\n\u003chr data-end=\"1733\" data-start=\"1730\"\u003e\n\u003ch2 data-end=\"1770\" data-start=\"1735\"\u003eTroubleshooting a Bad Turbo\u003c\/h2\u003e\n\u003cp data-end=\"1863\" data-start=\"1772\"\u003eBefore swapping your turbo, here are common symptoms that may confirm the VGT is failing:\u003c\/p\u003e\n\u003cul data-end=\"2454\" data-start=\"1865\"\u003e\n\u003cli data-end=\"1955\" data-start=\"1865\"\u003e\n\u003cp data-end=\"1955\" data-start=\"1867\"\u003e\u003cstrong data-end=\"1894\" data-start=\"1867\"\u003eExcessive Exhaust Smoke\u003c\/strong\u003e — Blue smoke = oil leak, black smoke = poor boost\/airflow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2050\" data-start=\"1956\"\u003e\n\u003cp data-end=\"2050\" data-start=\"1958\"\u003e\u003cstrong data-end=\"1988\" data-start=\"1958\"\u003eWhining or Grinding Noises\u003c\/strong\u003e — A failing bearing will often sound like a siren or whine.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2149\" data-start=\"2051\"\u003e\n\u003cp data-end=\"2149\" data-start=\"2053\"\u003e\u003cstrong data-end=\"2073\" data-start=\"2053\"\u003eSlow or No Boost\u003c\/strong\u003e — Truck feels sluggish, especially under load, and boost gauge stays low.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2249\" data-start=\"2150\"\u003e\n\u003cp data-end=\"2249\" data-start=\"2152\"\u003e\u003cstrong data-end=\"2182\" data-start=\"2152\"\u003eCheck Engine Light \u0026amp; Codes\u003c\/strong\u003e — Look for turbo actuator or vane position codes (P003A, P0046).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2356\" data-start=\"2250\"\u003e\n\u003cp data-end=\"2356\" data-start=\"2252\"\u003e\u003cstrong data-end=\"2278\" data-start=\"2252\"\u003eOil Leaks Around Turbo\u003c\/strong\u003e — Oil in compressor housing or downpipe is a sign of internal seal failure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2454\" data-start=\"2357\"\u003e\n\u003cp data-end=\"2454\" data-start=\"2359\"\u003e\u003cstrong data-end=\"2392\" data-start=\"2359\"\u003eHigh EGTs \u0026amp; Poor Fuel Economy\u003c\/strong\u003e — Overworked turbo leads to excessive heat and wasted fuel.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote data-end=\"2641\" data-start=\"2456\"\u003e\n\u003cp data-end=\"2641\" data-start=\"2458\"\u003e\u003cstrong data-end=\"2470\" data-start=\"2458\"\u003ePro Tip:\u003c\/strong\u003e If you’re seeing any of these issues, inspect the actuator first — many failures are electrical and can be confirmed with a scan tool before replacing the entire turbo.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr data-end=\"2646\" data-start=\"2643\"\u003e\n\u003ch2 data-end=\"2688\" data-start=\"2648\"\u003e🔧 Why Go Non-VGT (Fixed Geometry)?\u003c\/h2\u003e\n\u003cp data-end=\"2818\" data-start=\"2690\"\u003eSwitching to a \u003cstrong data-end=\"2729\" data-start=\"2705\"\u003efixed-geometry turbo\u003c\/strong\u003e like an S300 or S400 is a popular solution that addresses all of the VGT’s weaknesses:\u003c\/p\u003e\n\u003cul data-end=\"3160\" data-start=\"2820\"\u003e\n\u003cli data-end=\"2873\" data-start=\"2820\"\u003e\n\u003cp data-end=\"2873\" data-start=\"2822\"\u003e\u003cstrong data-end=\"2839\" data-start=\"2822\"\u003e✅ Reliability\u003c\/strong\u003e – No vanes or actuator to fail.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2934\" data-start=\"2874\"\u003e\n\u003cp data-end=\"2934\" data-start=\"2876\"\u003e\u003cstrong data-end=\"2898\" data-start=\"2876\"\u003e✅ Consistent Boost\u003c\/strong\u003e – Predictable spool and response.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3004\" data-start=\"2935\"\u003e\n\u003cp data-end=\"3004\" data-start=\"2937\"\u003e\u003cstrong data-end=\"2960\" data-start=\"2937\"\u003e✅ Lower Maintenance\u003c\/strong\u003e – Fewer moving parts mean fewer failures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3083\" data-start=\"3005\"\u003e\n\u003cp data-end=\"3083\" data-start=\"3007\"\u003e\u003cstrong data-end=\"3033\" data-start=\"3007\"\u003e✅ More Power Potential\u003c\/strong\u003e – Perfect for towing or high-horsepower builds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3160\" data-start=\"3084\"\u003e\n\u003cp data-end=\"3160\" data-start=\"3086\"\u003e\u003cstrong data-end=\"3107\" data-start=\"3086\"\u003e✅ Long-Term Value\u003c\/strong\u003e – Less downtime, fewer repairs, and peace of mind.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"3165\" data-start=\"3162\"\u003e\n\u003ch2 data-end=\"3190\" data-start=\"3167\"\u003eThe Bottom Line\u003c\/h2\u003e\n\u003cp data-end=\"3373\" data-start=\"3192\"\u003eThe factory VGT is often the Achilles’ heel of the 6.7L Cummins. If you’re dealing with actuator codes, sticking vanes, or turbo noise, it may be time to troubleshoot and upgrade.\u003c\/p\u003e\n\u003cp data-end=\"3555\" data-start=\"3375\"\u003eA \u003cstrong data-end=\"3411\" data-start=\"3377\"\u003enon-VGT S300 or S400 turbo kit\u003c\/strong\u003e offers a long-term solution: more reliable, easier to maintain, and capable of producing the power and response you expect from your Cummins.\u003c\/p\u003e","products":[],"url":"https:\/\/smedingdealers.com\/collections\/cummins-replacment-turbos-2007-2018.oembed","provider":"Smeding Dealers","version":"1.0","type":"link"}