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Diesel Engine Repair

6.7 Cummins Common Problems And How to Fix It

Even the best system has its flaws, and this is true with the 6.7 Cummins. Despite having a great reputation in the industry since 1989, the Dodge Ram may still experience glitches and other issues, like other modern diesel trucks do. So what is the most common issue of Cummins 6.7l and what are the ways to fix it?

The 6.7L Cummins engine is the newest addition to the B series. This straight-six, 24-valve diesel engine was released for Ram pickups in 2007, a great truck brand. Today, this turbodiesel is still used in Dodge Ram trucks, particularly the 2500 and 3500+ models.

6.7 Cummins


How Reliable Are The 6.7 Cummins?

When it comes to reliability, the Cummins 6.7l can provide up to 1000 tq and 400hp. Many modern diesel truck owners say that it’s one of the most impressive light truck turbodiesel engines to date.

However, it does not match the reputation of 5.9 Cummins, 7.3 Power Stroke, and other older Cummins diesel engines in the series that require fuel dilution and use fuel injectors and a diesel particulate filter.

Most emissions-related technology or exhaust gases can kill modern diesel engine including the 6.7 Cummins. EGR valve and DPF systems are some of the components that can lead to EGR system problems in the engine.

For most mods and aftermarket improvements, you can rely on Titan Diesel Sports, especially when you choose to remove EGR or DPF systems and other emissions system to exhaust gas recirculation and prevent turbo lag that cause issues on the engine.

Keep in mind the SCR emissions control systems require the basics of emissions regulations including occasional oil analysis for pickup trucks in the area to avoid legal problems in emissions equipment.


A new turbocharger is in the hands of an auto mechanic. Inspection of the spare part for compliance and integrity.


Below are the most common 6.7L Cummins problems and how to fix them:

  • The key won’t turn the ignition on. Check engine light if the ignition lock is on and if the front wheels are turned away or pressed into a curb stone. Turn your steering wheel right and left as you jiggle the ignition key gently to loosen the lock.
  • Safety light shines nonstop. If the key-shaped light keeps shining on the dashboard due to engine fault codes, it could be the ignition coil reading the wrong key. The correct code must be used so that the security sensor will read it correctly and the security light will stop blinking.
  • Variable geometry turbochargers crank slowly until it starts. This means the engine doesn’t have enough power to make the variable geometry turbo and head gaskets work, especially with clogged diesel particulate filters. Ensure the battery and cables or terminals are in good condition. Old batteries should be replaced while exhaust manifold leaks must be repaired.
  • Turbocharger failure with worn bearings and power loss. If you know why your vehicle won’t run or confirm fuel dilution, it could be difficult to diagnose. Some common causes include battery and exhaust stream problems, tight battery wires, insufficient fuel or diesel exhaust fluid, air filter and security issues, faulty injection pump, turbine wheel damage, and anti-theft feature malfunction.
  • Dead battery. If the starter turns slowly while starting the engine, or there’s a grinding noise and high operating temperatures, the voltage may have been depleted and head gasket failures. You need to refill the engine oil or replace the battery while checking the cylinder walls, exhaust brake, compressor wheel, and fuel lines.

What Is The Life Expectancy Of A 6.7 Cummins?

Maintaining your Dodge Ram Cummins oil seals fuel system will pay off in time, especially when it comes to life expectancy and significant power. With the right diesel mechanic on your side, a well-maintained 6.7L Cummins diesel engine can sustain up to 250,000 miles and beyond.

Overall, it’s pretty decent longevity that you can count on with more power, higher mileage, and sheer torque just like modern diesels and earlier models of Ram truck.