Common Failures Found in the 6.7L Cummins Engine The 6.7L Cummins engine is widely known for its power, reliability, and longevity. Found in many Ram heavy-duty trucks since 2007, this diesel workhorse has proven itself in countless demanding environments. However, like all engines, it's not without its issues. Whether you're a fleet manager, diesel mechanic, or DIY truck enthusiast, understanding the most common problems with the 6.7L...