Diesel Engine Losing Power Under Load: 10 Causes From Simple Fixes to Major Repairs Ranked by Likelihood Your diesel truck used to pull trailers up hills without breaking a sweat. Now it’s huffing and puffing like it ran a marathon just merging onto the highway. Sound familiar? Power loss under load is probably the most frustrating diesel problem out there. And honestly, it can mean anything from a $20 fix to a $5,000 repair. Diesel Highway INC : https://www.google.com/maps?cid=13598199990998753202 Learn more : https://viewpen.online/diesel-engine-power-loss-causes/