The P0272 code on your 2019 Ram 3500 indicates that cylinder 4 is not contributing its expected share of power. For this heavy-duty truck, identifying and resolving the problem ensures the power needed for demanding work.
Ram 3500 Engine Options
The 2019 Ram 3500 offers the 6.4L HEMI V8 gas engine or the 6.7L Cummins inline-6 turbo diesel. The V8 has cylinder 4 on the passenger side bank; the inline-6 has cylinder 4 in the middle of the engine. Knowing your engine determines the diagnostic approach.
Contribution Balance Interpretation
The PCM monitors crankshaft acceleration during power strokes. Below-threshold contribution from cylinder 4 indicates that cylinder is producing less power than others. This could stem from fuel delivery problems, compression issues, or—in the HEMI—ignition component failures.
Diagnostic Approach
For the HEMI, check cylinder 4 ignition coil, spark plug, and injector. For the Cummins diesel, focus on injector function—Cummins injectors are known failure items. Test compression for both engines. The Cummins also benefits from checking the high-pressure fuel system for proper delivery to cylinder 4.
Heavy-Duty Repair Considerations
Cummins injectors are expensive but the engine is reliable when properly maintained. HEMI issues are typically more affordable to resolve. Given the 3500's work-truck duties, timely repair prevents strain on remaining cylinders. Heavy loads amplify contribution imbalance symptoms.