If you own or are shopping for a Cummins-powered Dodge or Ram pickup, knowing your engine’s generation is crucial for maintenance, upgrades, and parts compatibility. The 8th digit of your VIN reveals which Cummins engine and fuel system your truck uses. Here’s a comprehensive guide covering every generation, including the transition from Dodge Ram to Ram in 2011, model years, VIN codes, fuel injection pump types, and key vehicle applications.
Models: Dodge Ram 250/350
VIN Code: C
Fuel System: Bosch VE rotary mechanical injection pump
Simple, reliable, mechanical system with moderate power potential.
Horsepower/Torque: 160–175 hp / 400–440 lb-ft (varies by year)
Notes: The original “12-valve” Cummins–famed for reliability and mechanical simplicity.
Common Issues & Upgrades:
Models: Dodge Ram 2500/3500
VIN Code: C or D
Fuel System: Bosch P7100 inline mechanical injection pump (“P-pump”)
Highly desirable for power builds, mechanical tuning, and durability.
Horsepower/Torque: 175–215 hp / 420–440 lb-ft (varies by year and model)
Notes: Still 12-valve through 1998; legendary for mechanical strength and mod potential.
Common Issues & Upgrades:
Models: Dodge Ram 2500/3500
VIN Code: 6
Fuel System: Bosch VP44 electronic rotary injection pump
24-valve head, electronic timing, more emissions controls.
Horsepower/Torque: 215–245 hp / 420–505 lb-ft
Notes: Known for improved drivability and performance, but VP44 electronics can be failure-prone.
Common Issues & Upgrades:
Models: Dodge Ram 2500/3500
VIN Code: C
Fuel System: Bosch CP3 high-pressure common-rail injection
Major leap in power, refinement, and emissions compliance.
Horsepower/Torque: 305–325 hp / 555–610 lb-ft
Notes: Last of the 5.9L Cummins; highly sought after for tuning and reliability.
Common Issues & Upgrades:
Models: Dodge Ram 2500/3500
VIN Code: A
Fuel System: Bosch CP3 high-pressure common-rail injection
Introduction of the 6.7L, DPF emissions, and variable-geometry turbo.
Horsepower/Torque: 350 hp / 650 lb-ft (varies by year)
Notes: First 6.7L in pickups; more emissions equipment, more torque.
Common Issues & Upgrades:
Models: Ram 2500/3500/4500/5500 (Note: “Dodge” dropped, now “Ram”)
VIN Code: L
Fuel System: Bosch CP3 high-pressure common-rail injection
Improved emissions, higher output, and new body/interior.
Horsepower/Torque: 350–385 hp / 800–930 lb-ft (varies by model/year)
Notes: “Ram” becomes its own brand in 2011; 4th Gen trucks are among the most popular ever.
Common Issues & Upgrades:
Models: Ram 2500/3500/4500/5500
VIN Code: L
Fuel System: Bosch CP4 (Early years 2019-2020) , CP3 (Late years 2021+)
Output increased, new emissions systems, and further interior/exterior updates.
Ram Recall on 222,410 2019 & 2020 Ram Pickups for CP4 pumps Inspection / Replacement to CP3 Pump
Horsepower/Torque: Up to 420 hp / 1,075 lb-ft (High Output models)
Notes: Continues with “Ram” branding; latest technology and highest output to date.
Common Issues & Upgrades:
Pre-2010: Trucks branded as “Dodge Ram.”
2011 and newer: Trucks branded as “Ram” (standalone brand).
Parts Compatibility: Injection pumps, injectors, turbos, and electronics differ by generation.
Performance Upgrades: Tuning, fueling, and emissions solutions are engine-specific.
Maintenance: Each generation has unique service intervals and known issues.
How to Find Your VIN:
Check the driver’s side dashboard (visible through the windshield) or your registration/title. The 8th character is your Cummins engine code.
Need help with Cummins upgrades, repairs, or tuning?
At NorCal Diesel Performance, we know every Cummins generation inside and out. Bring us your VIN and let’s make your Dodge or Ram Cummins the best it can be!
A. Yes. In most Dodge and Ram Cummins trucks, the 8th digit of the VIN identifies the engine generation and fuel system. Once you know the VIN code, you can determine whether the truck has a VE pump, P7100, VP44, CP3, or CP4 fuel system.
A. The VIN is typically located on the driver's side dashboard near the windshield and can also be found on your vehicle registration, title, insurance documents, and the driver's door jamb sticker.
A. Each Cummins generation uses different fuel systems, injectors, turbochargers, emissions equipment, and electronic controls. Knowing your exact engine helps ensure you purchase the correct replacement parts, maintenance items, and performance upgrades.
A. The CP3 is widely known for its durability and reliability, while the CP4 was introduced on some 2019-2020 Ram trucks and has been associated with higher failure rates. Many owners prefer the CP3, and some trucks have been updated through recall-related repairs.
A. Yes. Production changes, transitional model years, and different vehicle configurations can result in trucks from the same model year using different engine calibrations or fuel systems. Checking the VIN is the most accurate way to verify which Cummins engine is installed in your truck.
