Four valves per cylinder and the electronically controlled Bosch VP44. Introduced partway through the 1998 model year in Ram 2500/3500; ran through 2002.
Years
1998.5–2002
Displacement
5.9 L / 359 ci
Valves
24 (4 per cyl.)
Fuel system
Bosch VP44 electronic rotary
Turbo
Holset HX35W / HY35W (wastegated)
Factory ratings
215 hp / 420 lb‑ft to 245 hp / 505 lb‑ft
01Verified specs
Figures for Dodge/Ram pickup applications. Where sources disagree, we say so in the row.
Electric, mounted on the driver side of the block[1,3,6]
Turbocharger
Holset HX35W (manual trucks and 1998.5–2000 automatics, plus 2001–2002 HO); HY35W (2001–2002 automatics)[1,3]Diesel Hub lists the HY35W from 2000; DrivingLine and Green Handle Media say 2001.
Diesel Hub notes the HO was not offered with the California emissions package.
03Notable changes by year
1998.5
ISB 24-valve replaces the 12-valve: new 4-valve head, VP44 pump, electric lift pump, higher-capacity oil pump.[1,3]
1999–2001
Some blocks from this period carry the "53" casting (see Common issues).[1,6,7]
2000
Valve cover changes from red/silver aluminum to a black/silver magnesium cover.[1]
2001
High Output version (17.2:1 compression, different injectors and pump calibration) added with the NV5600 6-speed. Automatics switch to the HY35W turbo.[1,3]
These are patterns reported by the sources below, not a prediction for any one truck. Many engines never have these problems. Diagnose before you buy parts, and follow factory service information for repairs.
Lift pump failure and VP44 damage
Applies to 1998.5–2002
The VP44 is cooled and lubricated by the diesel flowing through it, and its built-in electronics depend on that fuel too. The factory electric lift pump that feeds it was block-mounted, where vibration and heat take a toll, and it had a reputation for failing.
When supply pressure drops, the VP44 can be damaged or fail. That is why owners of these trucks commonly watch fuel supply pressure with a gauge. DrivingLine cites at least 5 psi as the floor, with 10–15 psi recommended.
What to watch for
Hard starts, stumbling, loss of power or a no-start can point at low fuel supply, but also at other faults: test before replacing an expensive pump.
A fuel pressure gauge is the usual way to know what the lift pump is actually doing.
A batch of blocks cast in Brazil by the supplier TUPY had thinner water-jacket walls than earlier and later castings. DrivingLine puts it at roughly 100,000 blocks. They are identified by a "53" cast into the side of the block. Sources disagree on which side it usually appears (DrivingLine says driver side front, Diesel Hub often finds it on the passenger side), so check both.
Cracks, when they happen, typically start below the freeze plugs and leak coolant. Many 53 blocks never crack. Hard use and added power are believed to raise the odds.
What to watch for
Look for the cast-in "53" (not a stamped serial number).
Unexplained external coolant loss near the freeze plugs is the classic sign.
The same timing-housing dowel pin found on the 12-valve is present here. DrivingLine recommends securing it on all 1989–2002 engines; Diesel Hub reports that failures are mostly seen on 12-valves. See the 12-valve page for the full explanation.
Recalls: enter your 17-character VIN at nhtsa.gov/recalls. It shows any unrepaired safety recall on that exact truck.
Service bulletins (TSBs): on the same NHTSA page, search by year, make and model instead of VIN. The results include recalls, investigations, complaints and manufacturer communications, which is where TSB summaries are listed. Shortcuts: 2001 Dodge Ram 25002002 Dodge Ram 3500
We don't reproduce bulletin text. It's the manufacturer's copyrighted material, and summaries on NHTSA are the authoritative public record. More on this on the Recalls & TSBs page.
Engine-related recalls we verified
We searched NHTSA's recall data for 1998–2002 Dodge Ram 2500/3500 and did not find a campaign specific to the Cummins engine or VP44. Other recalls exist for these model years, so run your VIN.
06Parts links
SRCSources
Accessed October 2026. Numbers in brackets throughout the page point here. Brand names are used descriptively.