2019 RAM 3500

6.7L I6 Cummins DieselRWDAUTOMATICdieselturbo
5-Year Cost of Ownership
$44,975 maintenance + known platform issues
~$8,995/yr · 750¢/mile equivalent · $30,685 maintenance + $11,370 expected platform issues
Common Problems & Known Issues

The 2019 Ram 3500 with the 6.7L Cummins is a workhorse truck, but this generation suffers from catastrophic engine failures tied to oil pump and connecting rod issues, plus transmission cooler problems that can grenade the 68RFE/Aisin if ignored.

Cummins Oil Pump Failure Leading to Catastrophic Engine Damage

Occasional · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Sudden loss of oil pressure, Rattling or knocking from lower engine, Metal shavings in oil, Check engine light with low oil pressure codes, Engine seizure in worst cases
Fix: Oil pump drive gear shears or pump housing cracks, starving bearings. Requires complete disassembly to inspect rod/main bearing damage. If caught early, oil pump replacement is 8-10 hours. If bearings are scored, you're looking at short block or full rebuild with new pistons, rods, crank work—80-120 hours labor depending on damage extent. Many engines are toast by the time symptoms appear.
Estimated cost: $1,200-2,500 for pump alone, $15,000-25,000 for short block/rebuild

Connecting Rod and Main Bearing Failures

Occasional · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Deep knocking noise on cold start that may disappear when warm, Metallic ticking under load, Sudden catastrophic knock and loss of power, Oil pressure fluctuations, Metal debris in oil filter
Fix: Rod bearings wear prematurely, often from oiling issues or defective bearings in this production run. Once knocking starts, damage progresses fast. Engine-out required, inspect all bearings, replace rods/pistons if journals are scored, crank may need machining. Full rebuild typically 90-110 hours, short block swap 60-80 hours if cores are available. This is the big one that kills these trucks.
Estimated cost: $18,000-30,000

Transmission Oil Cooler Failure and Contamination

Common · high severity
Typical onset: 50,000-90,000 mi
Symptoms: Pink or milky transmission fluid, Transmission slipping or delayed shifts, Coolant loss with no visible leaks, Overheating transmission, White smoke from exhaust if coolant enters trans severely
Fix: Internal transmission cooler in radiator fails, mixing coolant and ATF. Contamination destroys clutch packs and valve body. Requires radiator replacement (3-4 hours), full transmission flush, and often transmission rebuild or replacement if contamination went unnoticed. 68RFE transmission out and rebuild is 18-24 hours; Aisin is more robust but still vulnerable to cooler failure.
Estimated cost: $800-1,200 for radiator/flush if caught immediately, $4,500-7,500 for transmission rebuild

Transmission Mount Failure

Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting into drive or reverse, Vibration through cab under acceleration, Driveline shudder, Visible sag or tearing of rubber mount
Fix: Rear transmission mount tears from the weight of the transmission and driveline torque. Replacement requires supporting transmission, removing crossmember—2.5-3.5 hours. Aftermarket poly mounts hold up better than OEM rubber.
Estimated cost: $350-600

DEF System and Fuel Filter Housing Issues

Common · medium severity
Symptoms: DEF heater fault codes, 5 mph limp mode on cold starts, Fuel in coolant or coolant in fuel, Hard starting, White smoke on startup
Fix: DEF heater elements fail, triggering limp mode until system warms. Fuel filter housing can crack internally, mixing fuel and coolant. DEF heater replacement is 2-3 hours. Fuel filter housing replacement requires draining, careful disassembly to avoid air in system—3-4 hours. Both are Cummins quirks you'll see repeatedly.
Estimated cost: $600-900 for DEF heater, $800-1,200 for fuel filter housing

ABS Module Corrosion and Brake Caliper Seizing

Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: ABS/traction control lights, Brake pedal pulsation, Pulling to one side during braking, Premature pad wear on one side, Overheating front brakes
Fix: ABS module prone to internal corrosion in rust-belt trucks, causing false activation. Module replacement and programming 2-3 hours. Front calipers seize from road salt—single caliper replacement 1.5 hours per side, but often both fronts need doing at once. Aftermarked loaded calipers recommended.
Estimated cost: $800-1,200 for ABS module, $400-700 per caliper pair

EGR Cooler Clogging and Turbo Actuator Failure

Occasional · medium severity
Typical onset: 80,000-140,000 mi
Symptoms: Loss of power under load, Black smoke from exhaust, P0401 or P2002 codes, High EGT readings, Turbo whistle or sluggish boost
Fix: EGR cooler clogs with soot, restricting flow. Delete isn't legal, so cleaning or replacement is 6-8 hours. Turbo VGT actuator sticks or fails, causing underboost or overboost. Actuator replacement 4-5 hours; full turbo rebuild 8-10 hours if seized internals. Running quality fuel and performing EGR cleaning every 60k helps.
Estimated cost: $1,200-1,800 for EGR cooler, $800-1,200 for actuator, $2,500-3,500 for turbo rebuild
Owner tips
  • Change oil every 5,000 miles with quality diesel-rated oil—oil pump and bearing failures are often tied to extended intervals or cheap oil
  • Check transmission fluid color every oil change; catch cooler failure before it contaminates the trans
  • Replace fuel filters every 15,000 miles and use quality diesel fuel with lubricity additives
  • Inspect transmission mount annually if towing heavy—cheap insurance against driveline damage
  • Monitor oil pressure gauge religiously; any drop below normal is a red flag requiring immediate shutdown
Buy only if you can verify oil change history and confirm no rod knock; budget $5k for inevitable cooler/mount issues and pray the engine wasn't in the bad batch—when these are good, they're unstoppable, but the engine failures are financially ruinous.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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