2019 RAM 2500

6.7L I6 Cummins Diesel4WDAUTOMATICdieselturbo
5-Year Cost of Ownership
$19,479 maintenance + known platform issues
~$3,896/yr · 320¢/mile equivalent · $6,427 maintenance + $10,132 expected platform issues
Compare this engine
vs
6.4L V8 Hemi Gas
Common Problems & Known Issues

The 2019 Ram 2500 is split personality—the 6.7 Cummins is a workhorse with minor nuisances, while the 6.4 Hemi has proven catastrophically failure-prone with widespread engine destruction issues that overshadow an otherwise solid heavy-duty platform.

6.4L Hemi Catastrophic Engine Failure (Lifter/Cam/Bearing Failure)

Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: sudden loss of oil pressure, violent knocking/ticking from valve train, metal shavings in oil, check engine light with misfire codes, complete engine seizure in worst cases
Fix: Hemi MDS (cylinder deactivation) lifter failure cascades into cam lobe wear, debris circulation destroys bearings and cylinder walls. Requires complete engine rebuild or replacement—short block minimum, often long block. 25-35 hours labor for R&R plus machine work if rebuilding. This is not a wear item, it's a design defect affecting a significant percentage of 2019-2021 Hemis.
Estimated cost: $8,000-15,000

68RFE Transmission Oil Cooler Failure

Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: transmission fluid mixing with coolant (strawberry milkshake in overflow), overheating transmission, harsh shifting, coolant loss with no external leaks
Fix: Internal cooler in radiator fails, cross-contaminates fluids. Requires radiator replacement, complete trans flush (multiple cycles), often filter and fluid services. If caught late, transmission rebuild needed due to coolant damage. 6-8 hours labor if trans survives, 20+ if internal damage occurred.
Estimated cost: $1,200-2,500 (cooler only), $4,500-7,000 (if trans damaged)

Front Axle Disconnect Motor Failure

Occasional · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: 4WD service light illuminated, grinding/clunking when engaging 4WD, 4WD will not engage, vehicle stuck in 4WD (rare but happens)
Fix: Actuator motor on front differential corrodes or internal gears strip. Exposed location means road salt and moisture kill these. Replace actuator assembly, 2-3 hours labor. Common enough that upgraded aftermarket units exist.
Estimated cost: $400-800

Cummins DEF System Faults (Diesel Only)

Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: DEF quality warning messages, derate warning (speed limitation countdown), poor fuel economy, check engine light with NOx sensor codes
Fix: DEF injector, NOx sensors, or DEF tank heater fail. Sensors run $300-600 each (two of them), injector is $800-1,200 parts. Diagnosis crucial—don't throw parts at it. 2-4 hours labor depending on component. Recalls covered fuel system pumps but individual sensors/injectors are owner responsibility.
Estimated cost: $600-2,000

Backup Camera Failure

Occasional · low severity
Symptoms: intermittent black screen when shifting to reverse, gridlines visible but no image, complete camera failure, water intrusion visible in lens
Fix: Tailgate-mounted camera seal fails, moisture intrusion kills electronics. Recall 23V-383 covered some units but many fall outside parameters. Camera replacement 1 hour labor, reprogram another 0.5 hours. Aftermarket cameras work fine and cost less.
Estimated cost: $300-600

Transmission Mount Failure

Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: clunk when shifting from park to drive/reverse, vibration at idle in gear, driveline shudder under load, visible sag or torn rubber on crossmember mount
Fix: Rubber isolator in transmission crossmember mount deteriorates from heat and torque cycling (especially on diesel). Cheap part ($80-150) but requires transmission support for safe replacement. 1.5-2 hours labor. Replace both trans and transfer case mounts at same time.
Estimated cost: $250-450

Exhaust Manifold Bolt Failure (Hemi Only)

Occasional · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: exhaust tick at cold start that may or may not disappear when warm, visible soot streaks on manifold, failed emissions test, smell of exhaust in cabin with HVAC on
Fix: Manifold bolts stretch and break due to thermal cycling. Requires manifold removal, broken bolt extraction (often requires drilling), replacement studs. Driver side 6-8 hours (steering shaft removal), passenger side 4-5 hours. Sometimes combined with lifter repairs if engine is already apart.
Estimated cost: $800-1,500 per side
Owner tips
  • If buying a 6.4 Hemi—get extended warranty or budget for engine replacement, period. This is not optional. Check oil religiously and avoid extended idle.
  • Cummins diesel: change fuel filters religiously at 15k intervals (even though book says longer), use quality DEF fluid only, and keep DEF tank above 1/4 to avoid heater/pickup issues in winter.
  • Transmission: add auxiliary cooler if towing regularly, service fluid at 60k regardless of 'lifetime fill' claims, watch for cooler contamination signs religiously.
  • 4x4 actuators: spray with fluid film or similar corrosion inhibitor annually if in rust belt, consider upgraded sealed aftermarket unit preemptively if off-roading.
  • Document every service with photos—Ram has been difficult with goodwill claims on Hemi failures, paper trail helps if you get a sympathetic service manager.
Cummins diesel with careful DEF maintenance? Solid buy. 6.4 Hemi? Avoid unless you enjoy engine replacement roulette—it's not if, but when.
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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