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2023 RAM 2500

6.7L I6 Cummins Diesel•4WD•AUTOMATIC•diesel•turbo
5-Year Cost of Ownership
$17,506 maintenance + known platform issues
~$3,501/yr · 290¢/mile equivalent · $6,427 maintenance + $8,159 expected platform issues
Compare this engine
vs
6.4L V8 Hemi Gas
Common Problems & Known Issues

The 2023 Ram 2500 is a capable heavy-duty truck with two distinct powertrains that each bring their own headaches. The 6.4L Hemi has known lifter failures and exhaust manifold bolt issues, while the 6.7L Cummins suffers from DEF system nightmares and emissions component failures that can strand you.

6.4L Hemi Lifter Failure and Camshaft Wear

Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Ticking or tapping noise at startup that may persist, Check engine light with misfire codes, Loss of power under load, Metal shavings in oil during changes
Fix: Requires complete lifter replacement, often camshaft replacement, and occasionally cylinder head work if rocker arms are damaged. 12-18 hours labor depending on how deep the damage goes. This is the Hemi's Achilles heel and Chrysler has issued TSBs but no permanent fix.
Estimated cost: $4,000-7,500

6.7L Cummins DEF System Failures (Heater, Pump, Quality Sensor)

Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: DEF system fault warning with countdown to derate, Reduced engine power mode, DEF gauge reading incorrect or empty when full, Check engine light with P20EE, P204F codes
Fix: DEF tank heater element failure is most common, followed by the pump assembly. Quality sensor also fails regularly. Tank must be dropped for heater replacement. 4-6 hours labor for heater, 2-3 hours for pump or sensor. Use OEM parts only—aftermarket DEF components fail quickly.
Estimated cost: $1,200-2,800

6.4L Hemi Exhaust Manifold Bolt Failure

Occasional · medium severity
Typical onset: 50,000-100,000 mi
Symptoms: Exhaust tick or tapping that gets louder with RPM, Visible exhaust leak at manifold, Smell of exhaust in cabin, Check engine light with O2 sensor codes
Fix: Manifold bolts corrode and break, allowing manifolds to crack. Requires manifold replacement and careful extraction of broken bolts from cylinder heads. Drivers side is 6-8 hours, passenger side 5-7 hours. Some shops charge more if bolts break flush and require drilling/tapping.
Estimated cost: $1,500-3,200

68RFE Transmission Oil Cooler Line Leaks

Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Transmission fluid puddles under truck, Low transmission fluid warning, Burnt transmission smell, Harsh or delayed shifts
Fix: Cooler lines rust through at brackets or connection points. External cooler itself can also leak. Requires line replacement and sometimes auxiliary cooler replacement. 3-5 hours depending on extent. Flush and refill mandatory. Check cooler fins for road debris damage while you're there.
Estimated cost: $800-1,800

EGR Cooler Failure (6.7L Cummins)

Occasional · high severity
Typical onset: 80,000-150,000 mi
Symptoms: White smoke from exhaust, Coolant loss with no visible leak, Rough idle, Check engine light with EGR flow codes, Coolant smell in exhaust
Fix: EGR cooler develops internal cracks, allowing coolant into exhaust or exhaust into cooling system. Cooler replacement is 8-10 hours and often includes EGR valve cleaning/replacement and coolant system flush. Delete kits exist but are illegal for road use and will cause inspection failures.
Estimated cost: $2,500-4,000

Airbag Clockspring Failure (Steering Column)

Occasional · medium severity
Symptoms: Airbag warning light illuminated, Horn not working or working intermittently, Cruise control buttons non-functional, No fault codes stored in some cases
Fix: Clockspring in steering column fails, breaking electrical connection to airbag and steering wheel controls. Covered by NHTSA recall but some trucks fall outside VIN range. 2-3 hours labor for replacement. Steering wheel must come off and system must be calibrated afterward.
Estimated cost: $600-1,200

Rear Differential Pinion Seal Leak

Common · low severity
Typical onset: 40,000-90,000 mi
Symptoms: Gear oil drips from front of rear differential, Puddles under rear axle, Low differential fluid on dipstick if equipped, Whining noise from rear end if fluid gets low
Fix: Pinion seal weeps or fails completely, especially on trucks that tow heavy. Driveshaft must come out, pinion nut torque is critical on reassembly. 2-3 hours labor plus fluid. Check pinion bearing preload during job—if it's loose, you're looking at a full rebuild.
Estimated cost: $400-800
Owner tips
  • If buying a 6.4L Hemi, get a pre-purchase borescope inspection of cylinders and listen carefully for lifter tick—walk away if present
  • Cummins buyers: confirm all DEF system recalls completed and ask for records of DEF component replacements
  • Change transmission fluid every 60k miles if towing regularly, not the 100k+ Chrysler recommends
  • Use quality diesel fuel and change fuel filters every 15k miles on Cummins—cheap fuel kills injectors at $500+ each
  • Check exhaust manifolds during every oil change on 6.4L—catching leaks early prevents bigger manifold cracks
Buy the Cummins if you need towing capacity and can handle DEF headaches; avoid the 6.4L Hemi unless you're gambling on lifters or find one with documented recent lifter replacement under warranty.
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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