2015 RAM 2500

6.7L I6 Cummins Diesel4WDAUTOMATICdieselturbo
5-Year Cost of Ownership
$42,563 maintenance + known platform issues
~$8,513/yr · 710¢/mile equivalent · $30,685 maintenance + $8,958 expected platform issues
Compare this engine
vs
6.4L V8 Hemi Gas
Common Problems & Known Issues

The 2015 Ram 2500 is a solid heavy-duty platform, but the 6.7L Cummins suffered from catastrophic engine failures tied to defective connecting rod bearings and crankshaft issues, while the 6.4L Hemi is reliable but paired with a transmission that often needs its cooler replaced.

Cummins 6.7L Catastrophic Engine Failure (Spun Bearings)

Occasional · high severity
Typical onset: 60,000-120,000 mi
Symptoms: sudden loss of oil pressure, violent knocking from bottom end, metal shavings in oil, check engine light with low oil pressure codes, engine seizure in extreme cases
Fix: Complete engine rebuild or replacement required. Crankshaft, connecting rod bearings, and often pistons need replacement. 40-60 labor hours for full rebuild; many opt for reman long-block swap at 25-35 hours. This is a known defect in 2013-2016 Cummins engines traced to bearing material and oil passage design.
Estimated cost: $12,000-25,000

Transmission Oil Cooler Failure

Common · high severity
Typical onset: 70,000-130,000 mi
Symptoms: transmission fluid in coolant (strawberry milkshake appearance), coolant in transmission, transmission slipping or delayed engagement, overheating transmission, radiator tank cracking at cooler connection
Fix: Replace transmission oil cooler (integrated into radiator) plus full transmission fluid flush and often radiator replacement. If contamination went both ways, transmission rebuild may be necessary. 4-6 hours labor for cooler/radiator, add 18-25 hours if transmission needs rebuild.
Estimated cost: $800-1,200 (cooler only), $3,500-5,500 (if transmission damaged)

Transmission Mount Failure

Common · medium severity
Typical onset: 80,000-150,000 mi
Symptoms: clunking when shifting into drive or reverse, vibration at idle in gear, visible sag or separation of rubber mount, harsh engagement, drivetrain shudder under load
Fix: Replace rear transmission mount and crossmember bushings. Heavy-duty trucks destroy these faster due to weight and towing. 2-3 hours labor, straightforward job but requires supporting transmission.
Estimated cost: $300-550

Fuel Filter Housing Leaks (Cummins)

Common · medium severity
Typical onset: 50,000-100,000 mi
Symptoms: fuel smell in cab or engine bay, visible fuel weeping from filter housing, hard starting when cold, air in fuel system, rough idle or loss of power
Fix: Replace fuel filter housing assembly and seals. The plastic housing cracks or o-rings fail. Some techs upgrade to aftermarket aluminum housing. 1.5-2.5 hours labor including priming system.
Estimated cost: $400-700

Death Wobble (Front Suspension)

Occasional · high severity
Typical onset: 60,000-120,000 mi
Symptoms: violent steering wheel oscillation at highway speeds, triggered by bumps or lane changes, loose or wandering steering feel, clunking from front end over bumps
Fix: Typically caused by worn track bar bushings, ball joints, tie rod ends, or steering stabilizer. Requires systematic inspection of all front end components. Track bar and ball joints are usual culprits. 4-6 hours labor for full front end overhaul with alignment.
Estimated cost: $1,200-2,500

Exhaust Brake Solenoid Failure (Cummins)

Occasional · low severity
Typical onset: 90,000-150,000 mi
Symptoms: exhaust brake not engaging, check engine light with exhaust brake solenoid codes, lack of engine braking when towing, no change in sound when activating exhaust brake
Fix: Replace exhaust brake solenoid valve on turbo or exhaust system. 1-2 hours labor, accessible but requires working around hot exhaust components.
Estimated cost: $350-600

TIPM (Totally Integrated Power Module) Failures

Occasional · medium severity
Symptoms: intermittent no-start, fuel pump not priming, gauges going haywire, random warning lights, wipers or accessories operating on their own, parasitic battery drain
Fix: TIPM is the central fuse/relay box and known weak point in Rams. Sometimes individual relays can be resoldered, but full replacement is typical fix. 2-3 hours labor for R&R and programming.
Estimated cost: $800-1,400
Owner tips
  • If buying a used Cummins, pull oil analysis and inspect for bearing material—avoid 2013-2016 model years or budget for engine replacement
  • Check transmission cooler for cross-contamination every oil change; catching it early saves the transmission
  • Replace fuel filter housing proactively at 60k mi on Cummins to avoid getting stranded
  • Inspect front suspension components annually if you tow heavy—death wobble is dangerous and expensive once multiple parts fail
  • Use OEM transmission fluid only (ATF+4); aftermarket fluids contribute to premature failure in these 68RFE transmissions
Buy the 6.4L Hemi version without hesitation; avoid the 2015 Cummins unless you can verify the engine internals were already replaced or you're prepared for a $15k surprise.
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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