The 2023 F-250 Super Duty represents Ford's latest heavy-duty platform with the proven 6.7L Power Stroke diesel and gas 7.3L Godzilla. While newer models show fewer pattern failures, early diesel emissions system issues and 10R140 transmission cooler leaks are emerging concerns, plus the 7.3L has shown piston/ring failures under heavy towing loads.
10R140 Transmission Oil Cooler Leaks
Occasional · medium severityTypical onset: 30,000-70,000 mi
Symptoms: transmission fluid seeping from cooler lines at radiator, low fluid level warnings, slipping or delayed shifts when hot, pink fluid puddles under front of truck
Fix: Replace external cooler assembly and lines, flush system. 3-4 hours labor. Some cases require internal seal replacement adding 2-3 hours if trans must be dropped for torque converter seal.
Estimated cost: $800-1,800
6.7L Power Stroke DEF System Faults and Doser Failures
Occasional · high severityTypical onset: 40,000-90,000 mi
Symptoms: check engine light with P20EE or P204F codes, derate to 55 mph after warning countdown, DEF quality poor message despite fresh fluid, crystallization around doser injector
Fix: Replace DEF doser injector, flush lines, update software calibration. Often requires new NOx sensors if contaminated. 4-6 hours labor for doser, add 2 hours for sensors.
Estimated cost: $1,200-2,800
7.3L Godzilla Piston Ring and Cylinder Scoring (Heavy Towing)
Rare · high severityTypical onset: 60,000-120,000 mi
Symptoms: excessive oil consumption over 1 qt per 1,000 miles, blue smoke on cold start or under load, loss of compression, metallic ticking that increases with load, fouled spark plugs on specific cylinders
Fix: Complete engine teardown required. In severe cases needs pistons, rings, honing or cylinder boring if scoring present. 25-35 hours labor. Some trucks need full short block replacement under warranty extension.
Estimated cost: $8,500-15,000
Transmission Mount Failures (Diesel models)
Common · low severityTypical onset: 50,000-90,000 mi
Symptoms: clunk when shifting into drive or reverse, vibration at idle in gear, visible sagging or torn rubber on mount, driveline shudder during acceleration
Fix: Replace transmission crossmember mount. Access is tight but straightforward. 1.5-2 hours labor. Often both engine and trans mounts done together for longevity.
Estimated cost: $350-650
6.7L Fuel Filter Housing Leaks and Air Intrusion
Occasional · medium severityTypical onset: 20,000-60,000 mi
Symptoms: hard starting after sitting overnight, loss of prime, extended cranking, visible fuel weeping from filter cap or drain valve, rough idle and white smoke until system re-primes
Fix: Replace filter housing cap, drain valve, and seals. Sometimes entire housing if threaded inserts strip. 1-2 hours labor. Must prime system properly or risk injector damage.
Estimated cost: $250-700
Diesel Particulate Filter (DPF) Clogging on Short-Trip Duty
Occasional · medium severitySymptoms: frequent active regen cycles, check engine light with P2002 or P244B codes, power loss and excessive exhaust smell, fuel economy drops 3-5 mpg, exhaust temp warnings
Fix: Force manual regen first, if unsuccessful requires DPF removal and professional cleaning or replacement. Cleaning: 3-4 hours labor. Replacement: 5-7 hours plus $2,500+ part cost.
Estimated cost: $800-4,000
Buy the diesel if you tow heavy and run highway miles; the 7.3L gas is cheaper to own for lighter duty, but skip both if you're a short-trip commuter — these need to work to stay healthy.
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.