The 2012 Ram 3500 with 6.7L Cummins is a workhorse diesel known for engine durability, but the 68RFE automatic transmission is its Achilles heel, with frequent solenoid failures, torque converter issues, and cooling system problems that plague many high-mileage units.
68RFE Transmission Solenoid Pack Failure
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Harsh or delayed shifts, especially 2-3 and 5-6, Check engine light with P0871 or P0748 codes, Limp mode or stuck in one gear, Erratic shifting under load or when towing
Fix: Replace entire solenoid pack assembly in transmission pan; requires dropping pan, new filter, fluid flush. 3-5 labor hours depending on access and experience. Often the overdrive solenoid or TCC solenoid fails first, but replacing the whole pack prevents comebacks.
Estimated cost: $800-1,500
Torque Converter Shudder and Lockup Clutch Failure
Common · high severity
Typical onset: 100,000-180,000 mi
Symptoms: Vibration or shudder at 40-50 mph during light acceleration, Slipping sensation when converter should lock, Metal shavings in transmission pan during fluid service, Overheating transmission, especially when towing
Fix: Torque converter replacement requires full transmission removal. 8-12 labor hours. Often done alongside a transmission rebuild if internal damage has occurred from debris. Many techs recommend installing an aftermarket heavy-duty converter for towing applications.
Estimated cost: $2,500-4,500
Transmission Oil Cooler and Line Leaks
Common · medium severity
Typical onset: 60,000-120,000 mi
Symptoms: Transmission fluid dripping near radiator area, Pink or red fluid visible under front of truck, Low transmission fluid level on dipstick, Transmission overheating warnings
Fix: External cooler lines rust through at fittings or crimp points; factory cooler inside radiator can crack internally. Replace lines (2-3 hours) or add/replace auxiliary cooler (3-4 hours). Flush system and refill with fresh ATF+4.
Estimated cost: $400-1,200
Transmission Mount Failure
Occasional · medium severity
Typical onset: 70,000-130,000 mi
Symptoms: Clunking when shifting from park to drive or reverse, Excessive vibration at idle in gear, Visible sagging or torn rubber on crossmember mount, Driveline vibration under acceleration
Fix: Replace transmission crossmember mount; requires supporting transmission with jack, removing crossmember bolts. 1.5-2.5 hours. The Cummins torque and heavy-duty transmission stress this mount, especially in trucks used for towing.
Estimated cost: $250-500
Fuel Filter Housing and Water-in-Fuel Sensor Corrosion
Occasional · medium severity
Typical onset: 50,000-100,000 mi
Symptoms: Hard starting or extended cranking when cold, Check engine light with P0087 (fuel rail pressure low), Fuel leak visible at filter housing on driver side frame, Water-in-fuel light stays on or flickers intermittently
Fix: Replace fuel filter housing assembly and water separator sensor; often corrodes where dissimilar metals meet. 1.5-2 hours. Also replace fuel filters during this job. Some techs apply dielectric grease to prevent future corrosion.
Estimated cost: $400-700
Shift Cable Bushing Wear and Adjustment Issues
Occasional · low severity
Typical onset: 80,000-150,000 mi
Symptoms: Gear indicator doesn't match actual gear selected, Difficulty shifting out of park, Loose or sloppy feel in shifter, Won't start because neutral safety switch isn't engaged properly
Fix: Replace shift cable or cable bushings at transmission linkage; adjust cable position. 1-2 hours. Plastic bushings wear out from heat and movement. Aftermarket metal bushings available as upgrade.
Estimated cost: $150-400
Owner tips
Change transmission fluid and filter every 30,000-40,000 miles if towing regularly; 68RFE is sensitive to dirty fluid and heat
Install auxiliary transmission cooler if you tow over 10,000 lbs frequently — factory cooling is marginal
Replace fuel filters every 15,000 miles and drain water separator monthly in humid climates
Check transmission mount annually; the Cummins torque destroys worn mounts quickly
Use only ATF+4 spec fluid in the 68RFE — other fluids cause solenoid problems
Buy it for the bulletproof Cummins engine, but budget $3,000-5,000 for eventual transmission work — the 68RFE is the weak link in an otherwise durable platform.
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.
Fitment notes: Heavy-duty diesel application requires high CCA; dual battery configuration available on some models
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Every control module on the 2011-2012 Dodge Ram 3500 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Remote Function Actuator (RFA)0.8 hr R&Rdealer / factory tool +0.5 hrwith remote start or keyless entry▸ programming details
📍 Behind left rear interior trim panel
🔧 wiTECH
⚠️ Handles remote start and keyless entry functions
Park Assist Module (PAM)0.8 hr R&Raftermarket tool +0.2 hrwith rear park assist▸ programming details
📍 Behind rear bumper, center mounted
🔧 Autel/Launch
⚠️ Sensor calibration may be required
Rear View Camera Module (RVCM)0.5 hr R&Rrelearn only +0.1 hrwith backup camera▸ programming details
📍 Integrated in tailgate handle assembly
🔧 Self-learn
⚠️ Camera calibration lines configured through radio
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2012 Dodge Ram 3500 6.7L I6 Cummins Diesel and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.