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What is the transmission problem on a 2012 Ram 3500?

The 2012 Ram 3500's most reported transmission problems involve the six‑speed automatic (68RFE) paired with the 6.7‑liter Cummins diesel, with symptoms such as harsh or delayed shifts, slipping, torque‑converter shudder, and overheating under load.

These issues commonly appear as miles accumulate and are often noticed during heavy towing or when the truck is working hard. Root causes cited by technicians include hydraulic control wear in the valve body and shift solenoids, overheating from insufficient cooling or fluid condition, and occasional software calibration faults in the transmission control module. Some cases improve after software updates or valve‑body servicing, while others may require torque‑converter replacement or a full transmission rebuild or replacement. Always verify any claims with VIN‑specific recalls or service bulletins and obtain a professional diagnosis.

Common symptoms

Below are the signs most frequently associated with transmission trouble on the 2012 Ram 3500. If several appear together, a professional diagnostic is recommended.

Harsh or delayed shifting between gears, especially under load or during towing.

Slipping out of a gear or failing to stay in the selected gear.

Torque‑converter shudder or vibration at cruising speeds (often around 40–60 mph).

Overheating or reduced performance when towing heavy loads.

Transmission fluid leaks or a fluid level that is low or discolored.

Delayed engagement when shifting from Park or Reverse to Drive/Forward.

Unusual noises such as whining, clunking, or grinding during shifts.

Transmission warning light or stored diagnostic trouble codes related to shifting.

These symptoms often point to hydraulic control issues, wear in valve bodies or solenoids, or torque‑converter problems within the 68RFE transmission. A thorough diagnostic is advised to determine the exact cause.

Likely causes and typical fixes

Understanding common causes helps frame the repair options and expected costs. The following issues are frequently cited for 2012 Ram 3500 transmissions exhibiting the described symptoms.

Valve‑body wear and faulty shift solenoids, leading to incorrect hydraulic pressure and shifting errors. Fixes may include valve‑body rebuild or replacement and solenoid replacement.

Torque‑converter wear or failure, causing shudder, slipping, or harsh engagement. Fixes can involve torque‑converter replacement and related fluid/system checks.

Overheating due to towing, limited cooling, or low/poorly conditioned transmission fluid. Fixes include improving cooling (upgrading or adding an auxiliary cooler) and ensuring proper fluid level and quality.

Low or contaminated transmission fluid (ATF+4) and leaks from seals, pan gasket, or cooler lines. Fixes involve fluid change and repairing leaks.

Electrical/TCM software calibration or sensor faults causing improper shift timing. Fixes may include software updates or recalibration of the transmission control module (TCM).

General wear of internal components (clutch packs, bands, gears) from mileage and towing demands. Fixes range from a valve‑body or solenoid service to a full rebuild or replacement of the unit.

Conclusion: In many 2012 Ram 3500 cases, addressing hydraulic control and cooling issues plus software calibration is the first step. If diagnostics isolate a failing valve body, torque converter, or other major component, the repair approach will depend on severity and cost considerations. VIN‑specific recalls or service bulletins may apply, so check with a dealer.

What to do if you own a 2012 Ram 3500

If you’re experiencing transmission problems with a 2012 Ram 3500, follow these practical steps to diagnose and manage repairs responsibly.

Have the vehicle scanned for transmission‑related trouble codes at a dealer or a reputable shop, and check for any active recalls or service bulletins tied to your VIN.

Inspect transmission fluid level, color, and odor. ATF+4 should be reddish and not burnt; dark or foul-smelling fluid warrants service.

Look for external leaks around the transmission pan, seals, pan gasket, and cooler lines; address leaks promptly to avoid fluid loss and overheating.

Review the service history for prior transmission fluid changes, valve‑body or solenoid work, and software updates.

Discuss repair options with a qualified mechanic, including software calibration updates, valve‑body repair/rebuild, torque‑converter replacement, or a complete transmission replacement if needed.

Consider cooling upgrades if you tow frequently, such as an auxiliary transmission cooler or improved cooling capacity to reduce overheating risk.

Conclusion: Early diagnosis can reduce costs and prevent further damage. Always confirm any manufacturer recalls or TSBs for your specific vehicle and follow the guidance of a qualified technician.

Summary

The 2012 Ram 3500’s transmission problems are most often linked to the 68RFE six‑speed automatic paired with the 6.7L Cummins engine. Common symptoms include harsh or delayed shifts, slipping, torque‑converter shudder, and overheating. Root causes typically involve hydraulic control wear (valve body and solenoids), overheating, fluid issues, and occasional software faults. Diagnoses usually start with a code scan, fluid inspection, and leak checks, followed by targeted repairs such as valve‑body service, torque‑converter replacement, or, in severe cases, a full transmission rebuild. Checking for VIN‑specific recalls/TSBs is essential, and upgrading cooling can help with towing use. If you own a 2012 Ram 3500, engage a qualified technician promptly to avoid further damage and cost.)

Do Ram 3500 have transmission problems?

Ram 3500 often faces transmission hesitation and harsh shifting during gear changes under load. Lunging when shifting from Park to Drive or Reverse often indicates transmission or torque converter issues. Check the transmission fluid level and condition first; low or dirty fluid can cause harsh engagement.

What are the signs of a failing 68RFE transmission?

Common 68RFE Transmission Problems and How to Fix Them

Gear Slipping and Shuddering. Gear slipping is one of the most common issues in 68RFE transmissions, especially in high-mileage or tuned trucks.
Harsh or Delayed Shifting.
Overheating and Fluid Breakdown.
Torque Converter Failure.
Transmission Fails to Engage Gears.

What is the problem with the 2012 Dodge Ram 3500?

Common problems with the 2012 Ram 3500 include issues with the emissions system, such as a clogged diesel particulate filter (DPF) and a failing EGR cooler, along with turbocharger problems like failing VGT actuators and boost leaks. Other issues reported are transmission problems, especially in some chassis cab models that were subject to recalls, and potential head gasket failure on high-torque applications.
This video discusses common problems with the 6.7L Cummins engine, including issues with the DPF, EGR, and turbo: 58s8020 AutomotiveYouTube · Jan 13, 2023
Engine and emissions

Clogged DPF: In 2012 models, the DPF can clog due to a lack of Diesel Exhaust Fluid (DEF) and an inefficient regeneration strategy, leading to power loss.
Turbocharger issues: Problems include failing Variable Geometry Turbo (VGT) actuators and boost leaks, which can cause whistling and black smoke.
Head gasket failure: This is more likely to occur in models that produce high torque. Signs include white, sweet-smelling smoke from the exhaust and overheating.
EGR cooler failure: This is a common problem for modern diesel engines and is more likely with a clogged EGR valve, which can be addressed by cleaning or replacing the valve.
Fuel dilution: Fuel can mix with engine oil, leading to potential wear. Using an oil analysis can help monitor this issue.

This video demonstrates how to inspect an EGR cooler for leaks: 1mBackyard DieselzYouTube · Apr 20, 2018
Transmission

Sudden loss of power: Some heavy-duty automatic transmissions were recalled for potentially losing power suddenly.
Transmission bucking: Some owners have reported transmission bucking, which can sometimes be fixed by replacing the pressure solenoid in the transmission valve body.

What are the common problems with 6R140 transmission?

Common 6R140 transmission problems include harsh shifting, especially the 1-2 shift, which is often caused by worn intermediate clutches. Other issues include overheating, torque converter shudder, and problems with the valve body or solenoids. These problems can be related to mechanical wear, software issues, or problems with the cooling system or fluid level.

This video demonstrates the common problem of a hard 1-2 shift in a 6R140 transmission and explains its cause: 59sFlying WrenchesYouTube · Jul 1, 2023
Common problems and potential solutions

Harsh shifting:
- Cause: Worn intermediate clutches are the most common cause of a hard 1-2 shift. Faulty solenoids or a worn valve body can also cause harsh or erratic shifts, including skipping gears.
- Solution: A rebuild with upgraded clutches can fix the problem. Replacing the valve body or solenoids may also be a solution.
Overheating:
- Cause: Low fluid levels, a malfunctioning cooling system, or excessive strain from towing or hauling can cause overheating.
- Solution: Check and maintain the correct fluid level, and inspect and clean the transmission cooler. Avoid overloading the vehicle when possible.
Torque converter shudder:
- Cause: The torque converter's lock-up clutch can fail, especially under high power or load.
- Solution: Upgrading to a billet torque converter can often resolve this issue.
Fluid leaks:
- Cause: Leaks from seals or gaskets can lead to low fluid levels.
- Solution: Inspect and repair any leaks to ensure the correct fluid level is maintained.
Delayed engagement:
- Cause: A delay in engaging from Park to Drive or Reverse can be caused by worn clutches, low fluid, or control system issues.
- Solution: Check for leaks and ensure the fluid level is correct. A software update or mechanical repair may be necessary.
Software issues:
- Cause: Problems with the control software can cause shifting problems like slipping, delays, or "hunting" for gears.
- Solution: Check for and install any available software updates from the manufacturer.
Input shaft failure:
- Cause: In high-torque applications, the input shaft can twist or break.
- Solution: Upgraded, stronger input shafts are available for high-performance applications.

This video explains how a failure in the input shaft can lead to transmission failure: 1mVideo Service InformationYouTube · Mar 27, 2021

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.