P0868 on RAM: How to Diagnose & Fix
Transmission Fluid Pressure Low
2 RAM models · 2 documented issues · 1 critical · $300-$4,800 repair
P0868 on RAM by model: symptoms, diagnosis and fix
RAM 1500s with the ZF-based 8-speed automatic (TorqueFlite 845RE / 850RE, 8HP70/8HP75) commonly develop torque-converter clutch shudder. It feels like a slight-to-heavy vibration or 'driving over rumble strips' at part throttle and light acceleration, typically 15-50 mph as the converter approaches lock-up. Owners frequently report it around the 70,000-80,000 mile range, often tied to degraded fluid friction-modifier and/or worn/glazed torque-converter clutch material. Severe cases drop into limp mode (stuck in a single gear, often reported as 4th, with a CEL). Harsh 1-2/2-3 upshifts are also reported and are often resolved by a TCM software reflash.
Common Symptoms
- Vibration/shudder at light throttle, ~15-50 mph, near converter lock-up
- Harsh or clunky 1-2 and 2-3 upshifts
- Burnt-smelling or dark transmission fluid
- Limp mode (stuck in one gear) with check engine light
How to Fix
First request all available TCM/transmission software updates (multiple TSBs/reflashes exist). A full fluid-and-filter service with the correct ZF spec fluid resolves a large share of early shudder cases. Persistent shudder after fluid/software typically requires torque-converter replacement or rebuild. Stellantis specifies long fluid intervals, but many owners service the fluid by ~60k miles preventively.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar 68218925AB 8 & 9 Speed ATF, one quart
Mopar 68218925AB fluid for applicable 8- and 9-speed units; verify the owner's/service information and required quantity for the exact transmission.
- Genuine Mopar 68225344AA 8HP70/8HP75 pan and integrated filter
Confirm VIN, engine and transmission sales code. Do not use for the 3.6L 845RE/850RE branch.
- Genuine Mopar 52854834AB 845RE/850RE pan and integrated filter
2018-2025 Ram 1500 3.6L applications shown by the OE catalog, including 845RE/850RE variants; confirm VIN and transmission code.
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Sources for this issue (5)
- FCA TSB 21-064-15: Flash: 8HP70 Transmission Shift Enhancements (2015 DS RAM 1500 5.7L)tsb
- TSB 21-014-15: Flash: 8HP70 Transmission Shift Quality and Drivability Enhancementstsb
- ZF 8HP (845RE/850RE/8HP75/8HP95) Transmission Problems, Symptoms & Fixes (DK Transmission)article
- Transmission - Torque Converter Slip / Shutter (RAM 1500 Diesel Forum)forum
- 8 SPD Transmission Shudder (RamForumZ)forum
The 68RFE 6-speed automatic behind the Cummins is prone to torque converter shudder and lockup failure. The factory converter's clutch material and heat control are marginal for the Cummins' torque, so the torque converter clutch (TCC) chatters, slips, or refuses to hold lockup, felt as a low-speed vibration like driving over rumble strips. The TCC regulator valve wears its bore in the valve body, making apply pressure erratic. The resulting heat contaminates the fluid and cascades into planetary and clutch-pack damage. Heat is the number-one killer, especially when towing; fluid temps regularly over 200°F accelerate failure.
Common Symptoms
- Shudder/vibration around 40-55 mph (converter lockup)
- Slipping or flaring on lockup
- High transmission temperatures when towing
- Harsh or delayed shifts
- Burnt-smelling ATF+4 fluid
- Check engine light with TCC codes
How to Fix
Replace the torque converter with a stronger billet/multi-disc unit (e.g., Sun Coast triple-disc or BD Diesel) rather than another stock converter. Rebuild or upgrade the valve body / TCC regulator valve (Sonnax) to restore correct apply pressure. Add an auxiliary transmission cooler and use the correct ATF+4 fluid, and consider a deep pan and improved fluid capacity for towing. Address early to avoid a full transmission rebuild.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- BD Diesel 1070220X ProForce enhanced-stall 68RFE torque converter
Restrict approval to manufacturer-cataloged 2007.5-2018 Ram 2500/3500 6.7L with 68RFE; verify early-2011 six- versus eight-bolt configuration and core terms. Do not extrapolate seller claims through 2024 without PI-curve/year confirmation.
- Genuine Mopar 68218058AC ATF+4 fluid
ATF+4/MS-9602 applications only; confirm container size, exact service quantity and current service information.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
P0868 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0868 mean on a RAM?
P0868 stands for "Transmission Fluid Pressure Low." This code indicates the transmission's internal fluid pressure is reading lower than the computer expects for current operating conditions. The transmission control module uses a pressure sensor to monitor line pressure, which is what applies the clutches and bands that engage gears. When that pressure stays below the target threshold, P0868 sets. Low line pressure can cause slipping, harsh or delayed shifts, and in severe cases internal clutch damage, so it should be addressed promptly. On RAM it is documented across 2 models: 1500, 2500.
What are the most common causes of P0868?
The most common causes of P0868 are: Low transmission fluid level, Worn or stuck-open pressure control solenoid, Internal leak (worn seals, gaskets, or valve body), Faulty transmission fluid pressure sensor, Clogged transmission filter, Failing transmission (oil) pump, Worn or leaking valve body, Wiring or connector fault to the pressure sensor/solenoid. The specific cause varies by vehicle.
How much does it cost to fix P0868 on a RAM?
Published repair estimates on RAM range from $300 to $4,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.