P0868 on RAM: How to Diagnose & Fix
Transmission Fluid Pressure Low
2 RAM models · 5 documented issues · 3 critical · $150-$5,000 repair
P0868 on RAM by model: symptoms, diagnosis and fix
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, BD Diesel, or Suncoast triple-disc) 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.
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Sources for this issue (3)
The electronically-controlled 42RE/46RE automatics regulate shift points with a PWM governor pressure solenoid plus a governor pressure sensor/transducer in the valve body. These parts get contaminated by transmission varnish and wear out. When the sensor feedback no longer matches the commanded pressure, the PCM sets a code and drops the transmission into 'limp' mode — no overdrive, 2nd/3rd-gear start, harsh or no shifts. Extremely common on high-mileage 2nd-gen Rams.
Common Symptoms
- Transmission stuck in limp mode (2nd/3rd gear only)
- No overdrive / no lockup
- Wrong-gear starts
- Harsh or delayed shifts
- Speedometer-related shift errors
How to Fix
Drop the pan and replace the governor pressure solenoid (Mopar 4617210) and the governor pressure sensor/transducer (56028196AD, supersession of 56041403AA); available together as an aftermarket kit (e.g. Hercoo/TransGo). Fresh ATF+4 and a filter at the same time. DIY parts ~$40-$120; shop job $150-$500. Confirms and clears P0748/P1757/P0868 limp-mode codes.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- 1996-1999 42RE/46RE governor pressure transducer 56041403AA family
Verify transmission and connector.
- Mopar 4617210AA governor pressure solenoid
4617210/52118652 family used in supported electronic-governor Chrysler transmissions; confirm the truck's 42RE/46RE tag and VIN.
- 2000-2001 governor solenoid/transducer/filter-gasket kit
Confirm 42RE/46RE and that the included filter matches the pan.
- Mopar 68218057AB ATF+4, one quart
Verify manual and level procedure.
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Sources for this issue (2)
The 8-speed (ZF 8HP70 / TorqueFlite) develops a torque-converter clutch shudder felt as a vibration/judder around 30-50 mph light throttle, along with harsh downshifts, drive-engagement slam, and occasional limp mode (stuck in one gear with CEL). Root causes are degraded/aged transmission fluid and worn torque-converter clutch material, sometimes with valve-body or solenoid issues. Ram markets the trans as 'sealed/lifetime fill,' but ZF recommends fluid service every ~40-60k miles, and skipping it drives most of these complaints.
Common Symptoms
- Shudder/vibration at light throttle 30-50 mph
- Harsh or clunky downshifts
- Slam into drive/reverse
- Limp mode (stuck gear) with CEL
- Delayed or flaring shifts
How to Fix
Start with a proper fluid-and-filter service using the correct ZF 8HP fluid (many shudders clear up with fresh fluid) and apply the latest transmission software/TCM updates. If shudder persists, inspect/replace the torque converter; harsh-shift or limp events may require valve-body or solenoid repair. Adopt a 40-60k-mile fluid interval rather than the 'lifetime' claim to prevent recurrence.
Sources for this issue (2)
The Ram 1500's transmission thermal-management/oil-cooler unit is the only place where engine coolant and automatic transmission fluid pass close together. When this cooler ruptures internally, coolant and ATF cross-contaminate, producing a pink 'strawberry milkshake' in both the cooling system and the transmission. This is a serious failure: contaminated ATF degrades clutches and seals inside the ZF 8-speed and can destroy the transmission if driven on, while loss of coolant risks overheating. Owners report this occurring in the 70k-mile range and across multiple model years. It is distinct from the previously covered torque-converter shudder/harsh-shift issues because the root cause is a cooling/cross-contamination failure, not a hydraulic/valve-body or converter problem.
Common Symptoms
- Pink/milky 'milkshake' in coolant reservoir
- Milky or contaminated transmission fluid
- Low coolant with no external leak
- Overheating
- Harsh shifting or slipping after contamination
- Sweet coolant smell
How to Fix
Stop driving immediately if a milkshake mixture is found. Replace the failed transmission oil cooler/thermal unit (verified Mopar PN 68322494AD for 2019-2026), then completely flush the cooling system and perform repeated transmission fluid-and-filter changes (or a full flush) to purge coolant from the transmission. If clutch material is already contaminated, a transmission rebuild or replacement may be required. Verify with a road test and fluid inspection afterward.
Sources for this issue (3)
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 (locked in 3rd gear 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 3rd 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 (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: 2500, 1500.
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 $150 to $5,000 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.
Looking for P0868 on a different make?
View P0868 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.