8HP75 Transmission Problems: 2019-2026 Ram Trucks

ByMr Shamrock Posted on Updated on

8HP75 transmission problems in Ram trucks almost always trace to one of three documented issues, each with its own Stellantis Technical Service Bulletin, its own diagnostic trouble codes, and its own fix.

2022 Ram 1500 with 8HP75 transmission problems
2022 Ram 1500 with 8HP75 transmission problems.

The 8HP75 is the standard automatic in the 2019 and newer DT-platform Ram 1500, the Ram 2500 and 3500 HD, and the 2022 to 2023 Wagoneer and Grand Wagoneer.

If your truck is a 2013 to 2018 Ram 1500, you have the earlier 8HP70 transmission instead, which carries a different set of bulletins and a different failure history.

This guide walks through the three confirmed 8HP75 problem patterns by symptom and DTC, tells you exactly which bulletin applies to your truck, and gives you the fix each one calls for. The first step is knowing which platform, engine, and symptom combination matches your situation.

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What Determines Your 8HP75 Transmission Problem

Ram 1500 check engine light transmission warning
Ram 1500 check engine light transmission warning.

Three variables determine which fix applies to your truck: platform and model year, the symptom you are experiencing, and which engine the 8HP75 is paired with.

Model Year And Platform

The DT-platform Ram 1500 (2019 and newer), Ram 2500 and 3500 HD, and the WS-platform Wagoneer and Grand Wagoneer (2022 to 2023) all use variants of the 8HP75, identified on the build sheet by sales code DFR or DFV.

Which bulletin applies depends on the exact model year range, since Stellantis issued separate fixes for 2019, 2020 to 2023, and 2025 production.

Symptom You Are Experiencing

The three patterns present differently. A Malfunction Indicator Lamp with the truck dropping into limp home mode points to one specific bulletin. A bump or jerk felt when the engine restarts after Auto Stop-Start, or on a light tip-in downshift, points to a different one.

A Malfunction Indicator Lamp with a long list of sensor-sounding codes but no real change in how the truck drives points to a third.

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Engine Pairing

The 5.7L Hemi V8 (sales code EZH), the 6.7L Cummins Turbo Diesel, and the 3.0L Hurricane HO and SO twin-turbo I6 (sales codes EFC and EFH) are all paired with 8HP75 variants, but the Hurricane pairing is new for the 2025 model year and has its own dedicated bulletin. Match your engine and model year to narrow down the branch below.

If You See Codes P0733 P1DA8 Or P1D92 Do This

If your Malfunction Indicator Lamp comes on with P0733-00, P1DA8-00, or P1D92-00 after your truck has at least 7,000 miles, and you have felt the transmission drop into limp home mode, this matches Stellantis Technical Service Bulletin 21-029-25, issued April 3, 2025.

The bulletin applies to 2020 to 2023 DT Ram 1500 pickups and 2022 to 2023 Wagoneer and Grand Wagoneer models built with the 8HP75 under sales code DFR. The cause is a worn or failing D clutch inside the transmission. The fix is not a software flash.

It requires a full internal teardown to inspect and replace the D clutch, along with new output shaft seals, a new lock ring, and an adaptation procedure once the transmission is reassembled. Stellantis lists official labor time at 5.5 hours for DT-platform trucks and 5.4 hours for the Wagoneer platform, plus additional time for 4×4 or all-wheel drive models.

This repair is reimbursable within the provisions of Stellantis’s warranty when performed under this bulletin, meaning owners still inside the 5 year or 60,000 mile powertrain warranty should not be paying out of pocket for it. If your truck is outside that window, get a written quote from a Ram dealer citing TSB 21-029-25 directly.

No verified independent or out-of-warranty price for this specific repair was available at the time of writing, and a dealer quote against the bulletin is the most reliable way to get an accurate number for your truck.

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If your symptoms show up differently, especially right after a start-stop event, the cause is different.

If You Feel A Bump During Start Stop Do This

A bump or jerk when the engine restarts after Auto Stop-Start, especially on a truck with fewer than 1,500 miles on it, points to a TCM calibration issue rather than a hardware fault.

This matches Technical Service Bulletin 21-015-25, issued February 5, 2025, for 2025 DT Ram 1500 pickups built on or before November 20, 2024, equipped with the 8HP75 (sales code DFR) paired with either the 3.0L Hurricane SO twin-turbo I6 (sales code EFH) or the Hurricane HO twin-turbo I6 (sales code EFC).

Customers reported the ESS bump in Normal and Snow modes, a bump on tip-in downshift in Normal or Sport mode, general shifting concerns under 1,500 miles, and the transmission not holding the correct gear on downgrades or during accelerator tip-out.

The fix is a Transmission Control Module reprogram using Stellantis’s wiTECH diagnostic tool, listed at 0.3 hours of labor. No parts are replaced. Like the D clutch bulletin, this repair is reimbursable within the provisions of the warranty, so a 2025 truck with these symptoms should not cost the owner anything at a dealer.

If your symptoms are just a warning light with a long code list and no real change in how the truck drives, check the third pattern below.

If Your MIL Shows Sensor Correlation Codes Do This

A long list of codes with no single obvious drivability symptom, especially P1DDE-00 or P1DF3-00, points to a sensor and module correlation fault rather than a failing clutch pack.

This matches Technical Service Bulletin 21-009-20, issued February 11, 2020, for 2019 DT Ram 1500 pickups built with the 5.7L Hemi V8 (sales code EZH) and the 8HP75 (sales codes DFR or DFV).

The bulletin lists a long set of possible codes, including P1DDE-00, P1DF3-00, P0733-00 while in 4-Lo range, P0716-00, P0721-00, P1DB6-00, P1DAB-00, P215C-00, P0607-00, and several input and output shaft speed sensor circuit codes.

Several of these are FCA-proprietary codes that a generic OBD-II reader will not pull correctly, so a dealer visit with a wiTECH scan tool is the only reliable way to confirm this pattern rather than guessing from a code list alone.

The fix is the same as the ESS bump pattern: a TCM reprogram, listed at 0.2 hours of labor and reimbursable under warranty. The updated software also folds in a long list of drivability refinements Stellantis bundled into the same flash,

including auto-start improvements and fixes for gear hunting during trailer towing, cold-temperature shift bumps, and coast-down downshift behavior. Owners with an early DT-platform truck who have had multiple minor shift complaints over time may find several of them resolved by this one bulletin.

Not sure which pattern matches your truck? Use the chart below.

8HP75 Transmission Problem Quick Reference Chart

Match your symptom to the row below to find your DTCs, affected trucks, TSB number, and fix.

SymptomDTCsAffected TrucksTSB NumberFix
MIL on, limp home modeP0733-00, P1DA8-00, P1D92-002020 to 2023 DT Ram 1500, 2022 to 2023 Wagoneer and Grand Wagoneer21-029-25D clutch inspect and replace, 5.4 to 5.5 hrs labor
Bump on start stop or tip-in downshiftNone required to qualify2025 Ram 1500 with Hurricane HO or SO engine, built before November 20, 202421-015-25TCM software reprogram, 0.3 hrs labor
MIL on, no real drivability change, long code listP1DDE-00, P1DF3-00, P0733-00 in 4-Lo, and others listed above2019 DT Ram 1500 with 5.7L Hemi21-009-20TCM software reprogram, 0.2 hrs labor

Whichever row matches your truck, get a proper dealer diagnosis with the TSB number in hand before assuming the worst.

Getting Your 8HP75 Diagnosed The Right Way

8HP75 transmission problems in Ram trucks are not one blanket failure story. They are three documented, separately bulletined issues, each tied to a specific model year range, engine pairing, and set of codes, and each with a known Stellantis fix.

A D clutch replacement under TSB 21-029-25 is a serious internal repair, while the ESS bump and sensor correlation patterns under TSB 21-015-25 and 21-009-20 are both resolved with a TCM software flash.

Confirm your truck is a DT Ram 1500, HD 2500 or 3500, or Wagoneer with the 8HP75 rather than an earlier 8HP70 truck, match your DTCs and symptoms to one of the three patterns above, and bring the specific TSB number to your service appointment. All three bulletins are reimbursable under warranty, so checking your truck’s warranty status before your appointment is worth the five minutes it takes.

Frequently Asked Questions About 8HP75 Transmission Problems

What years use the 8HP75 transmission in Ram trucks?

The 8HP75 is standard on the DT-platform Ram 1500 starting with the 2019 model year, on Ram 2500 and 3500 HD trucks from 2019 onward, and on the 2022 to 2023 Wagoneer and Grand Wagoneer. Earlier Ram 1500 trucks used the related but different 8HP70.

Is the 8HP75 the same as the 8HP70?

No. The 8HP70 was used in the 2013 to 2018 Ram 1500, while the 8HP75 replaced it starting with the 2019 DT-platform redesign. They share the same ZF gearset family but carry different sales codes, different internal parts, and different Stellantis bulletins.

What does limp mode mean on a Ram 8HP75 transmission?

Limp home mode locks the transmission into a reduced set of gears to protect it from further damage after the TCM detects an incorrect gear ratio, most commonly from the D clutch fault documented in TSB 21-029-25. It is the vehicle’s built-in fail-safe, not a sign the transmission has failed completely.

How much does an 8HP75 D clutch replacement cost?

If your truck is still within Stellantis’s 5 year or 60,000 mile powertrain warranty, this repair is reimbursable under TSB 21-029-25 and should not cost you anything at a dealer. Confirmed independent or out-of-warranty pricing was not available in current sources, so get a written quote citing the TSB if your warranty has expired.

Is the 8HP75 transmission reliable in the Ram 1500?

The 8HP75 has three documented issue patterns rather than a single widespread failure, and two of the three are resolved with a no-cost software update rather than a hardware repair. The more serious D clutch issue is limited to a specific 2020 to 2023 production window and is also covered under warranty when caught in time.

Author

  • Mr_Shamrock

    With more than two decades in the automotive world, Mr_Shamrock is Truckguider's go-to expert for Ford and Chevy Trucks. From the F-150 to the Silverado, his breadth of knowledge covers a wide range of models, making him a reliable resource for buyers, owners, and enthusiasts alike. His expertise is also featured in online communities like Truck Forums, where he offers valuable advice and reviews.

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