The 2021 Toyota Prius Prime has 15 automatic transmission parts with verified fitment on this page — 5 part types and 9 brands, covering the 1.8L L4 ELECTRIC/GAS engine. Each part includes a manufacturer part number and application notes.
On the 2021 Toyota Prius Prime, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. Most of the listed parts are Transmission Fluid (6 parts), Transmission Fluid Additive (4 parts) and Transmission Mount (3 parts). The other 2 part types cover the remaining 2 parts.
Every part on this page is matched to the 1.8L L4 ELECTRIC/GAS — the only engine offered in the 2021 Toyota Prius Prime.
The most listed brands for 2021 Toyota Prius Prime automatic transmission parts are LUBEGARD (5 parts), PENTOSIN (2 parts) and IDEMITSU (2 parts), plus 6 more brands. Quality grades include World Standard, CVT and Multi-Vehicle.
2 parts on this 2021 Toyota Prius Prime page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including MOBIL 126505 (Transmission Fluid) and IDEMITSU 30040096953 (Transmission Fluid). Click any part number to see every vehicle that part fits.
Drain Plug Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 652531CD | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the gaskets that seal the Drain Plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
One part is listed for the 2021 Toyota Prius Prime — DORMAN 652531CD.
Fluid Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN | ATPT9004 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Fluid pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit.
This group shows a single part: AISIN ATPT9004.
Transmission Fluid
ATF 64
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PENTOSIN | 1058113 | 🇺🇸 US 🇨🇦 CA | 1 LiterATF64 or ATF44 | View on Amazon |
| PENTOSIN | 1058215 | 🇺🇸 US 🇨🇦 CA | 5 LitersATF64 or ATF44 | View on Amazon |
CVT
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LUBEGARD | 68112 | 🇺🇸 US 🇨🇦 CA | Complete CVT Fluid32 oz | View on Amazon |
Multi-Vehicle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOBIL Popular | 126505 | 🇺🇸 US 🇨🇦 CA | Multi-Vehicle ATF | View on Amazon |
World Standard (WS)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| IDEMITSU Popular | 30040096953 | 🇺🇸 US | ATF Type TLS-LV5 Quart | View on Amazon |
| IDEMITSU | 30040096750 | 🇺🇸 US | ATF Type TLS-LV1 Quart | View on Amazon |
This table covers the automatic-transmission fluids specified for this gearbox. Typical signs include harsh or delayed shifts, fluid that smells burnt, or a shudder at light throttle. Use exactly the specification in the notes. Automatic transmissions are unforgiving of the wrong fluid.
6 Transmission Fluid parts for the 2021 Toyota Prius Prime come from 4 brands — PENTOSIN, IDEMITSU, LUBEGARD and 1 other brand. The "Popular" part is MOBIL 126505.
In the ATF 64 grade, PENTOSIN supplies 2 parts: grouped under the catalog's "ATF 64" designation — the notes column spells out what sets them apart. A representative part number is PENTOSIN 1058113.
In the CVT grade, LUBEGARD supplies 1 part: grouped under the catalog's "CVT" designation — the notes column spells out what sets them apart. A representative part number is LUBEGARD 68112.
The Multi-Vehicle section lists 1 option from MOBIL — grouped under the catalog's "Multi-Vehicle" designation — the notes column spells out what sets them apart. MOBIL 126505 is listed in this group.
The World Standard (WS) section lists 2 options from IDEMITSU — grouped under the catalog's "World Standard (WS)" designation — the notes column spells out what sets them apart. IDEMITSU 30040096953 is listed in this group.
Listed part numbers: MOBIL 126505, PENTOSIN 1058113 and PENTOSIN 1058215, plus the other parts above.
Transmission Fluid Additive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LUBEGARD | 61910 | 🇺🇸 US 🇨🇦 CA | 10 ozHighly Friction Modified ATF Supplement | View on Amazon |
| LUBEGARD | 67010 | 🇺🇸 US 🇨🇦 CA | Continuously Variable Transmission Recharge & Protect10 oz | View on Amazon |
| LUBEGARD | 61904 | 🇺🇸 US 🇨🇦 CA | Highly Friction Modified ATF Supplement5 Gallon | View on Amazon |
| LUBEGARD | 61955 | 🇺🇸 US 🇨🇦 CA | Highly Friction Modified ATF Supplement55 Gallon | View on Amazon |
This table covers the conditioners and additives used with this transmission fluid.
4 Transmission Fluid Additive parts for the 2021 Toyota Prius Prime come from LUBEGARD.
Part numbers include LUBEGARD 61910, LUBEGARD 67010 and LUBEGARD 61904, among others listed above.
Transmission Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ANCHOR | 10178 | 🇺🇸 US 🇨🇦 CA | Left | View on Amazon |
| DEA / MARMON RIDE CONTROL | A42134 | 🇺🇸 US 🇨🇦 CA | Left | View on Amazon |
| PIONEER | 620178 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the mounts that hold the transmission to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
3 Transmission Mount parts are listed for the 2021 Toyota Prius Prime, from ANCHOR, DEA / MARMON RIDE CONTROL and PIONEER.
Listed part numbers: ANCHOR 10178, DEA / MARMON RIDE CONTROL A42134 and PIONEER 620178.
Buying Automatic Transmission Parts for a 2021 Toyota Prius Prime
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Confirm you have the 1.8L L4 ELECTRIC/GAS engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Transmission Fluid and Transmission Fluid Additive .
Frequently Asked Questions
How many automatic transmission parts fit the 2021 Toyota Prius Prime?
Our catalog currently lists 15 automatic transmission parts for the 2021 Toyota Prius Prime across 5 subcategories and 9 brands, covering the 1.8L L4 ELECTRIC/GAS engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 2021 Toyota Prius Prime?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Toyota Prius Prime was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Toyota Prius Prime?
Every part on this page is matched to the 1.8L L4 ELECTRIC/GAS engine. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Toyota Prius Prime
Automatic Transmission Parts for Other Toyota Prius Prime Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.