Transmission Assembly for 2015 Kia Optima
Product Notes Read before buying
This transmission fits only 2015 Kia Optima models with the 2.4L engine (8th VIN digit '7') that were built in Korea from 04/28/2014. Please verify your vehicle's build date and VIN before ordering.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| EX | Sedan | 2015 | L4 2.4L | FWD | Automatic |
| EX Luxury | Sedan | 2015 | L4 2.4L | FWD | Automatic |
| Hybrid EX | Sedan | 2015 | L4 2.4L FULL HYBRID EV-GAS (FHEV) | FWD | Automatic |
| Hybrid LX | Sedan | 2015 | L4 2.4L FULL HYBRID EV-GAS (FHEV) | FWD | Automatic |
| LX | Sedan | 2015 | L4 2.4L | FWD | Automatic |
| SX | Sedan | 2015 | L4 2.4L | FWD | Automatic |
Know This Transmission Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this transmission family:
A quick look at your own vehicle makes sure the right transmission shows up:
- Confirm the 1st digit of the VIN is 'K' (built in Korea).
- Confirm the 8th digit of the VIN is '7' (2.4L gasoline engine).
- Confirm the vehicle production date on the door jamb is from 04/28/14.
- Locate the barcode sticker on top of the original bell housing and verify part number 45000-3B724.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support bar / hoist
- Subframe/transmission jack
- Torque wrench
- Bidirectional OBD-II scan tool
Budget for these consumables at install:
- Kia Genuine ATF SP-IV (7.1 to 10.0 Quarts for full system flush/dry fill)
- Front pump input shaft / torque converter seal
- Axle seals
- Transmission cooler-line flush solvent (or OEM cooler flushing kit Part # UM013 CH060)
What your vehicle’s computers will need after the swap:
What’s involved: TCM Adaptive Values Reset / Relearn
A TCM adaptive values reset must be performed using a compatible bidirectional scan tool immediately after installation, followed by a specific drive cycle. Skipping this step will cause severe shift shock, slipping, or delayed engagement.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque converter must be spun and pushed until it clicks/drops three distinct times to fully seat. Forcing the transmission to the engine block with an unseated converter will instantly crack the internal oil pump gear.
- The transmission filter is located deep inside the center of the case and cannot be serviced or replaced without completely splitting the transmission case in half.
- The front subframe must be perfectly aligned with its alignment dowels when bolting it back to the chassis to prevent steering and alignment issues.
- The post-install TCM adaptive value reset is mandatory to prevent premature clutch wear.
Easy to get right once you know them:
- Ordering by model year alone without verifying the VIN build location (Korea-built 'KNA' vs US-built '5XX').
- Using incorrect fluid types (such as older SP-III or generic multi-vehicle fluids) instead of SP-IV spec fluid.
- Checking the fluid level with the engine off or at the wrong temperature. The vehicle must be level, engine idling in Park, and fluid temperature between 122°F and 140°F.
- Skipping the transmission cooler and line flush, which introduces trapped debris from the failed unit into the replacement transmission.
Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Replace the internal wiring harness/sensor assembly if trouble codes P0711, P0712, or P0713 are triggered.
🔎 Recommended at install: Replace specific solenoids rather than the entire transaxle assembly.
🔎 Recommended at install: Rebuild or replace internal lip seals to restore fluid pressure.
🔎 Recommended at install: Perform TCM software updates to improve shift logic.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-63198-2079807). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2015 Kia Optima A6MF2 Transmission: Problems, Identification, and Used Replacement
Identify the correct Korea-built A6MF2 transaxle, understand common solenoid and sensor failures, and learn when to replace it with a used OEM unit.
Read Full Guide →Related Trouble Codes (OBD-II)
19 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Kia: 450003B724
Other: 1110005, 214-251, ADS4121L
Fits Years: 2015
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This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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