6-Speed Automatic Transmission Assembly for 2015 Buick Verano
Product Notes Read before buying
This is a 6-speed automatic transmission for models with the 2.4L engine only. Please verify your vehicle has transmission option code MH8 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 |
|---|---|---|---|---|
| Base | Sedan | 2015 | L4 2.4L FLEX | FWD | Automatic |
| Convenience | Sedan | 2015 | L4 2.4L FLEX | FWD | Automatic |
| CX | Sedan | 2015 | L4 2.4L FLEX | FWD | Automatic |
| CX | Sedan | 2015 | L4 2.4L | FWD | Automatic |
| Leather | Sedan | 2015 | L4 2.4L FLEX | 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:
- Verify the 8th digit of the vehicle's VIN is 'K' (indicates 2.4L naturally aspirated engine).
- Verify the RPO code 'MH8' is present on the Service Parts Identification sticker in the glove box or trunk.
- Verify the 8th digit of the barcode string on the TCM front cover is a letter (indicates Generation 2).
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support bar
- Transmission jack
- Axle popper tool or pry bars
- Torque converter holding tool (GM J-46409)
- Professional-grade scan tool with J2534 pass-thru programming capability
Budget for these consumables at install:
- GM Dexron VI (6) synthetic automatic transmission fluid
- Torque converter hub seal (front pump seal)
- Left and right axle shaft seals
- Transmission cooler line flush aerosol
- TEHCM filter plate gasket (if swapping original TEHCM)
What your vehicle’s computers will need after the swap:
What’s involved: VIN-specific dealer programming (GM Service Programming System / SPS) and TCM adaptive relearn ('Fast Learn')
The internal TCM (TEHCM) is programmed with the donor vehicle's VIN. It must be reprogrammed to the recipient vehicle's VIN using a dealer-level scan tool (such as GM MDI/GDS2) or high-end aftermarket equivalent. A 'Fast Learn' adaptive relearn must also be performed before driving.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Ensure the torque converter is fully seated (three distinct drops/clicks) before bolting to the engine to avoid cracking the fluid pump rotor.
- Fluid Level Check Procedure: The 6T40/6T45 has no dipstick. Fluid level must be checked via the level-check plug on the side of the case with the engine idling, vehicle level, and fluid temperature strictly between 85C and 95C (185F to 203F).
- Cooler Line Flush: You must perform a comprehensive flush of the transmission cooler lines to prevent old debris from destroying the replacement unit.
- Dowel Pin Alignment: Ensure alignment dowel pins are clean and in place; do not use bolts to pull the transmission to the engine.
Easy to get right once you know them:
- Skipping the 'Fast Learn' adaptive relearn procedure before driving, which can burn up clutches.
- Reusing the old torque converter, which introduces contaminated fluid and metal shavings into the replacement unit.
- Using incorrect or generic multi-vehicle ATF instead of licensed GM Dexron VI.
- Attempting to swap generations (e.g., installing a Gen 1 6T40 into a Gen 2 vehicle).
- Ignoring the absolute requirement for TCM VIN programming.
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: NHTSA Recall 16V-502 (GM Recall 50490 / 50491) - Shifter/ignition interlock issue
🔎 Recommended at install: NHTSA Campaign Number 14V152000 (Recall)
🔎 Recommended at install: TSB PI0324F
🔎 Recommended at install: TSB PI0780A - Avoid operating with contaminated fluid
🔎 Recommended at install: GM TSB #PI0785B / #150089004C - Replace torque converter seal anytime transmission is removed
🔎 Recommended at install: Check axle play and replace bushing using aftermarket repair kit before install
🔎 Recommended at install: Replace torque converter; check for updated GM procedures
🔎 Recommended at install: Replace TCM / TEHCM assembly
Researched from factory recalls, TSBs and OEM service data (reference unit 400-05162-2067565). 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 Buick Verano 2.4L GF6 Transmission: Problems, Identification, and Used Replacement
Identify the exact MH8 6T40 transmission for your 2015 Verano, understand common failures like the 3-5-R wave plate, and learn when to replace it with a used OEM unit.
Read Full Guide →Related Trouble Codes (OBD-II)
4 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:
Buick: 24262612, 24263366
Other: 5AHW
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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