6-Speed Automatic Transmission Assembly for 2015 Chevrolet Sonic
Product Notes Read before buying
This is a 6-speed automatic transmission for 1.4L turbocharged engines. It has a 3.53 final drive ratio. This part may require programming by a qualified technician to ensure proper operation in the vehicle.
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 |
|---|---|---|---|---|
| LT | Hatchback | 2015 | L4 1.4L Turbo | FWD | Automatic |
| LT | Sedan | 2015 | L4 1.4L Turbo | FWD | Automatic |
| LTZ | Hatchback | 2015 | L4 1.4L Turbo | FWD | Automatic |
| LTZ | Sedan | 2015 | L4 1.4L Turbo | 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 8th digit of your VIN is B (signifying the 1.4L Turbo engine).
- Locate the silver Service Parts Identification sticker (in the glove box or spare tire well) and confirm the RPO code is MH8 or MHH.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support bridge/fixture
- Transmission jack
- GM-compatible professional scan tool (GM MDI, Tech2, or GDS2)
- Torque converter depth measurement tool
- Cooler line disconnect tools
Budget for these consumables at install:
- Dexron VI (Dexron 6) ATF (Service Refill: ~4.2 to 6.3 quarts; Dry/Overhaul: ~7.4 to 9.5 quarts)
- Torque converter input shaft seal (front pump seal)
- CV axle seals (both sides)
- Aerosol transmission cooler flush
- Transmission filter and pan gasket (sources differ on filter serviceability — confirm with us before install)
What your vehicle’s computers will need after the swap:
What’s involved: VIN Programming and/or Transmission Adaptive Values Learn
If using the TEHCM that comes on the replacement unit, you must program the TCM to your vehicle's VIN using GM's Service Programming System (SPS2). If swapping your original TEHCM, no VIN programming is required, but a Transmission Adaptive Values Learn (Fast Learn) must still be performed using a GM-compatible scan tool.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- The 1-Inch Torque Converter Rule: Ensure the torque converter is fully seated and recessed by at least 1 inch (25.4mm) from the bellhousing face before bolting to the engine to avoid cracking the internal fluid pump rotor.
- Dowel Pin Check: Ensure two alignment dowel pins are present in the engine block.
- No-Dipstick Fluid Level Procedure: Check fluid level via the side check plug only when the vehicle is level and transmission fluid temperature is between 185°F and 203°F (85°C to 95°C).
- Cooler Line Flush: Must perform a complete flush of the transmission cooler and lines to prevent debris from ruining the replacement unit.
- Flexplate Bolt Inspection: Inspect the flexplate for cracks and use correct bolts and torque procedures.
Easy to get right once you know them:
- Reusing the old torque converter, which traps metal shavings and ruins the replacement unit.
- Skipping the Transmission Adaptive Values Learn (Adaptive Relearn) procedure, leading to harsh shifting or slipping.
- Using incorrect, non-Dexron VI fluid.
- Improperly checking or filling fluid due to the lack of a dipstick.
- Not replacing the axle and torque converter seals during installation.
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: Dealer replacement of the turbine shaft.
🔎 Recommended at install: Address debris or electrical faults within the TEHCM.
🔎 Recommended at install: Replace worn driver's side CV axle bushing inside the case to prevent continuous seal leaks.
🔎 Recommended at install: Engine RPM surge or hesitation when cruising between 55 and 70 mph in 6th gear.
🔎 Recommended at install: Distinguish between minor weep and active leak requiring seal replacement.
🔎 Recommended at install: Perform adaptive relearn or check fluid level/type.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-05136-2288933). 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 Chevrolet Sonic 1.4L Turbo 6T40: Problems, Identification, and Used Replacement
Identify the MH8/MHH 6T40 transaxle, understand common TEHCM and turbine shaft failures, and learn when to swap in a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
6 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:
GM: 24263616
Other: 5GDW
Fits Years: 2015
Your Go-To Place
for auto parts.
In operation since 2007. Trusted by over a million DIYers, mechanics, and body shops across all 50 states.
Confirmed Before It Ships
Every freight order is confirmed through a short guided interview — fitment, condition, delivery and warranty terms, e-signed before you're charged.
Trusted Since 2007
Nearly two decades of shipping parts to professionals & enthusiasts.
Backed By The Selling Yard
This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
What buyers are saying.
Racing Partner Videos
