6-Speed Automatic Transmission Assembly for 2016 Chevrolet Sonic
Product Notes Read before buying
This is a 6-speed automatic transmission for models with the 1.4L Turbo engine and Front-Wheel Drive. For the Chevrolet Sonic, this unit is specific to the RS trim, which has a unique 3.53 final drive ratio (broadcast code 6SAW). This part requires programming by a qualified technician for proper installation and operation.
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 |
|---|---|---|---|---|
| RS | Hatchback | 2016 | L4 1.4L Turbo | FWD | Automatic |
| RS | Sedan | 2016 | 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 the VIN is 'B' or 'M' to verify the 1.4L Turbocharged engine.
- Locate the Service Parts Identification sticker in the spare tire well and confirm RPO codes MH8 (6T40 transmission) and FXH (3.53 final drive ratio).
- Verify the vehicle is Front-Wheel Drive (FWD).
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support bar / fixture
- Transmission jack
- CV axle removal tools / axle seal installers
- J2534 pass-through programming tool or GM-compatible scan tool
Budget for these consumables at install:
- GM DEXRON-VI (6) Full Synthetic Automatic Transmission Fluid (approx. 4.2 to 6.3 quarts for service refill; 8.5 to 9.0 quarts for dry capacity)
- Torque converter hub seal (front pump seal)
- Left and right CV axle seals
- Professional aerosol transmission cooler-line flush (e.g., Kooler Kleen)
What your vehicle’s computers will need after the swap:
What’s involved: VIN-specific programming (GM Service Programming System / SPS2) and Transmission Adaptive Fast Learn
The integrated TEHCM is locked to the donor vehicle's VIN. If installed without programming, it will trigger DTC B3902 (Incorrect Immobilizer ID) and cause a no-crank/no-start or immediate limp-mode condition. Must be flashed using GM Techline Connect (SPS2) via a J2534 pass-through device.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must click and drop inward three distinct times. If not fully seated, bolting the transmission to the engine block will instantly crush and crack the oil pump gear, destroying the unit.
- Driver's Side Axle Play: Check for up-and-down play in the inner axle stub shaft. If play is present, the case bushing is worn and must be replaced (using a tool like Superior K0100 kit) along with a new seal to prevent immediate leaks.
- Fluid Level Check Procedure: No dipstick is present. Check must be performed with the vehicle level, engine idling in Park, transmission fluid warmed to 185°F to 203°F (85°C to 95°C), by removing the check plug on the side of the case.
- Bellhousing Dowel Pins: Ensure alignment dowel pins are present and correctly seated between the engine block and transmission bellhousing to prevent misalignment, seal leaks, or pump damage.
Easy to get right once you know them:
- Assuming 'Plug-and-Play' and skipping the mandatory TEHCM VIN-reprogramming step.
- Using the bellhousing bolts to force the transmission flush against the engine block when the torque converter is not fully seated.
- Skipping the transmission cooler line flush, which allows debris from the failed unit to contaminate and destroy the replacement transmission.
- Using incorrect fluid instead of licensed DEXRON-VI specification ATF.
- Incorrectly checking the fluid level (e.g., checking it cold, with the engine off, or when the vehicle is not level).
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: Physically check for axle play before installing; if play is present, install an upgraded wider bushing (such as Superior K0199 kit) and a new seal.
🔎 Recommended at install: Catastrophic failure causing sudden loss of 3rd, 5th, and Reverse gears; requires complete rebuild or replacement.
🔎 Recommended at install: Resolve with a software calibration update using GM's programming system.
🔎 Recommended at install: Can cause harsh shifting, slipping, or DTCs like P0776. Solenoid cleaning with a scan tool may help, but often requires TEHCM replacement.
🔎 Recommended at install: Vibration during light acceleration; caused by issues within the TCC or its controlling solenoid.
🔎 Recommended at install: Differentiates minor normal fluid seepage from a true leak requiring repair.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-05298-2444303). 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
2016 Chevrolet Sonic 1.4L Turbo 6T40 Transmission: Problems, Identification, and Used Replacement
Learn how to identify the correct 6T40 transaxle, diagnose common wave plate and TEHCM failures, and know when it is time for 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: 24263660, 24268368
Other: 6SAW
Fits Years: 2016
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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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