10-Speed Automatic Transmission Assembly for 2019 Cadillac CT6
Product Notes Read before buying
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 |
|---|---|---|---|---|
| Platinum | Sedan | 2019 | V6 3.0L Turbo | AWD | Automatic |
| Sport | Sedan | 2019 | V6 3.0L Turbo | AWD | 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 '6' to confirm the 3.0L Twin Turbo V6 (LGW engine).
- Scan the QR code sticker on the driver's door jamb B-pillar or locate the silver RPO sticker in the trunk/glove box to confirm codes 'LGW' and 'MHS' or 'MHW' are listed.
- Physically inspect the barcode sticker on the right side of the current transmission case to confirm GM part number 24269983 and broadcast code 9SWJ.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- heavy-duty transmission jack
- fluid transfer pump with specialized GM bottom-fill pan adapter
- professional-grade diagnostic scan tool with GM GDS2/SPS2 programming capability
- digital torque wrench for low-torque, angle-spec stretch bolts
- engine support bar
- cooler line flush machine
- cooler line disconnection tools (e.g., DT-52263)
Budget for these consumables at install:
- ACDelco DEXRON ULV (Ultra-Low Viscosity) ATF
- ACDelco TF937 (GM Part #24294355) filter
- GM Part #24297886 pan gasket
- GM Part #24050764 one-time-use filter stretch bolts
- Torque converter hub seal / front pump seal
- AWD output shaft seals
- High-pressure transmission cooler line flush solvent
What your vehicle’s computers will need after the swap:
What’s involved: Solenoid Characterization Strategy Update (TRID data) and Service Fast Learn (SFL) adaptive relearn procedure.
The TCM must be reprogrammed with the vehicle's specific VIN and software calibration using GM's Service Programming System (SPS2). Additionally, the 13-digit strategy code and 12-digit ID code (TRID data) stamped on the transmission case must be programmed. A Service Fast Learn adaptive procedure must then be completed to calibrate clutch fill times.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must rotate and push the converter until it fully engages all three stages of the internal pump gears (three distinct drops). Failure to do so will crack the internal oil pump rotor upon bolting to the engine.
- Bottom-Fill Fluid Level Procedure: No dipstick is present. Must fill from the bottom pan plug using a fluid pump. The vehicle must be level, engine idling, and transmission fluid temperature strictly between 167°F and 178°F (75°C to 81°C) when checking the level.
- Exhaust and Subframe Alignment: Exhaust pipes run directly beneath the transmission pan and must be dropped to gain clearance. Be prepared for seized exhaust flange bolts.
- Cooler Line Flush: Debris from the previous transmission failure will circulate and destroy the replacement unit if the cooler and lines are not professionally flushed.
- Adaptive Learn Procedure: Skipping the 'fast learn' adaptive procedure will result in poor shift quality and potential immediate clutch damage.
Easy to get right once you know them:
- Reusing the single-use aluminum filter-to-valve-body stretch bolts, which can snap or back out, causing the filter to fall and starve the transmission of oil.
- Using the wrong fluid, such as Dexron VI or universal ATF, instead of the required DEXRON ULV.
- Skipping the TCM programming and Service Fast Learn procedure, leading to incorrect clutch pressures and immediate transmission damage.
- Checking the fluid level cold or with the engine off, resulting in severe underfill or overfill.
- Not flushing the transmission cooler and lines before installing the replacement unit.
- Ignoring open recalls and service updates, failing to ensure the control modules have the most current corrected software.
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: GM dealer to install updated Transmission Control Module (TCM) software to detect wear and put vehicle into limited-gear limp mode before lock-up occurs; physical valve body wear requires mechanical repair.
🔎 Recommended at install: GM extended the warranty on the valve body to 15 years or 150,000 miles.
🔎 Recommended at install: Install a specialized repair kit containing an updated feed-limit valve, spring, and spacer plate instead of replacing the entire valve body.
🔎 Recommended at install: Dealer to reprogram the Engine Control Module (ECM).
🔎 Recommended at install: Dealer to reprogram the Engine Control Module (ECM).
🔎 Recommended at install: Ensure the correct, most up-to-date fluid (DEXRON ULV) is used and all software updates are applied.
🔎 Recommended at install: Legal remedy pending.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-11699-5308565). 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
2019 Cadillac CT6 3.0L Twin Turbo Transmission: Problems, Identification, and Used Replacement
The 10L90 transmission in the 3.0L CT6 is plagued by valve body wear and harsh shifting. Learn how to identify your unit, what fails, and when to replace it with a used OEM assembly.
Read Full Guide →Related Trouble Codes (OBD-II)
2 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: 24269983
Fits Years: 2019
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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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