3.6L Engine Complete Assembly for 2017-2025 Cadillac, Chevrolet, & GMC
Product Notes Read before buying
This engine fits only models equipped with the 3.6L V6 engine (8th VIN digit 'S', RPO code LGX) AND the heavy-duty cooling system (RPO code V08). For Cadillac XT6 models from 2023-2025, this engine is only compatible with vehicles that do NOT have the hands-free self-driving feature. Please verify your vehicle's specifications 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 |
|---|---|---|---|---|
| Luxury | SUV | 2020 - 2025 | V6 3.6L | FWD | Automatic |
| Premium Luxury | SUV | 2020 - 2025 | V6 3.6L | FWD/4WD | Automatic |
| Sport | SUV | 2020 - 2025 | V6 3.6L | 4WD | Automatic |
| 2021 - 2024 |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Premium Luxury | SUV | 2020 - 2025 | V6 3.6L | FWD/4WD | Automatic |
| Sport | SUV | 2020 - 2025 | V6 3.6L | 4WD | Automatic |
| 2021 - 2024 |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Base | SUV | 2019 | V6 3.6L | AWD | Automatic |
| Base | SUV | 2019 - 2021 | V6 3.6L | FWD | Automatic |
| Premier | SUV | 2019 - 2025 | V6 3.6L | FWD | Automatic |
| Premier | SUV | 2019 - 2022 | V6 3.6L | AWD | Automatic |
| RS | SUV | 2019 - 2025 | V6 3.6L | FWD | Automatic |
| RS | SUV | 2019 - 2022 | V6 3.6L | AWD | Automatic |
| True North | SUV | 2019 - 2022 | V6 3.6L | AWD | Automatic |
| LT | SUV | 2020 - 2025 | V6 3.6L | FWD | Automatic |
| LT | SUV | 2020 - 2022 | V6 3.6L | AWD | Automatic |
| LT | SUV | 2023 - 2025 | V6 3.6L | 4WD | Automatic |
| Premier | SUV | 2023 - 2025 | V6 3.6L | 4WD | Automatic |
| RS | SUV | 2023 - 2025 | V6 3.6L | 4WD | Automatic |
| True North | SUV | 2023 - 2025 | V6 3.6L | 4WD | Automatic |
| RS Bitono | SUV | 2024 | V6 3.6L | FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Denali | SUV | 2017 - 2023 | V6 3.6L | FWD/4WD | Automatic |
| Denali | SUV | 2017 - 2022 | V6 3.6L | AWD | Automatic |
| SLE | SUV | 2017 - 2023 | V6 3.6L | FWD/4WD | Automatic |
| SLT | SUV | 2017 - 2023 | V6 3.6L | FWD/4WD | Automatic |
| SLT | SUV | 2018 | V6 3.6L | AWD | Automatic |
| All Terrain | SUV | 2019 | V6 3.6L | AWD | Automatic |
| AT4 | SUV | 2020 - 2022 | V6 3.6L | AWD | Automatic |
| AT4 | SUV | 2020 - 2023 | V6 3.6L | 4WD | Automatic |
| Black | SUV | 2021 | V6 3.6L | AWD | Automatic |
| Black | SUV | 2022 - 2023 | V6 3.6L | FWD | Automatic |
Know This Engine Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this engine family:
A quick look at your own vehicle makes sure the right engine shows up:
- Verify the 8th digit of the VIN is 'S'.
- Verify the RPO codes list both 'LGX' and 'V08'.
- For 2017 Acadia, verify the 11th digit of the VIN is 'Z'.
- Confirm if vehicle is FWD or AWD.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- EN-51077 / EN-51077-A Camshaft holding tool
- EN-48219 Turbine shaft seal installer/sizer
- GM-Compatible Bidirectional Scan Tool (MDI2 with GDS2)
Budget for these consumables at install:
- SAE 5W-30 motor oil meeting GM dexos1 Gen 2 or Gen 3 specification
- Oil filter
- GM-approved Dex-Cool coolant (50/50 pre-diluted)
- OE-spec iridium spark plugs
- Upper and lower intake manifold gaskets
- Exhaust manifold gaskets
- Thermostat gasket
- Front and rear crankshaft main seals
What your vehicle’s computers will need after the swap:
What’s involved: Crankshaft Position (CKP) System Variation Learn
A GM-compatible bidirectional scan tool (GDS2, Snap-on, or Autel) is required to perform the Crankshaft Position Relearn. Immobilizer system may also require a security relearn.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- AWD vs FWD oil pan configuration: AWD models require a specific oil pan and structural brackets to clear the PTU.
- One-time-use high-pressure fuel lines: Must replace metal high-pressure fuel pipes connecting the pump to the rails.
- Torque-to-yield (TTY) bolts: Crankshaft balancer bolt and camshaft sprocket bolts must be replaced.
- Ground strap connection: Ensure main engine ground strap near starter is clean and secure to prevent electrical codes.
Easy to get right once you know them:
- Ignoring the Heavy Duty Cooling option (V08) requirement.
- Losing the plastic oil filter adapter bypass insert during accessory transfer or oil changes.
- Reusing high-pressure fuel pipes, causing fuel leaks.
- Skipping the mandatory Crankshaft Position Relearn procedure.
- Mixing up FWD and AWD oil pan/bracket configurations.
Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Replace dual-function stationary hydraulic lash adjusters or rocker assemblies.
🔎 Recommended at install: Replace factory thermostat.
🔎 Recommended at install: Perform manual or chemical intake valve cleaning.
🔎 Recommended at install: Ensure plastic bypass insert/center tube is not discarded during oil changes.
🔎 Recommended at install: Reseal the carrier seam without removing cylinder heads.
Researched from factory recalls, TSBs and OEM service data (reference unit 300-05172E-4268081). 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
Related Trouble Codes (OBD-II)
45 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: 12645753, 12647615, 12655002, 12669521, 12674037, 12711500, 12716560, 12735951
Fits Years: 2017 2018 2019 2020 2021 2022 2023 2024 2025
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Backed By The Selling Yard
This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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