2.5L DOHC SIDI VVT Engine Complete Assembly for 2017-2020 Buick Envision
Product Notes Read before buying
This engine fits All-Wheel Drive (AWD) models only. It will not fit Front-Wheel Drive (FWD) vehicles. Please verify your vehicle has the 2.5L engine (8th digit of VIN is 'A') and is AWD 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 | SUV | 2017 | L4 2.5L | AWD | Automatic |
| Essence | SUV | 2017 - 2020 | L4 2.5L | AWD | Automatic |
| Preferred | SUV | 2017 - 2020 | L4 2.5L | AWD | Automatic |
| 2018 - 2019 |
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 'A'.
- Confirm the vehicle is All-Wheel Drive (AWD) by checking the rear axle for a differential/drive axles or checking the rear liftgate/window sticker.
- Locate the Engine RPO Code LCV on the Service Parts Identification label (usually in the glovebox or trunk area under the spare tire cover).
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- EN-50656 Timing Chain Holding Tool
- EN-50793 Camshaft Locking Tool
- EN-50790 High-Pressure Fuel Pump Lobe Alignment Tool
- Professional-grade scan tool (GM GDS2 / Tech2Win / J2534 device)
- Engine hoist
- Engine stand
- Torque wrenches
- Fuel line disconnect tools
Budget for these consumables at install:
- 6.0 quarts of Dexos1 Gen 2 or Gen 3 approved synthetic 5W-20 engine oil (0W-20 approved alternative for cold climates)
- New high-quality oil filter (e.g., ACDelco PF64)
- Fresh GM Dex-Cool (50/50 pre-diluted) coolant (system capacity approx 9.6 quarts)
- New pre-gapped Iridium spark plugs
- Intake and exhaust manifold gaskets
- Thermostat housing and water outlet gaskets
- Rear Main Crankshaft Seal
- High-Pressure Fuel Pump O-Ring
- Single-use High-Pressure Fuel Pipe (GM part number 12627128)
- New Engine Oil Cooler and Hoses (mandatory if original engine suffered bearing failure)
What your vehicle’s computers will need after the swap:
What’s involved: Crankshaft Position (CKP) System Variation Relearn (Crank / CASE Relearn)
Whenever the engine block, crankshaft, or crankshaft position sensor is replaced or disturbed, a Crank Relearn must be performed using a dealer-level scan tool (such as GM GDS2 or Tech2Win). Failure to perform this relearn will trigger false misfire codes (P0300), correlation codes (P0016/P0017/P1336), and cause the engine to run in a degraded state.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- High-Pressure Fuel Pump Installation (Lobe Position): Ensure the camshaft lobe driving the pump is on its base circle using tool EN-50790 before bolting down to prevent bending the plunger.
- Single-Use Fuel Pipe: The high-pressure fuel pipe is a single-use crush-seal design. Do not reuse it; torque precisely to GM specifications to prevent high-pressure fuel leaks.
- AWD Transfer Case (PTU) Alignment: Ensure splines are perfectly aligned and mounting bolts are torqued in sequence when mating the PTU to prevent cracking the engine block mounting ears.
- Camshaft Cap Torque Sequence: Camshaft cap bolts must be tightened in a highly specific sequence and torque pattern to prevent binding or snapping the camshafts.
- Torque-to-Yield (TTY) Bolts: Critical fasteners are designed for one-time use and must be replaced if removed.
- Direct Injection Fuel System: De-pressurize the system before disconnecting any fuel lines to prevent injury and fire risk.
Easy to get right once you know them:
- Reusing the High-Pressure Fuel Pipe: Reusing the old crush-seal pipe almost always causes dangerous fuel leaks under extreme pressure.
- Not Replacing the Oil Cooler After Bearing Failure: Failing to replace the oil cooler and hoses after a spun bearing allows trapped metal debris to wash into and destroy the new engine.
- Forgetting the Crank Relearn: Assuming the engine will learn on its own, leading to persistent check engine lights (P0300, P0017, P1336) and failed emissions tests.
- Ordering for a FWD Vehicle: Attempting to install this AWD-spec engine into a FWD Buick Envision where the oil pan and intermediate shaft mounting provisions do not clear or align.
- Ignoring the VIN Code: Failing to verify that the 8th digit of the VIN is 'A'.
- Using Incorrect Oil: Using conventional oil or the wrong viscosity instead of the specified 5W-20 dexos1-rated synthetic oil.
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: GM dealers will replace the high-pressure fuel pump and high-pressure fuel pipe free of charge.
🔎 Recommended at install: Complete engine replacement. The installer must replace the engine oil cooler and its hoses concurrently to prevent debris contamination.
🔎 Recommended at install: Clean all ice, sludge, water, and carbon out of the PCV pipes, hoses, and orifices. Replace the rear main seal if it has blown.
🔎 Recommended at install: Remove, clean, and reseal the lower oil pan using fresh RTV sealant.
🔎 Recommended at install: Check the oil level regularly. GM considers consumption of up to one quart per 2,000 miles to be within normal operating parameters. A faulty PCV valve can sometimes contribute.
🔎 Recommended at install: Long-term maintenance cleaning of intake valves to address carbon deposits common to direct-injection engines.
Researched from factory recalls, TSBs and OEM service data (reference unit 300-10053-4632928). 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
2017-2020 Buick Envision 2.5L LCV Engine: Problems, Identification, and Used Replacement
Identify the 2.5L LCV, understand what causes catastrophic failure, and learn what to check before buying a used OEM replacement engine.
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: 12675963
Fits Years: 2017 2018 2019 2020
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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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