22
verified 2020 gmc engines
2020 Used GMC Engines For Sale
22 verified 2020 GMC engines in stock — Sierra 1500 (2.7L L3B, 4.3L LV3, 5.3L L82/L84, 6.2L L87, 3.0L LM2 Duramax diesel), Sierra 2500 (6.6L L8T gas, 6.6L L5P Duramax diesel), Yukon & Yukon XL (5.3L L83, 6.2L L86), Suburban 1500 (5.3L L83, 6.2L L86), Canyon (2.5L LCV, 3.6L LGZ, 2.8L LWN diesel), and Terrain (1.5L LYX, 2.0L LTG). VIN-matched to your vehicle, compression-tested by ASE-certified technicians, photographed before shipment, backed by up to a 3-year warranty plus 30-day money-back. Free freight nationwide.
●
Compression-Tested & Verified
●
Free Nationwide Shipping
Browse 2020 GMC Engines by Model
Pick your 2020 GMC model to see exact fitments in stock. Not sure which engine code (RPO) fits? Text us your VIN and a specialist confirms the match.
Why Buy a 2020 GMC Engine from Auto Power Source
Every 2020 GMC engine in our inventory is pulled from a low-mileage donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale. Each unit goes through our six-step inspection — VIN-matching, compression testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping.
Our ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before any 2020 GMC engine is cleared for sale. You pay a fraction of dealer-new pricing for identical GM engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and get up to a 3-year warranty plus 30-day money-back. Not sure whether your truck runs the L82 or L84 5.3L, or a gas L8T versus an L5P diesel? Text your VIN and we will confirm.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 2020 GMC Engine Options: Compared
Most 2020 GMC owners face four real choices when their engine fails:
← Swipe sideways to see all columns →
| Option |
Cost |
Reliability |
Warranty |
Fitment Match |
| Used OEM (this collection) |
$$$ Best Value |
High |
Up to 3 years |
VIN-matched |
| New OEM (dealer) |
$$$$$ 2-4× more |
High |
Manufacturer |
Exact |
| Aftermarket / Reman |
$$$$ |
Varies |
6-12 mo |
May adapt |
| Junkyard |
$ Cheapest |
Unknown |
None |
DIY |
Tested used OEM hits the sweet spot — same GM engineering as new, fraction of the cost.
2020 GMC Engine Buying Guide
-
Confirm the 8th-digit VIN and RPO code. 2020 GMC distinguishes the 5.3L L82 from the L84, and the 6.2L L86 from the L87, this way — same displacement can be a different engine.
-
Match gas vs diesel on HD trucks. The 2020 Sierra 2500 ships with the 6.6L L8T gas V8 or the 6.6L L5P Duramax diesel — completely different engines and mounts.
-
Check drivetrain (2WD vs 4WD). The Canyon and Sierra come in both; oil pan, brackets, and accessories can differ.
-
Note the small-displacement turbos. The Sierra 1500 2.7L L3B and Terrain 1.5L LYX / 2.0L LTG are turbocharged — verify the exact code, not just the litres.
-
Always run the donor VIN if available. We provide it on request for any engine in our inventory to verify mileage and history.
Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.
Frequently Asked Questions
What is the warranty on a 2020 GMC engine?
Up to 3 years, depending on the specific unit. The exact warranty term is listed on each product page.
What does compression-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before the engine is cleared for sale.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days via freight carrier after dispatch.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit are sent before payment.
Do I need my VIN?
Strongly recommended. 2020 GMC engines vary by RPO code, drivetrain, and gas/diesel configuration.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
Excellent
Customer Reviews
rated on Trustpilot
Our 6-Step Inspection & Shipping Process
Every 2020 GMC engine we ship has been through these six steps:
1. VIN-MatchingWe match the donor VIN to your VIN to confirm engine code, emissions calibration, and drivetrain fit.
2. Tested & VerifiedASE-certified technicians compression-test every cylinder and run a leak-down evaluation on each engine.
3. Noise & Smoke VerificationUnits are run to verify normal mechanical sound and clean operation — catches wear static tests miss.
4. Visual InspectionEvery accessible component is inspected: turbos, manifolds, valve covers, accessories, sensor harnesses.
5. Photograph & CatalogMulti-angle photos sent to you BEFORE we ship, for your approval.
6. Palletize & ShipStrapped on a heavy-duty wooden pallet, shipped via freight at no charge.
What Our Customers Say
Rated Excellent by our customers on Trustpilot.
★★★★★
Transaction was perfect
"Found me the right engine at a great price. Got it in 2 days and installed the truck the next day. Runs absolutely beautiful."
— Kevin Graham, 2026-04-29
★★★★★
Repeat customer
"AutoPowerSource is a great company. I've used them several times for used motors. Low mileage when other companies gave up."
— Curtis Haines, 2025-12-23
★★★★★
Highly recommend Mike
"Mike reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful."
— Beatrice, 2026-03-31
★★★★★
Great experience
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she found a different one quickly."
— Bryan Perkins, 2026-03-25
Our Photos-Before-Shipment Guarantee
Before any 2020 GMC engine leaves our warehouse, we send you multi-angle photographs. You approve. If you do not approve, you get every dollar back — no questions, no restocking fees, no return freight charges. On top of 30-day money-back and up to a 3-year warranty.
✉ Email Us at info@autopowersource.com
