2.0L DOHC SIDI Engine Long Block for 2020-2025 Cadillac CT4, CT5

A quick look at your own vehicle makes sure the right engine shows up:

• Confirm the 8th digit of the VIN is 'K' to verify the vehicle has the 2.0L LSY engine.
• Confirm the vehicle is All-Wheel Drive (AWD) to ensure a direct fit without needing an upper oil pan swap.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• EN-52462-A Camshaft Alignment/Locking Tool
• EN-52476 Flywheel Locking Tool
• EN-52461 Cam Phaser Torque Reaction Tool
• EN-52441 / EN-52442 Balance Shaft Timing and Holding Tools
• Engine Hoist/Lift
• GM-specific Scan Tool (MDI 2 with GDS2 software)
• Torque-Angle Gauge
• Harmonic Balancer Puller/Installer Kit
• Timing Cover & Rear Main Seal Alignment Tools
• Fuel Line Disconnect Tools

Budget for these consumables at install:

• 5.3 quarts (5.0 liters) of SAE 0W-20 Full Synthetic oil meeting GM dexos1 Gen 3 (or Gen 2) specification
• ACDelco PF66 oil filter (or high-quality equivalent)
• GM-approved orange Dex-Cool coolant (50/50 pre-diluted)
• New OEM iridium spark plugs
• Exhaust manifold gasket
• Intake manifold gasket
• Turbocharger mounting gaskets, oil feed/drain line gaskets, and coolant line O-rings
• Upper and lower oil pan gaskets/sealant (if swapping the upper oil pan extension)
• New torque-to-yield (TTY) crankshaft balancer bolt
• New TTY flywheel/flexplate bolts
• New turbocharger mounting hardware
• New accessory drive/serpentine belt

What your vehicle’s computers will need after the swap:

What’s involved: Crankshaft Position (CKP) System Variation Relearn, Immobilizer/Security Re-marriage (VTD Relearn if ECM is swapped), ECM Programming

While the original ECU can be reused without a full re-marriage, a Crankshaft Position (CKP) System Variation Relearn is mandatory using a GM-specific scan tool (GDS2/MDI) to prevent rough running and false misfire codes. If the ECM is swapped, an Immobilizer/Security Re-marriage (VTD Relearn) and ECM programming are also required.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• The 'F Extension' (Upper Oil Pan) AWD vs. RWD Trap: If installing in a RWD vehicle, you must swap the upper oil pan extension which houses the dual balance shafts. You must time the balance shafts to the crankshaft using special tools EN-52441 and EN-52442 to avoid destructive engine vibrations.
• The Cam Carrier Design: The LSY engine uses a structural cam carrier instead of a traditional valve cover. Loosening the top cover bolts will cause the camshafts to lift out, disrupting engine timing. Do not touch without camshaft locking tools.
• Turbocharger Wastegate Binding (DTC P2B81): Inspect the transferred turbocharger's wastegate linkage for smooth operation before installation to avoid transferring a binding wastegate issue.
• Fragile Turbo Oil Feed Line: Always replace the turbocharger oil feed line to prevent carbon clog oil starvation which can destroy the turbocharger within seconds.
• Front/Rear Cover Alignment: The front timing cover and rear main seal cover lack alignment dowels and must be centered using special alignment tools to prevent immediate oil leaks.

Easy to get right once you know them:

• Assuming AWD and RWD engines are plug-and-play without realizing the upper oil pan extension must be swapped for RWD applications.
• Failing to prelube the engine before the first start, which can cause immediate, irreversible bearing damage.
• Reusing single-use torque-to-yield (TTY) bolts (such as crankshaft balancer or flywheel bolts), leading to loose components.
• Blaming the engine for misfires (DTC P0300 / P0315) before performing the mandatory Crankshaft Position System Variation Relearn.
• Ignoring the 'LESS TURBO' note and expecting a turbocharger to be included with the assembly.

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: