Engine Complete Assembly for 2015-2016 Chevrolet & GMC • Canyon, Colorado

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

• Verify the 8th digit of the VIN is '3' to confirm original LFX equipment.
• Confirm drivetrain configuration (4x2 vs 4x4) to prepare for oil pan/bracket transfer if 4x4.
• Check the RPO code on the Service Parts Identification label (glove box lid) for 'LFX'.
• Verify the model year is 2015 or 2016 (2017+ models use the non-interchangeable LGZ engine).

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

Special tools this job needs:

• Engine hoist/crane with heavy-duty load leveler
• GM Timing Chain Holding Tools (EN-48383 or EN-46105)
• High-pressure fuel line quick-disconnect tool
• Professional-grade OBD2 scan tool with Crankshaft Position System Variation Learn capability
• Engine stand
• Comprehensive metric socket and wrench set
• Torque wrenches

Budget for these consumables at install:

• Fresh synthetic 5W-30 engine oil meeting GM Dexos1 specifications (approx. 6 quarts)
• Premium cartridge-style oil filter (ACDelco PF2129G or equivalent)
• Fresh GM-approved Dex-Cool coolant (50/50 pre-diluted or mixed with distilled water)
• Pre-gapped iridium spark plugs
• Upper and lower intake manifold plenum gaskets
• Thermostat and housing assembly / gasket
• Front and rear crankshaft main seals (highly recommended)
• Oil pan gasket (mandatory if transferring pan for 4x4 application)
• New accessory drive / serpentine belt
• Throttle body gasket
• Exhaust flange gaskets

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

What’s involved: Crankshaft Position (CKP) System Variation Learn

Whenever the engine is replaced, a Crankshaft Position System Variation Learn must be performed to calibrate the relationship between the crankshaft position sensor and the reluctor ring. Skipping this will trigger a persistent check engine light (DTC P0315), false misfire codes, or cause the engine to run in a reduced power mode. Requires a dealer-level scan tool (such as GM GDS2) or a high-end professional diagnostic scanner.

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

• Crankshaft Position (CKP) Relearn must not be skipped to ensure accurate misfire detection.
• Integrated exhaust manifold bolts are highly prone to rusting and snapping off inside the aluminum cylinder head; apply penetrating oil hours before removal.
• The direct-injection system operates at up to 2,000+ PSI; safely relieve pressure before disconnecting. The high-pressure fuel crossover pipe is a one-time-use crush-seal component and must be replaced.
• The harmonic balancer bolt and flywheel/flexplate bolts are torque-to-yield (TTY) and cannot be reused; new OEM bolts must be purchased.
• The A/C compressor slides onto a long mounting rod anchored to the block; the entire compressor support bracket must be unbolted from the block as a single assembly to remove it from the tight engine bay.
• The composite intake manifold can be brittle on higher-mileage engines; use care during removal and installation to avoid cracking, especially with hard-to-access rear bolts.

Easy to get right once you know them:

• Reusing the high-pressure fuel pipe, which uses a single-use crush flare to seal; reusing it presents an extreme engine bay fire hazard due to high-pressure fuel spray.
• Skipping the thermostat replacement during the swap; replacing it later while the engine is in the truck is a highly frustrating 3-to-4-hour job due to tight firewall clearance.
• Neglecting the Crankshaft Position Relearn, which prevents the ECU from detecting actual engine misfires and can lead to catalytic converter damage.
• Using cheap, non-Dexos-approved oil or extending oil change intervals beyond 5,000 miles, which rapidly accelerates timing chain guide wear.
• Ignoring the VIN code and ordering based on year/model alone, resulting in receiving an incompatible FWD engine configuration.
• Not checking and filling the oil level immediately before the first start after shipping.

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: