Engine Will Not Crank - Crankshaft Will Not Rotate

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
Seized accessory drive system component	Remove accessory drive belts. Rotate crankshaft by hand at the balancer or flywheel location.
Hydraulically locked cylinder Coolant/antifreeze in cylinder Oil in cylinder Fuel in cylinder	Remove spark plugs and check for fluid. Inspect for broken head gasket. Inspect for cracked engine block or cylinder head. Inspect for a sticking fuel injector.
Seized automatic transmission torque converter	Remove the torque converter bolts. Rotate crankshaft by hand at the balancer or flywheel location.
Seized manual transmission	Disengage the clutch. Rotate crankshaft by hand at the balancer or flywheel location.
Broken timing chain and/or gears	Inspect timing chain and gears. Repair as required.
Seized balance shaft	Inspect balance shaft. Repair as required.
Material in cylinder Broken valve Piston material Foreign material	Inspect cylinder for damaged components and/or foreign materials. Repair or replace as required.
Seized crankshaft or connecting rod bearings	Inspect crankshaft and connecting rod bearings. Repair as required.
Bent or broken connecting rod	Inspect connecting rods. Repair as required.
Broken crankshaft	Inspect crankshaft. Repair as required.