Engine Will Not Crank - Crankshaft Will Not Rotate

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
Seized accessory drive system component	Remove the accessory drive belts. Confirm that the engine will rotate. Rotate the crankshaft by hand at the crankshaft balancer or flywheel location. Repair or replace the components as required.
Seized automatic transmission torque converter	Remove the torque converter-to-flywheel bolts. Confirm that the engine will rotate. Rotate the crankshaft by hand at the crankshaft balancer or flywheel location. Repair or replace the components as required.
Seized manual transmission	Disengage the clutch by depressing the clutch pedal. Confirm that the engine will rotate. Rotate the crankshaft by hand at the crankshaft balancer or flywheel location. Refer to Manual Transmission in the Transmission/Transaxle/Transfer Case Unit Repair Manual.
Broken timing chain	Inspect the timing chain and gears. Repair or replace the components as required.
Seized timing chain or timing gears	Inspect the timing chain and gears for foreign material or a seized chain. Repair or replace the components as required.
Seized or broken camshaft	Inspect the camshaft and the camshaft bearings. Repair or replace the components as required.
Bent valve in the cylinder head	Inspect the valves and the cylinder heads. Repair or replace the components as required.
Seized oil pump	Inspect the oil pump assembly. Repair or replace as required.
Hydraulically locked cylinder Coolant/antifreeze in the cylinder Oil in the cylinder Fuel in the cylinder	Remove spark plugs and check for fluid in the cylinder. When rotating the engine with the spark plugs removed, the piston, on compression stroke, will push fluid from the combustion chamber. Inspect for failed/broken head gaskets. Inspect for a cracked engine block or cylinder head. Inspect for a sticking fuel injector. Repair or replace the components as required.
Material in the cylinder Broken valve Broken piston rings Piston material Foreign material	Inspect the cylinder for damaged components and/or foreign materials. Repair or replace the components as required.
Seized crankshaft or connecting rod bearings	Inspect crankshaft and connecting rod bearings. Repair or replace the components as required.
Bent or broken connecting rod	Inspect the connecting rods. Replace the piston, pin and connecting rod as an assembly, as required.
Broken crankshaft	Inspect the crankshaft. Repair or replace the components as required.