Engine Will Not Crank - Crankshaft Will Not Rotate

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. 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. Inspect for cracked cylinder wall.
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 Cracked cylinder wall	Inspect cylinder for damaged components and/or foreign materials. Inspect for fallen cylinder wall. Repair or replace as required.
Seized crankshaft or connecting rod bearings	Inspect crankshaft and connecting rod bearings. Inspect for fallen cylinder wall. Repair as required.
Bent or broken connecting rod	Inspect connecting rods. Repair as required.
Broken crankshaft	Inspect crankshaft. Repair as required.