2009 BUICK LACROSSE

Typical onset: 80,000-130,000 mi

Symptoms: Cold-start rattle for 2-3 seconds, Check engine light with cam/crank correlation codes (P0011, P0021), Rough idle or stalling, Reduced power and fuel economy

Fix: Requires front-end teardown to replace timing chains, guides, tensioners, and VVT solenoids. This is a 12-15 hour job at minimum. If neglected, jumped timing destroys valves and pistons, requiring complete engine rebuild or replacement.

Estimated cost: $2,800-4,500

Typical onset: 60,000-100,000 mi

Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), Blue smoke on startup or acceleration, Fouled spark plugs, Carbon buildup causing misfires

Fix: GM's early 3.6L VVT has poorly designed low-tension piston rings that wear prematurely. Fix requires engine removal, full teardown, new pistons and rings, honing, often new valve seals. 25-30 hour job. Many shops recommend used/reman engine swap instead at this mileage.

Estimated cost: $4,500-7,000

Typical onset: 70,000-120,000 mi

Symptoms: Transmission slipping or harsh shifting, Milky or discolored transmission fluid, Coolant in transmission pan or transmission fluid in coolant reservoir, Transmission overheating

Fix: The internal transmission cooler in the radiator fails, allowing coolant and ATF to mix. Requires radiator replacement, complete transmission flush (often multiple flushes), new cooler lines. If driven after contamination, transmission rebuild is necessary. Cooler line replacement alone is 2-3 hours; full contamination repair with trans flush is 5-8 hours. Transmission rebuild adds 15-20 hours.

Estimated cost: $800-1,200 (cooler only); $3,500-5,500 (with transmission damage)

Symptoms: Key won't turn in ignition, Security light stays on, no-start condition, Intermittent no-start requiring 10-minute wait, Key stuck in ignition

Fix: GM's Passlock system has notoriously unreliable lock cylinder sensors and wiring. Ignition lock cylinder replacement is 1.5-2 hours (column disassembly required). Passlock relearn procedure required. Some technicians bypass the system entirely when cylinder is functional but sensor fails.

Estimated cost: $350-650

Typical onset: 90,000-150,000 mi

Symptoms: Heavy clunk when shifting from Park to Drive/Reverse, Excessive vibration at idle in gear, Transmission appears to 'drop' or shift position during acceleration, Visible sagging of transmission when inspected on lift

Fix: Fluid-filled transmission mounts fail, allowing excessive drivetrain movement. Front and rear mounts typically fail together. Replacement requires supporting transmission, 3-4 hours labor for both mounts.

Estimated cost: $450-750

Symptoms: One or both low beams not working, Melted connector at headlight bulb, Burning smell from headlight assembly, High beams work but low beams don't

Fix: Inadequate wiring gauge for halogen bulb draw causes connector melt-down. Requires headlight harness replacement (not just bulb). NHTSA recall covered some but not all affected vehicles. Repair is 1-2 hours per side, requires proper crimp connectors and heat-shrink, not butt connectors.

Estimated cost: $200-400

Typical onset: 100,000-140,000 mi

Symptoms: Whining or groaning noise when turning, Hard steering effort, especially when cold, Power steering fluid leak from pump, Squealing from serpentine belt area

Fix: Power steering pump develops internal wear or seal failure. Replacement is straightforward but requires serpentine belt removal and fluid flush. 2-3 hours labor.

Estimated cost: $400-650