2000 PONTIAC GRAND AM

Typical onset: 60,000-100,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Coolant in oil (milky dipstick), Overheating, Rough idle when warm

Fix: Replace both upper and lower intake gaskets, requires 5-7 hours labor. Must remove fuel rail, throttle body, and clean mating surfaces thoroughly. Dex-Cool often turns to sludge and destroys these plastic gaskets. Always flush cooling system and replace thermostat during repair.

Estimated cost: $600-1,200

Typical onset: 80,000-140,000 mi

Symptoms: Delayed or harsh 1-2 shift, Slipping between gears, Whining noise in reverse, No reverse or intermittent reverse, Check Engine light with shift solenoid codes

Fix: Common failures include 2-4 band, pressure control solenoid, and torque converter. Rebuilds take 8-12 hours, but many techs recommend replacement with remanufactured unit due to poor rebuild longevity on this platform. Fluid should be changed every 50k but rarely is.

Estimated cost: $1,800-3,200

Typical onset: 90,000-150,000 mi

Symptoms: Excessive oil consumption (1 qt per 500-1000 miles), Rod knock on cold start, Metal shavings in oil, Low oil pressure warning, Catastrophic failure without warning

Fix: The 2.4L Twin Cam suffers piston ring land failure and bearing wear. Oil sludge exacerbates problems. Once rod knock starts, it's 16-20 hours for short block replacement or used engine swap. Prevention requires religious 3,000-mile oil changes with quality synthetic.

Estimated cost: $2,500-4,500

Symptoms: Key won't turn or gets stuck, Must wiggle steering wheel to turn key, Key can be removed while running, Passlock security light on, no-start condition

Fix: GM's Passlock system and worn tumblers cause this. Lock cylinder replacement takes 1-2 hours, requires disabling airbag and steering wheel removal. Must reprogram or bypass Passlock to avoid 10-minute relearn cycle. Sometimes just the switch fails, not the cylinder itself.

Estimated cost: $200-450

Typical onset: 70,000-120,000 mi

Symptoms: Clunking over bumps, Steering wander, Tire wear on inside edge, Grease boot torn or missing, Visible play when prying on wheel

Fix: Lower control arms not serviceable separately—must replace entire arm assembly per side. 2-3 hours labor for both sides. Alignment mandatory after replacement. These fail suddenly and can cause wheel collapse, especially in rust belt states. Inspect annually after 60k.

Estimated cost: $400-700

Symptoms: Engine cranks but won't start, Security light stays on, Starts after waiting 10 minutes, Intermittent problem, worse in cold weather, No warning before failure

Fix: Passlock sensor in ignition cylinder sends false tampering signal. Temporary fix is the 10-minute relearn. Permanent solutions: replace ignition switch/sensor (1.5 hours) or install bypass module (1 hour). Many techs install bypass to eliminate problem permanently rather than chase intermittent sensor.

Estimated cost: $150-400

Typical onset: 80,000-130,000 mi

Symptoms: Engine overheats at idle or in traffic, Fans never run or run constantly, A/C blows warm at stops, No high-speed fan operation, Melted relay connector

Fix: Cooling fan control module (behind passenger headlight) and relays fail frequently. Module replacement takes 1-2 hours. Relays are cheap but connectors melt from high current draw. Sometimes requires pigtail connector repair. Test fans directly before replacing expensive module.

Estimated cost: $150-450