2007 CHEVROLET MALIBU

Typical onset: 80,000-140,000 mi

Symptoms: Harsh or delayed 2-3 shift, especially when cold, Check Engine light with P0521 or P0741 codes, Transmission fluid leaking from cooler lines at radiator, Slipping or no movement in 2nd or 3rd gear

Fix: Replace pressure control solenoid (3-4 hours labor inside pan) or full transmission overhaul if clutches burnt. Cooler lines rust through at crimp fittings near radiator — replace both lines preemptively during any trans service. Many shops quote full rebuild once slipping starts.

Estimated cost: $400-900 solenoid only; $2,200-3,500 rebuild

Typical onset: 70,000-110,000 mi

Symptoms: Intermittent or complete loss of power assist, especially in cold weather, Service Stabilitrak and Service Power Steering warnings simultaneously, Steering becomes extremely heavy at low speeds, Grinding or clicking noise from steering column when turning

Fix: EPS motor or control module on the column fails, often moisture-related. Column must be removed for motor replacement (3-4 hours). GM issued recalls for some VINs but not all affected units were covered. Used parts fail quickly; OEM or quality reman required.

Estimated cost: $900-1,600

Typical onset: 100,000-150,000 mi

Symptoms: Excessive oil consumption (1 qt per 1,000 mi or worse), Rough cold starts, blue smoke on startup, Rattling from timing chain on cold start for 2-3 seconds, Loss of compression, fouled plugs on cylinders 2 and 3

Fix: Piston ring land cracks or carbon buildup causes consumption; if ignored, timing chain stretches and can jump. Many engines need full rebuild or short block replacement (15-20 hours labor). Preventive: oil changes every 3,000-4,000 mi with quality synthetic and catch early consumption.

Estimated cost: $3,500-5,500 short block; $1,200-1,800 timing chain only if caught early

Typical onset: 90,000-130,000 mi

Symptoms: No start or intermittent stalling when fuel tank below 1/4, Whining or buzzing noise from rear seat area, Loss of power under acceleration, hesitation, Check Engine light with P0087 (fuel rail pressure low)

Fix: In-tank pump assembly fails, often stranding vehicle. Tank must be dropped (2-3 hours labor). GM recall covered some units for wiring but not mechanical pump failure. Use AC Delco or Delphi replacement; aftermarket pumps fail within a year.

Estimated cost: $600-950

Typical onset: 60,000-100,000 mi

Symptoms: Clunk or thud on acceleration or deceleration, Excessive engine movement visible when shifting into gear, Vibration through steering wheel or floor at idle in Drive, Harsh engagement into Reverse

Fix: Upper transmission mount (torque strut) tears or collapses, allowing drivetrain to rock. Replace mount (1-1.5 hours labor). Often ignored until it causes secondary damage to exhaust hangers or transmission cooler lines. Check all three engine mounts at same time; if original, replace as set.

Estimated cost: $200-350 per mount

Symptoms: Key won't turn in ignition or sticks in ACC position, Security light flashing, no crank, 10-minute wait before retry, Intermittent no-start after hitting bumps or in cold weather, Passlock sensor triggers theft deterrent randomly

Fix: Ignition lock cylinder wears and binds or Passlock sensor in column fails. Cylinder replacement is 1-2 hours but requires programming. Passlock bypass resistor trick works for sensor faults but voids theft warranty. Many owners carry spare programmed key and spray lock cylinder with graphite regularly.

Estimated cost: $250-500 lock cylinder; $150-300 Passlock sensor

Typical onset: 50,000-90,000 mi

Symptoms: Clunk or pop felt through steering wheel when turning at low speeds or over bumps, Noise worse in cold or damp weather, No loss of steering control, purely noise and feel

Fix: Intermediate shaft joint wears and loses grease. GM released revised shaft with better seal. Replace shaft (1.5-2 hours labor). Some owners attempt to regrease joint but it returns within months. Not a safety issue but annoying.

Estimated cost: $300-500