2012 MASERATI GRANTURISMO

Typical onset: 40,000-80,000 mi

Symptoms: Blue smoke on startup or deceleration, Excessive oil consumption (1+ quart per 1,000 miles), Misfires and rough idle as guides worsen, Sudden loss of power when valve drops into cylinder destroying pistons, rings, and sometimes crankshaft

Fix: Early intervention requires head removal, new guides, valve job, timing chain components while you're in there—18-24 hours labor. If you waited too long and dropped a valve, you're looking at short block or complete engine rebuild with all pistons, rings, bearings, crank inspection/machining—60-80 hours. Many owners opt for used engines at this point.

Estimated cost: $8,000-15,000 for heads only, $25,000-45,000 for full rebuild or replacement

Typical onset: 50,000-90,000 mi

Symptoms: Transmission slipping or flaring between shifts, Metal debris in trans fluid at service, Sudden loss of all gears—internal cooler disintegrates and circulates metal shavings throughout valve body and clutch packs

Fix: The ZF 6HP26 has an internal oil cooler that fails and contaminates the entire transmission. Requires complete transmission rebuild with new valve body, solenoids, clutches, and cooler replacement—25-30 hours. Some shops won't rebuild these after cooler failure and recommend replacement trans.

Estimated cost: $8,000-14,000 rebuilt, $12,000-18,000 with replacement unit

Typical onset: 60,000-100,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive driveline vibration at idle in gear, Visible sag or cracking of rubber mount, Harsh engagement into gear

Fix: The rear transmission mount deteriorates from heat and age. Replacement requires dropping the exhaust and supporting the transmission—4-6 hours labor. Often done alongside the side mounts for longevity.

Estimated cost: $800-1,500

Symptoms: Hard starting after sitting, Stumbling or hesitation under acceleration, Limp mode with fuel pressure codes, Rough running that progressively worsens

Fix: The in-tank fuel filter clogs from sediment and varnish, especially if the car sits. Filter is integrated with the pump assembly requiring tank drop—6-8 hours. If pump is also failing or contaminated, replace the entire assembly while you're there.

Estimated cost: $1,200-2,200

Typical onset: 70,000-110,000 mi

Symptoms: Harsh or delayed shifts, especially 2-3 or 3-4, Transmission fault light with solenoid codes, Stuck in one gear or failsafe mode, Erratic shift points

Fix: ZF solenoids fail from heat cycling and contaminated fluid. Requires pan removal, valve body access, and solenoid replacement—8-12 hours. If caught early before cooler failure this is manageable, but if there's already been internal damage you're rebuilding anyway.

Estimated cost: $2,000-3,500

Typical onset: 50,000+ mi

Symptoms: TPMS warning light stays on, Intermittent loss of reading from one or more wheels, False warnings after temperature changes, System won't relearn after tire rotation or replacement

Fix: Batteries die in sensors around 7-10 years, and the system can be finicky with relearning. Sensors run $80-120 each, replacement is 0.5 hours per wheel. Sometimes requires dealer scan tool to properly initialize.

Estimated cost: $300-600 for all four sensors