The 2016 DB9's naturally-aspirated 6.0L V12 is charismatic but fragile under stress. Transmission cooling, engine bearing failures, and the automated-manual gearbox's complexity define ownership costs beyond the exotic badge.
Connecting Rod and Main Bearing Failure
Occasional · high severityTypical onset: 40,000-80,000 mi
Symptoms: Metallic knocking or ticking from lower engine, especially cold start, Oil pressure warning light or low readings at idle, Metal shavings in oil during changes, Sudden catastrophic failure with loss of power
Fix: Engine-out rebuild or short-block replacement required. 50-70 hours labor depending on whether heads need work. Bearings alone won't save you—machine work and full tear-down mandatory. Many shops won't touch it; expect Aston dealer or V12 specialist rates.
Estimated cost: $18,000-35,000
Touchtronic II/III Transmission Oil Cooler Leaks
Common · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Transmission fluid pooling under car, forward of rear axle, Harsh or delayed shifts when fluid runs low, Burnt smell from transmission area during spirited driving, Check engine light with transmission temp codes
Fix: Cooler lines corrode where they connect to the transmission-mounted heat exchanger. Replace cooler, lines, and fluid. 6-9 hours labor; access requires lift and sometimes exhaust removal. Ignore it and you'll cook the clutch packs.
Estimated cost: $2,200-3,800
Transmission Control Module (TCM) Software Glitches and Hardware Failure
Occasional · high severitySymptoms: Transmission stuck in one gear, no shifting, Erratic or random neutral engagement while driving, Paddle shifters unresponsive or delayed, Limp mode with transmission fault codes, Recalls issued for TCM programming issues
Fix: NHTSA recall addresses some software faults—check if applied. Hardware failures require TCM replacement and reprogramming at dealer or specialist with Aston tooling. 3-5 hours labor, but module itself is $2,500-4,000 new. Used modules need VIN-specific coding.
Estimated cost: $3,500-6,000
Transmission and Differential Mounts Deterioration
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking on shifts or throttle lift, especially in manual mode, Vibration through center tunnel at highway speed, Excessive driveline lash when reversing direction, Visible sagging or torn rubber on mounts
Fix: Rubber mounts fatigue from V12 torque and heat. Transaxle setup means rear diff and trans share mounts. Replace all at once—4-6 hours labor. OEM parts only; aftermarket options are poor quality and won't last.
Estimated cost: $1,800-2,800
Fuel System Clogging and Filter Neglect
Occasional · medium severityTypical onset: 40,000-70,000 mi
Symptoms: Rough idle, stumbling, or hesitation under load, Check engine light with fuel trim or misfire codes, Hard starting after sitting overnight, Loss of top-end power above 5,000 RPM
Fix: In-tank fuel filter and pump assembly require tank drop. 8-12 hours labor due to exotic underbody panels and exhaust routing. Ethanol fuel accelerates sediment buildup. Replace filter, inspect pump, and clean tank if contaminated. Don't wait for limp mode—V12 injectors are $400 each if they clog.
Estimated cost: $2,500-4,200
Head Gasket Weeping and Coolant Leaks
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Sweet coolant smell from engine bay, especially after shutdown, Slow coolant loss with no visible external leaks, White residue on valley cover or between cylinder banks, Slight rough idle or misfire when cold
Fix: V12 head gaskets leak externally more often than internally. Both heads off, resurface if warped, new gaskets and timing chains while you're in there. 60-80 hours labor at specialist rates. Budget ballooned by ancillary work—waterpump, hoses, spark plugs, coils. If it's weeping but not overheating, you can nurse it for a while.
Estimated cost: $15,000-25,000
Buy only if you have a $10,000+ annual repair fund and access to a trusted V12 specialist—this is a six-figure car with six-figure problems lurking under every service interval.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.