The 2012 Tesla Roadster is essentially a Lotus Elise chassis with Tesla's first-generation electric powertrain—a brilliant proof-of-concept that's now showing its age with expensive drive unit failures, high-voltage battery degradation, and obsolete parts support from a manufacturer that's moved on.
Power Electronics Module (PEM) / Inverter Failure
Common · high severityTypical onset: 40,000-80,000 mi
Symptoms: Complete loss of drive power with warning lights, Intermittent power cuts or limp mode, Cooling system faults related to inverter overheating, High-pitched whine from inverter during acceleration
Fix: PEM replacement requires disconnecting HV battery, draining coolant, removing entire power electronics assembly. Tesla parts availability is spotty—many owners resort to third-party rebuilds. 8-12 hours labor if parts are on hand, but sourcing can take weeks or months.
Estimated cost: $8,000-15,000
Single-Speed BorgWarner Transmission Whine and Bearing Failure
Common · medium severityTypical onset: 30,000-70,000 mi
Symptoms: High-pitched whining noise that increases with speed, Grinding or clicking from transmission area, Vibration through chassis at highway speeds, Complete loss of drive in severe cases
Fix: Early production units had weak differential bearings and gear mesh issues. Transmission removal requires lifting powertrain from beneath—tight quarters in Lotus chassis. Rebuild with upgraded bearings is 12-16 hours; some units need complete replacement if gears are damaged.
Estimated cost: $4,500-9,000
High-Voltage Battery Pack Degradation and Brick Risk
Occasional · high severitySymptoms: Range dropping below 120 miles on full charge (original ~240 mi), Battery won't charge above 80% state of charge, Complete battery failure if left discharged ('bricking')—permanent damage, Individual cell voltage imbalances shown in diagnostic mode
Fix: Tesla used 6,831 18650 lithium-ion cells. If pack 'bricks' from deep discharge, it's often unrecoverable. Some specialists can replace individual modules, but most need full pack replacement. This is 20+ hours of labor and Tesla no longer manufactures these packs—third-party rebuilds or salvage units only.
Estimated cost: $25,000-40,000
Electric Drive Motor Bearing and Rotor Issues
Occasional · high severityTypical onset: 60,000-100,000 mi
Symptoms: Grinding or rumbling noise from motor during acceleration, Excessive vibration at all speeds, Reduced power output and acceleration, Error codes indicating motor position sensor faults
Fix: AC induction motor can develop bearing wear or rotor bar damage. Motor removal requires dropping entire drive unit from chassis—similar labor to transmission work but motor itself may need specialized rebuild shop. 14-18 hours plus motor rebuild turnaround time of weeks.
Estimated cost: $7,000-12,000
12-Volt Battery System Failures Causing HV Lockout
Common · medium severitySymptoms: Car completely dead—won't unlock or power on, Intermittent starting issues despite charged main battery, Warning lights for multiple systems simultaneously, DC-DC converter faults preventing 12V charging from HV pack
Fix: The 12V system powers contactors that enable the HV battery—when it fails, car is bricked temporarily. DC-DC converter replacement is 4-6 hours behind various body panels. Standard 12V battery replacement is straightforward but needs doing every 3-4 years religiously to prevent lockout.
Estimated cost: $1,200-3,000
Lotus Chassis Electrical Gremlins and Body Control Issues
Occasional · low severitySymptoms: Intermittent gauge cluster failures, Door locks operating erratically, HVAC blower motor running constantly or not at all, Water intrusion causing short circuits in footwells
Fix: Underlying Lotus wiring wasn't designed for the added complexity of Tesla's systems. Water leaks through clamshell and door seals are common. Diagnosis is time-consuming—expect 2-4 hours just to trace faults. Fixes range from seal replacement to rewiring corroded connections.
Estimated cost: $500-2,500
Touchscreen / VDS Display and Infotainment Failures
Occasional · low severitySymptoms: Center touchscreen black or unresponsive, Display shows garbage graphics or scrambled text, No access to charging settings or vehicle configuration, Complete loss of backup camera functionality
Fix: The Vehicle Display System uses dated hardware that fails with age and heat cycling. Tesla no longer supports these units—repair requires third-party specialists or used replacements. Replacement is 2-3 hours but sourcing working units is the real challenge.
Estimated cost: $1,500-3,500
Only buy if you're comfortable with six-figure exotic car ownership costs and the reality that you're preserving an orphaned technology with diminishing parts support—spectacular to drive, terrifying to depend on.
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.