The 2015 RC 300 (actually badged RC 350 with the 3.5L V6 in most markets) shares the robust 2GR-FSE engine and 8-speed transmission with the GS/IS platforms. Generally reliable, but the direct-injection V6 has known carbon buildup issues and the 8-speed can develop fluid cooler leaks.
Carbon Buildup on Intake Valves (Direct Injection)
Common · medium severityTypical onset: 60,000-90,000 mi
Symptoms: rough idle, especially cold start, misfires on startup, loss of power under load, increased fuel consumption
Fix: Walnut blasting intake ports with manifold removed. 6-8 labor hours for proper cleaning, includes new intake gaskets and throttle body service.
Estimated cost: $800-1,400
Transmission Oil Cooler Line Leaks
Occasional · high severityTypical onset: 70,000-120,000 mi
Symptoms: transmission fluid dripping near radiator, low fluid level warnings, burnt transmission fluid smell, harsh or delayed shifts when fluid is low
Fix: Replace failed cooler lines and/or external cooler assembly. Often the crimped fittings corrode. 3-4 hours labor, includes fluid flush.
Estimated cost: $600-1,200
Water Pump Failure
Occasional · high severityTypical onset: 80,000-130,000 mi
Symptoms: coolant leak from front of engine, whining or grinding noise from accessory belt area, overheating, coolant level drops repeatedly
Fix: Replace water pump, serpentine belt, and thermostat while in there. 4-5 hours labor on the transverse V6 with tight engine bay.
Estimated cost: $700-1,100
Front Lower Control Arm Bushing Wear
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: clunking over bumps, steering wander or vague feel, uneven tire wear on inside edges, vibration during braking
Fix: Replace front lower control arms (bushings not sold separately on this platform). 2.5-3 hours labor plus alignment.
Estimated cost: $800-1,300
VVT-i Solenoid Oil Line Leaks
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: oil seepage on valve covers, Check Engine Light with P0010/P0020 codes, rough idle or hesitation, oil consumption between changes
Fix: Replace VVT-i oil control valve gaskets and cam cap seals. 3-4 hours labor, requires partial valve cover removal and careful torque procedure.
Estimated cost: $500-900
Starter Motor Failure
Rare · high severityTypical onset: 100,000-150,000 mi
Symptoms: single click when turning key, no crank, intermittent no-start in hot weather, grinding noise during cranking, starter engages but spins slowly
Fix: Replace starter motor. Awkward access on the V6 transverse setup, requires removal of intake components. 2.5-3 hours labor.
Estimated cost: $600-1,000
Solid luxury coupe if maintained properly; budget for carbon cleaning and watch the transmission cooler, but otherwise the 2GR-FSE is a known-reliable workhorse.
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.