The 2022 Santa Fe PHEV shares Hyundai's troubled 1.6L turbo Smartstream engine paired with a 6-speed automatic and electric drive system. The engine internals are a serious reliability concern, with catastrophic failures documented even under warranty mileage.
Catastrophic 1.6L Turbo Engine Failure (Rod Knock / Bearing Failure)
Occasional · high severityTypical onset: 30,000-80,000 mi
Symptoms: Sudden metallic knocking from engine bay, Loss of oil pressure warning, Engine seizure or failure to start, Metal shavings in oil during routine changes
Fix: Complete engine replacement or short block rebuild required. Hyundai has extended warranty coverage on many units, but out-of-warranty cases require 18-24 labor hours for R&R plus machine work or reman engine. Rod bearings and piston failures are the culprits—metal debris circulates and destroys the bottom end.
Estimated cost: $8,000-12,000
Transmission Oil Cooler Lines Leaking
Common · medium severityTypical onset: 40,000-70,000 mi
Symptoms: Red ATF pooling under vehicle, Transmission overheating warnings on dash, Burnt smell near front of vehicle, Low transmission fluid level on dipstick
Fix: Replace transmission cooler lines and fittings where they connect to radiator assembly. Common failure point is the quick-connect fittings cracking from heat cycling. 2-3 hours labor, drain and refill ATF.
Estimated cost: $400-700
Rear Camera System Intermittent Failure
Common · low severitySymptoms: Black screen when shifting to reverse, Distorted or flickering rear camera image, Blue screen with 'camera unavailable' message, Works intermittently after car sits overnight
Fix: NHTSA recall 23V-353 addresses camera module failures. Dealer replaces rear camera assembly under recall. Some cases require harness inspection for water intrusion at tailgate grommet. 1.5 hours labor if out-of-pocket.
Estimated cost: $300-500
Transmission Mount Collapse
Occasional · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Clunking when shifting from Park to Drive, Excessive vibration at idle in Drive, Visible sagging of transmission bellhousing, Harsh engagement into gear
Fix: Replace forward transmission mount. The PHEV's extra weight and torque from electric motor accelerates mount failure. Requires lifting powertrain slightly for access. 2.5-3 hours labor.
Estimated cost: $350-600
Fuel Tank Pressure Sensor / Evaporative System Fault
Occasional · low severityTypical onset: 20,000-60,000 mi
Symptoms: Check engine light with P0455 or P0442 codes, Fuel cap warning message, Failed emissions test, Difficulty fueling—pump clicks off repeatedly
Fix: NHTSA recall 22V-855 covers fuel tank assembly replacement for EVAP system issues. Some units have tank pressure sensor failures outside recall scope requiring sensor replacement at filler neck. 1.5 hours labor for sensor, 4-6 hours if full tank replacement needed.
Estimated cost: $250-450
High-Voltage Battery Cooling System Leaks
Rare · high severityTypical onset: 40,000-80,000 mi
Symptoms: Hybrid system warning light, Reduced electric-only range, Coolant level dropping with no visible external leaks, Sweet smell in cabin or cargo area
Fix: The PHEV battery pack has dedicated coolant loop. Leaks occur at quick-disconnect fittings or internal cooling plate seals. Requires HV battery isolation and partial disassembly. Specialized training and equipment needed—dealer-only repair in most cases. 6-10 hours labor.
Estimated cost: $2,000-4,000
Hard pass unless it's a CPO with comprehensive warranty coverage—the engine failure risk is simply too high for a $6,000-10,000 gamble on a used example.
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.