2018 Lexus LC500h

The 2018 Lexus LC500h is a luxury hybrid coupe that combines stunning design with advanced technology and fuel efficiency. It features a multi-stage hybrid system consisting of a 3.5-liter V6 engine and an electric motor, producing a combined output of 354 horsepower and offering a unique blend of performance and economy. For 2018, the LC500h was only available as a hybrid. The non-hybrid LC500 came with a naturally aspirated 5.0-liter V8 engine that produces 471 horsepower and 398 lb-ft of torque, paired with a 10-speed automatic transmission. Owners often praise the LC500h for its striking aesthetics, luxurious interior, and comfortable ride. However, some common criticisms include the complex infotainment system, limited rear passenger space, and somewhat muted engine sound compared to the V8 variant.

Electric Motor

Multi-Stage Hybrid System (3.5L V6 with Electric Motor)

• Hybrid System Malfunction
  • Description/Symptoms: The hybrid system warning light illuminates, and the car may experience reduced power, limp mode, or difficulty starting. Diagnostic codes often point to issues within the high-voltage battery pack, inverter, or motor-generator units.
  • Solution: Diagnosis involves scanning for diagnostic trouble codes (DTCs) using a Lexus-specific scan tool. Replacement or repair of the affected component (high-voltage battery, inverter, or motor-generator) is typically required. In some cases, a software update can resolve the issue.
  • Estimated Cost to Fix: $2,000 - $10,000+ depending on the faulty component and whether it can be repaired or needs replacement.
  • Recalls: None Found

Transmission

Hybrid Transmission (ECVT with 4-speed Automatic)

• Rough Shifting/Jerking
  • Description/Symptoms: Some owners have reported experiencing rough shifts, jerking, or hesitation during acceleration or deceleration. This is more frequently noted when the system transitions between electric and gasoline power.
  • Solution: A dealer software reflash of the Transmission Control Module (TCM) may resolve the issue. In more severe cases, inspection of the transaxle components and potential replacement of damaged parts is required.
  • Estimated Cost to Fix: $100-$300 for software reflash, $1,000-$5,000+ for transaxle repair or replacement.
  • Recalls: None Found

Electrical

• Infotainment System Freezing/Crashing
  • Description/Symptoms: The Lexus Enform infotainment system, known for its complexity and touchpad interface, can occasionally freeze, crash, or become unresponsive. This can affect navigation, audio, and climate control functions.
  • Solution: A system reset may temporarily resolve the issue. A software update from the dealership can provide a more permanent fix. In rare cases, replacement of the infotainment unit might be necessary.
  • Estimated Cost to Fix: $0 (system reset), $100-$300 (software update), $1,000+ (infotainment unit replacement).
  • Recalls: None Found
• Sensor Malfunctions (e.g., Parking Sensors, Blind Spot Monitoring)
  • Description/Symptoms: Malfunctioning parking sensors or blind spot monitoring systems can provide false alerts or fail to detect obstacles.
  • Solution: Diagnosis involves checking the sensor connections and wiring. Replacement of the faulty sensor is typically required.
  • Estimated Cost to Fix: $200 - $800+ depending on the sensor and labor costs.
  • Recalls: None Found

Interior

• Rattling/Squeaking Noises
  • Description/Symptoms: Some owners have reported experiencing rattling or squeaking noises emanating from the dashboard, door panels, or rear deck area, especially when driving on rough roads.
  • Solution: Identifying the source of the noise and applying sound-deadening material or tightening loose fasteners is generally required.
  • Estimated Cost to Fix: $100 - $500+ depending on the complexity of the repair.
  • Recalls: None Found

Summary

The 2018 Lexus LC500h is a generally reliable vehicle, but some owners have reported issues with the hybrid system, transmission, electrical components, and interior trim. The severity of these issues can range from minor inconveniences to major repairs, with costs varying accordingly. While some problems can be resolved with software updates or simple fixes, others may require more extensive and expensive repairs. Potential buyers should be aware of these potential issues and thoroughly inspect any used LC500h before purchase.