2006 INFINITI QX56

The 2006 INFINITI QX56 is a full-size SUV known for its powerful engine, comfortable ride, and spacious interior. It was offered with a single engine option: a 5.6L VK56DE V8 engine producing 315 horsepower and 390 lb-ft of torque, paired with a 5-speed automatic transmission. Owners generally appreciate the QX56 for its towing capacity and luxury features, but some find its large size and fuel consumption to be drawbacks.

Engine

5.6L VK56DE V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: Rattling noise upon start-up, especially when cold. This indicates the timing chain tensioner is not maintaining proper tension, which can lead to eventual timing chain failure.
  • Solution: Replacing the timing chain tensioner(s) and potentially the timing chain itself.
  • Estimated Cost to Fix: $1000 - $2000+
  • Recalls: None Found
• Exhaust Manifold Leaks
  • Description/Symptoms: Ticking or hissing sound, especially when the engine is cold. Reduced fuel economy and a smell of exhaust fumes inside the cabin can also occur. Often caused by cracked exhaust manifolds.
  • Solution: Replacing the cracked exhaust manifold(s).
  • Estimated Cost to Fix: $500 - $1500+ per side (depending on manifold and labor costs).
  • Recalls: None Found

Transmission

5-Speed Automatic

• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, or failure to shift at all. Can be intermittent at first, worsening over time.
  • Solution: Replacing or rebuilding the valve body. In some cases, a complete transmission rebuild or replacement might be necessary.
  • Estimated Cost to Fix: $500 - $3000+
  • Recalls: None Found

Suspension

• Air Suspension Failure (Rear)
  • Description/Symptoms: Rear of the vehicle sagging or sitting unevenly. The air compressor may run constantly or not at all. Error messages on the dashboard related to the suspension system.
  • Solution: Replacing the air springs/bags, air compressor, or ride height sensors.
  • Estimated Cost to Fix: $300 - $1500+ per component (depending on which parts need replacement).
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Battery draining overnight or within a few days of non-use. Difficulty starting the vehicle.
  • Solution: Identifying and repairing the source of the parasitic drain. This could involve testing various circuits and components to find the culprit, such as a faulty module, relay, or aftermarket accessory.
  • Estimated Cost to Fix: $100 - $500+ (depending on the complexity of the issue).
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door lock not responding to the key fob or interior lock switch. The door may be difficult or impossible to lock or unlock.
  • Solution: Replacing the faulty door lock actuator.
  • Estimated Cost to Fix: $150 - $400+ per door.
  • Recalls: None Found

Exterior

• Automatic Liftgate Issues
  • Description/Symptoms: Liftgate failing to open or close automatically, getting stuck mid-operation, or making unusual noises.
  • Solution: Replacing the liftgate motor, struts, or control module.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: Navigation screen not working, freezing, or displaying incorrect information. GPS signal loss.
  • Solution: Replacing the navigation unit or sending it in for repair.
  • Estimated Cost to Fix: $200 - $1000+
  • Recalls: None Found
• Seat Heater Malfunction
  • Description/Symptoms: Seat heater not working, only partially heating, or overheating.
  • Solution: Replacing the seat heater element or control module.
  • Estimated Cost to Fix: $200 - $500+ per seat.
  • Recalls: None Found

Summary

The 2006 INFINITI QX56, while generally reliable, can suffer from certain issues as it ages. The most common problems involve the engine (timing chain and exhaust manifolds), transmission (valve body), and suspension (air suspension). Electrical issues, such as battery drain and door lock actuator failures, are also reported. Interior components like the navigation system and seat heaters can also malfunction. The severity of these issues ranges from minor inconveniences to potentially costly repairs. Prospective buyers should be aware of these potential problems and factor them into their purchasing decision. Always get a pre-purchase inspection.