2011 INFINITI QX56

The 2011 INFINITI QX56 is a full-size luxury SUV known for its powerful engine, spacious interior, and comfortable ride. The QX56 came standard with a 5.6-liter V8 engine producing 400 horsepower and 413 lb-ft of torque. This engine was paired with a 7-speed automatic transmission. Owners often appreciate the QX56’s towing capacity and luxurious features, but some dislike its large size and fuel consumption. Some common complaints revolve around electrical issues and certain mechanical failures as the vehicle ages.

Engine

5.6L VK56VD V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: Ticking or rattling noise from the engine, especially on startup. This indicates a worn or failing timing chain tensioner which, if left unaddressed, can lead to catastrophic engine damage.
  • Solution: Replacement of the timing chain tensioner, guides, and potentially the timing chain itself if excessive wear is present.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Oil Consumption
  • Description/Symptoms: Noticeable decrease in oil level between oil changes, blue smoke from the exhaust, and potential engine damage if oil levels are not maintained.
  • Solution: Depending on the cause, the solution can range from replacing PCV valve to more extensive repairs such as piston ring replacement or engine rebuild.
  • Estimated Cost to Fix: $50 - $5,000+
  • Recalls: None Found

Transmission

7-Speed Automatic (RE7R01A)

• Torque Converter Shudder
  • Description/Symptoms: A shaking or shuddering sensation felt while driving, often at lower speeds or during light acceleration. This can be caused by degradation of the torque converter fluid or internal torque converter damage.
  • Solution: A transmission fluid flush, or torque converter replacement.
  • Estimated Cost to Fix: $300 - $1,500+
  • Recalls: None Found
• Rough Shifting
  • Description/Symptoms: Harsh or delayed shifts between gears, particularly when cold.
  • Solution: Transmission fluid flush and relearn or full transmission replacement.
  • Estimated Cost to Fix: $300 - $5,000+
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure (if equipped)
  • Description/Symptoms: The rear of the vehicle sagging, inability to maintain ride height, and warning lights on the dashboard. A failing compressor is unable to properly inflate the air suspension system.
  • Solution: Replacement of the air suspension compressor. It’s recommended to inspect and replace the air struts if they show signs of leaking.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• Air Strut Leaks (if equipped)
  • Description/Symptoms: Vehicle leaning to one side, especially after being parked overnight, a rough or bouncy ride, and hissing sounds from the air struts.
  • Solution: Replacement of the leaking air struts.
  • Estimated Cost to Fix: $1,000 - $3,000+ per strut (depending on if replacing in pairs)
  • Recalls: None Found

Electrical

• Navigation/Infotainment System Malfunctions
  • Description/Symptoms: Freezing, crashing, unresponsive touchscreen, loss of navigation functionality, and other issues with the infotainment system.
  • Solution: Software update, replacement of the head unit, or repair of wiring harness.
  • Estimated Cost to Fix: $100 - $2,000+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: The battery dying frequently, especially if the vehicle is left sitting for extended periods. This can be caused by a parasitic draw from a faulty module or component.
  • Solution: Diagnostic testing to identify the source of the parasitic draw and repair or replace the faulty component.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: The door lock will not lock or unlock with the key fob, or door switch.
  • Solution: Replacement of the door lock actuator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Exterior

• Liftgate Actuator Failure
  • Description/Symptoms: The power liftgate not opening or closing properly, requiring manual operation.
  • Solution: Replacement of the liftgate actuator.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Interior

• Seat Heater Failure
  • Description/Symptoms: The seat heaters not working or only working intermittently.
  • Solution: Replacement of the seat heater element or module.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found

Summary

The 2011 INFINITI QX56, while a luxurious and powerful SUV, is prone to certain issues as it ages. Engine-related problems like timing chain tensioner failure and oil consumption can be costly to repair. Transmission issues such as torque converter shudder and rough shifting are also commonly reported. Electrical glitches, particularly with the infotainment system, can be frustrating. Suspension issues, especially with the air suspension system (if equipped), can impact ride quality and require expensive repairs. Overall, while the QX56 offers a comfortable and capable driving experience, potential buyers should be aware of these common issues and factor in potential repair costs. The severity of these issues can range from minor inconveniences to major mechanical failures, with repair costs varying widely depending on the problem and the repair shop.