2015 INFINITI Q70L

The 2015 INFINITI Q70L is a luxury sedan that offers a comfortable ride, a spacious interior (especially in the “L” long-wheelbase version), and a stylish design. It came with several engine options, including a 3.7L V6, a 5.6L V8, and a hybrid variant with a 3.5L V6. The 3.7L V6 produces 330 horsepower and 270 lb-ft of torque. Owners generally appreciate the Q70L’s smooth ride and luxurious appointments, but some common criticisms include a dated infotainment system and relatively poor fuel economy, especially with the V8.

Engine

3.7L V6

• Timing Chain Tensioner Failure
  • Description/Symptoms: Rattling noise upon cold start, especially from the front of the engine. Can lead to timing chain slack, potentially causing engine damage if left unaddressed.
  • Solution: Replacement of the timing chain tensioner and potentially the timing chain itself, depending on the severity of the wear.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

5.6L V8

• Oil Consumption
  • Description/Symptoms: Excessive oil consumption, requiring frequent top-offs between oil changes. May notice blue smoke from the exhaust. Can potentially lead to engine damage if oil levels are not monitored and maintained.
  • Solution: Depending on the cause (worn piston rings, valve stem seals), the solution can range from using a heavier weight oil and more frequent oil changes to engine rebuild/replacement.
  • Estimated Cost to Fix: $500 (oil changes) - $5,000+ (engine rebuild/replacement)
  • Recalls: None Found

Transmission

All Transmissions

• Valve Body Issues
  • Description/Symptoms: Harsh shifting, slipping between gears, delayed engagement, or inability to shift. The transmission might go into limp mode. Diagnostic Trouble Codes (DTCs) related to transmission solenoids or valve body performance.
  • Solution: Replacement or repair of the valve body. In some cases, a transmission rebuild might be necessary.
  • Estimated Cost to Fix: $800 - $4,000+
  • Recalls: None Found

Suspension

• Rear Air Suspension Failure (if equipped)
  • Description/Symptoms: The rear of the vehicle sagging, uneven ride height, excessively bouncy ride. Compressor may run constantly or not at all. Diagnostic codes related to the air suspension system.
  • Solution: Replacement of the air springs, compressor, or potentially the air suspension control module.
  • Estimated Cost to Fix: $800 - $2,500+
  • Recalls: None Found

Electrical

• Infotainment System Issues
  • Description/Symptoms: Freezing, unresponsive touchscreen, navigation malfunctions, Bluetooth connectivity problems, audio system glitches.
  • Solution: Software update, replacement of the infotainment unit.
  • Estimated Cost to Fix: $100 (Software update) - $1,500+ (Replacement)
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Dead battery, requiring frequent jump starts.
  • Solution: Diagnosis and repair of the source of the parasitic draw (e.g., faulty module, improperly shutting off system).
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• Automatic Trunk Issues
  • Description/Symptoms: Trunk opens by itself without any command given, or doesn’t open at all
  • Solution: Replacement of the trunk strut assembly
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found

Interior

• Navigation Screen Delamination
  • Description/Symptoms: The coating on the navigation screen starts to bubble and peel.
  • Solution: Replacement of the navigation screen.
  • Estimated Cost to Fix: $500-$1500
  • Recalls: None Found

Summary

The 2015 INFINITI Q70L can present some notable issues. The most severe and costly problems tend to be related to the engine (timing chain tensioner failure, oil consumption) and the transmission (valve body). Electrical issues with the infotainment system can also be frustrating. The air suspension (if equipped) is another potential source of expensive repairs. Overall, potential buyers should be aware of these common problems and have the vehicle thoroughly inspected before purchase.