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2017 Q50 Red Sport - P0299 Underboost and Turbo Rattle - Reliability Concerns

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Rachel A. · rep 0 · May 22, 5:11 AM · 1 replies · solved · Question

Vehicle: 2017 Infiniti Q50 Red Sport 400

Hey everyone,

I'm looking for some advice on my 2017 Infiniti Q50 Red Sport 400. Lately, I've been experiencing a noticeable loss of power, especially under acceleration, and the check engine light came on. When I scanned it, I got a P0299 code, which points to an 'Engine Underboost' condition.

Beyond the power loss, I've also started hearing a distinct rattling noise from what sounds like the turbocharger area, particularly when I let off the throttle. It's pretty concerning for a car with only 60,000 miles on it. I've heard some chatter online about VR30DDTT turbo issues, but I'm hoping it's not a full replacement.

Has anyone else with a 2017 Q50 Red Sport experienced this specific combination of P0299 and turbo rattle? What was your experience with diagnosis and repair? Is this a common reliability issue for these models, and what should I expect in terms of cost if it's a turbo replacement?

Any insights or recommendations would be greatly appreciated before I take it to the dealership. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:11 AM

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This is a very common and well-documented issue for the VR30DDTT engine found in your 2017 Infiniti Q50 Red Sport 400, particularly with early production models. The P0299 "Engine Underboost" code, combined with a rattling noise, strongly suggests a problem with one or both of your turbochargers, often related to the wastegate actuators or the turbocharger itself.

Here's a breakdown of potential causes and what to do:

  1. Common Causes:

    • Wastegate Actuator Failure: The most frequent culprit. The internal components of the wastegate actuator can wear out, leading to improper wastegate operation. This results in either the wastegate staying partially open (underboost) or rattling due to excessive play.
    • Turbocharger Bearing Wear: Less common but possible, especially if the car has been driven hard or maintenance has been neglected. Worn bearings can cause shaft play, leading to rattling and reduced efficiency.
    • Boost Leak: While P0299 points to underboost, a significant boost leak in the charge pipes or intercooler system could also contribute, though the rattle points more directly to the turbo assembly.
    • Diverter Valve Issues: A faulty diverter valve could also cause boost issues, but typically without the distinct rattle.

  2. When to See a Shop:

    • Immediately: Given the P0299 code and the audible rattling, it's crucial to have your vehicle inspected by a qualified Infiniti technician or a reputable independent shop specializing in Infiniti/Nissan performance. Continuing to drive with a failing turbocharger can lead to more severe engine damage.
    • Diagnosis: The shop will likely perform a boost leak test, inspect the turbochargers for shaft play, and check the wastegate actuator rods for excessive movement. They may also use a smoke machine to detect any leaks in the intake system.

  3. Potential Repair:

    • Wastegate Actuator Replacement: If only the actuator is faulty, some shops might attempt to replace just the actuator, but often, the entire turbocharger assembly is replaced as the actuators are integrated and not always separately serviceable by Infiniti.
    • Turbocharger Replacement: In many cases, especially with the rattling, both turbochargers (left and right) are replaced as a pair. Infiniti has released revised turbocharger designs to address these early production issues.
    • Cost: This can be a significant repair. Expect costs to be in the range of $3,000 - $6,000+ for parts and labor, depending on whether one or both turbos are replaced and if you go to a dealership or an independent specialist. Check if your vehicle is still under any extended powertrain warranty or if Infiniti has any goodwill programs for this known issue.

It's important to get this addressed promptly to prevent further complications.

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