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2018 Q50 Red Sport Turbo Failure & Coolant Loss - What are my options?

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Sarah K. · rep 0 · May 22, 5:10 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

My 2018 Infiniti Q50 Red Sport 400 with about 70,000 miles is having serious issues. I've noticed significant coolant loss, and now I'm hearing a distinct whining noise from the engine bay, especially under acceleration. The car also feels noticeably down on power.

I'm worried it's the turbos, which I hear is a common problem for the VR30DDTT engine in these models. I've seen some forum posts about this. What should I do? Is this issue covered by any extended warranty programs or specific Technical Service Bulletins (TSBs) from Infiniti?

I'm trying to figure out the best course of action before taking it to a shop. Any advice on diagnostics or what to expect would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:10 AM

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ClearTheCode admin answer:

It sounds like you're experiencing classic symptoms of a failing turbocharger, often accompanied by coolant system issues, which are unfortunately known concerns for early VR30DDTT engines in the Q50 Red Sport. Here's what you should consider:

  1. Confirm the Diagnosis: A professional diagnosis is crucial. A mechanic will typically check for:

    • Coolant Leaks: Inspect the turbocharger coolant lines and connections for leaks. The turbos are liquid-cooled, and leaks can lead to overheating and premature failure.
    • Turbocharger Play: Check for excessive shaft play in the turbochargers, indicating internal wear.
    • Boost Pressure: Monitor boost pressure during a test drive or dyno run. Low boost can trigger codes like P0299 (Turbocharger/Supercharger Underboost).
    • Misfires: Coolant entering the combustion chamber due to turbo failure can cause misfires (P030x codes).

  2. Common Causes: The primary cause is often related to the design of the turbocharger's coolant lines and seals, which can degrade over time, leading to coolant loss and subsequent turbo damage due to overheating.

  3. TSBs and Recalls: While there haven't been widespread recalls specifically for turbo failure, Infiniti has issued TSBs related to coolant leaks and engine performance for the VR30DDTT. It's worth checking with your Infiniti dealer if your VIN falls under any relevant service campaigns or extended warranty programs related to the turbos or engine components. Some owners have received assistance, especially if they have a good service history with Infiniti.

  4. When to See a Shop: You should take your Q50 to a reputable Infiniti specialist or dealership immediately. Continuing to drive with a failing turbo can lead to more severe engine damage, including catalytic converter failure from oil burning or even complete engine seizure if coolant loss is significant. Early intervention can potentially save you from more costly repairs down the line. Be prepared for a significant repair cost if the turbos need replacement, as it's a labor-intensive job.

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