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2018 Q50 3.0t Loss of Power and Check Engine Light - Turbo Issue?

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Kim L. · rep 0 · May 22, 5:04 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 3.0t Luxe

Hey everyone,

I'm having a frustrating issue with my 2018 Infiniti Q50 3.0t Luxe. Lately, I've noticed a significant loss of power, especially when accelerating from a stop or trying to pass on the highway. It feels like the car is struggling to build boost.

The check engine light came on a few days ago and hasn't gone off. I haven't had a chance to get the codes read yet, but I'm worried it might be something serious with the turbos or the boost system. Has anyone else experienced this with their VR30DDTT engine?

Any advice on what this could be or what I should check first would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:04 AM

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ClearTheCode admin answer:

It sounds like your 2018 Infiniti Q50 3.0t Luxe is experiencing a common issue related to the VR30DDTT engine's forced induction system. A loss of power accompanied by a Check Engine Light (CEL) often points to problems with boost pressure regulation.

Here are the likely causes and steps you should take:

  1. Get the OBD-II Codes Read Immediately: This is the most crucial first step. Common codes associated with boost issues on the VR30DDTT include:

    • P0234: Turbocharger/Supercharger Overboost Condition
    • P0299: Turbocharger/Supercharger Underboost Condition
    • P00BD: Mass Air Flow (MAF) Sensor 'A' Circuit Range/Performance - Air Flow Too High
    • P00BC: Mass Air Flow (MAF) Sensor 'A' Circuit Range/Performance - Air Flow Too Low
    • Codes related to wastegate solenoid or turbo actuator faults.

  2. Common Causes for Boost Issues:

    • Turbocharger Wastegate Actuator Failure: This is a very common culprit on the VR30DDTT. The electronic actuators can fail, leading to either constant overboost or underboost.
    • Boost Leak: Hoses or intercooler connections can develop leaks, causing a loss of pressure.
    • MAF Sensor Malfunction: A faulty Mass Air Flow sensor can send incorrect readings to the ECU, leading to improper fuel-air mixture and reduced power.
    • Diverter Valve/Bypass Valve Issues: These valves help regulate boost and can stick or fail.
    • Clogged Catalytic Converter: While less common for sudden power loss, a restricted exhaust can impact turbo performance.

  3. When to See a Shop:

    • Immediately: If the CEL is flashing, or if you notice any unusual noises (whining, rattling from the engine bay), pull over safely and have the vehicle towed to a reputable Infiniti specialist or dealership.
    • As Soon As Possible: Even if the CEL is solid, a significant loss of power indicates a problem that needs prompt attention. Continuing to drive with boost issues can potentially lead to further damage to the turbochargers or engine components.

A qualified technician will use diagnostic tools to pinpoint the exact cause, which may involve checking boost pressure, inspecting vacuum lines, testing actuators, and performing a smoke test for leaks.

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