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2018 Q50 Red Sport 400 - Reduced Power Mode & Turbo Lag Issues

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Amanda S. · rep 0 · May 22, 5:11 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

Hey everyone,

I'm experiencing some frustrating issues with my 2018 Infiniti Q50 Red Sport 400. Lately, the car has been randomly going into a reduced power mode, especially under hard acceleration. It feels like the turbos aren't spooling up correctly, and there's significant turbo lag that wasn't there before.

Sometimes, after restarting the car, the power returns to normal, but it's becoming more frequent. I haven't seen any specific warning lights on the dash, but the performance drop is very noticeable. I'm worried about potential damage or if this is a known reliability issue with the VR30DDTT engine.

Has anyone else with a 2016-2026 Q50 or Q60 Red Sport experienced this? What could be causing this, and what should I be looking for? Any advice on diagnostics or common fixes would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It sounds like your 2018 Infiniti Q50 Red Sport 400 is experiencing a common issue with the VR30DDTT engine related to its twin-turbo system or associated components. The 'reduced power mode' is often the car's way of protecting itself when it detects a fault that could lead to engine damage. Here's a breakdown of potential causes and steps:

  1. Check for Stored Diagnostic Trouble Codes (DTCs): Even if no check engine light is illuminated, there might be pending or stored codes. Use an OBD-II scanner to check for codes like:

    • P0299: Turbocharger/Supercharger Underboost
    • P0234: Turbocharger/Supercharger Overboost
    • P00C7: Intake Air Mass Plausibility (less common but can be related)
    • Other codes related to wastegate actuators or turbo speed sensors.

  2. Common Causes for VR30DDTT Reduced Power:

    • Turbo Speed Sensors: These are known to fail on early VR30DDTT engines, leading to incorrect turbo speed readings and the ECU limiting boost.
    • Wastegate Actuators: Faulty electronic wastegate actuators can prevent proper boost control, causing either underboost or overboost conditions.
    • Intercooler System Issues: The Q50 Red Sport uses an air-to-water intercooler system. Low coolant levels in this system or a failing intercooler pump can lead to high intake air temperatures, causing the ECU to pull timing and reduce power.
    • Boost Leaks: Although less common without a persistent check engine light, a significant boost leak in the charge pipes could cause underboost.
    • Fuel System: Less likely without specific fuel pressure codes, but a failing high-pressure fuel pump could also cause power loss.

  3. When to See a Shop:

    • Immediately: If the reduced power mode becomes constant, or if you notice any unusual noises from the engine bay (whining, rattling), or if a check engine light does illuminate.
    • As soon as possible: Even if intermittent, this issue can indicate a component that is failing and could potentially lead to more significant damage if left unaddressed. A qualified Infiniti technician will have specialized diagnostic tools to pinpoint the exact cause, especially for turbo-related issues and the intercooler system. They can perform boost leak tests, check intercooler pump operation, and verify turbo speed sensor readings.
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