The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2017 Q50 Red Sport - Loss of Power, CEL, and Turbo Concerns (P0299)

0

Mike T. · rep 0 · May 25, 3:46 AM · 1 replies · solved · Question

Vehicle: 2017 Infiniti Q50 Red Sport 400

Hey everyone,

I've got a 2017 Infiniti Q50 Red Sport 400 that's been giving me some headaches. Recently, I've noticed a significant loss of power, especially during acceleration, and the car just doesn't feel as responsive as it used to. The check engine light came on last week, and when I pulled the code, it showed P0299 (Turbocharger/Supercharger Underboost).

I've heard about some issues with the turbos on these VR30DDTT engines, but I'm hoping it's not a major repair. Has anyone else experienced this specific code or similar symptoms with their Q50 Red Sport? What was the fix? Any advice on what I should check first before taking it to the dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:46 AM

0

ClearTheCode admin answer:

The P0299 code indicates that the engine's control module has detected that the actual boost pressure is lower than the desired boost pressure. This is a common issue on the VR30DDTT engine, and it's important to address it promptly to prevent further complications.

Causes for P0299 (Underboost) on VR30DDTT:

  1. Boost Leaks: This is often the simplest cause. Check all intercooler piping, charge pipes, and vacuum lines for cracks, loose connections, or damaged O-rings. A smoke test can help pinpoint these leaks.
  2. Wastegate Actuator Issues: The electronic wastegate actuators on the VR30DDTT can sometimes fail or become sticky, preventing the wastegate from closing fully, which leads to a loss of boost.
  3. Turbocharger Failure: While less common, internal turbocharger damage (e.g., worn bearings, cracked housing) can lead to underboost. The VR30's turbos are water-cooled, and issues with the cooling system can prematurely wear them.
  4. Diverter Valve Malfunction: A faulty diverter valve (blow-off valve) can leak boost pressure.
  5. MAP Sensor or Boost Sensor Issues: A faulty sensor might be providing incorrect readings to the ECU, leading it to believe there's an underboost condition.
  6. Catalytic Converter Restriction: A clogged catalytic converter can create excessive back pressure, which can indirectly affect turbo performance.

When to See a Shop:

  1. Immediate Action: If you're experiencing a significant loss of power, it's best to have it professionally diagnosed as soon as possible. Continuing to drive with an underboost condition can stress other engine components.
  2. Diagnostic Tools: A specialized Infiniti or Nissan diagnostic tool (like CONSULT) can monitor boost pressure, wastegate duty cycles, and sensor readings in real-time, providing a more accurate diagnosis than generic OBD-II scanners.
  3. Complex Repairs: Repairs involving turbochargers, wastegate actuators, or extensive boost leak detection are best left to experienced technicians. They have the expertise and specialized tools to perform these repairs correctly and ensure proper reassembly and calibration.
Menu

Help & account