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2020 G70 3.3T - Intermittent Power Loss and Wastegate Rattle

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Chris P. · rep 0 · May 22, 6:16 AM · 1 replies · solved · Question

Vehicle: 2020 Genesis G70 3.3T Sport

Hey everyone,

I've been experiencing a really frustrating issue with my 2020 Genesis G70 3.3T Sport lately. Over the past few weeks, I've noticed an intermittent but significant loss of power, almost like the turbos aren't spooling up correctly. It's most noticeable when accelerating from a stop or trying to pass on the highway.

Along with the power loss, I've started hearing a distinct rattling noise coming from the engine bay, particularly when I let off the throttle after accelerating. It sounds like it's coming from the turbo area. Sometimes the check engine light comes on, but then goes off after a day or two.

Has anyone else with a 3.3T G70 experienced anything similar? I'm worried it might be something serious like a wastegate issue or even the turbos themselves. Any advice on what to check or what this could be before I take it to the dealer would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:16 AM

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ClearTheCode admin answer:

It sounds like you're describing classic symptoms of a potential turbocharger or wastegate issue on your 2020 Genesis G70 3.3T Sport. This is a known area of concern for some turbocharged vehicles, including the 3.3T engine.

Here's a breakdown of potential causes and steps:

  1. Diagnose with an OBD-II Scanner:

    • Even if the Check Engine Light (CEL) is off, there might be pending or stored codes. Common codes related to boost issues include:
      • P0299: Turbocharger/Supercharger Underboost
      • P0234: Turbocharger/Supercharger Overboost
      • P0033: Turbocharger Bypass Valve Control Circuit
      • P0245/P0246: Turbocharger Wastegate Solenoid A Low/High
    • These codes will provide a more specific direction for diagnosis.

  2. Inspect for Vacuum Leaks:

    • The wastegate actuator often operates via vacuum. Check all vacuum lines connected to the turbochargers and wastegate actuators for cracks, disconnections, or signs of wear. A leak here can prevent proper wastegate operation.

  3. Check Wastegate Actuator Rods:

    • With the engine off and cool, try to manually move the wastegate actuator rods (if accessible). They should have some play but shouldn't feel excessively loose or stuck. The rattling noise you hear could be a loose wastegate flapper inside the turbo housing.

  4. Listen for Boost Leaks:

    • While harder to diagnose without specialized tools, listen for hissing sounds under acceleration, which could indicate a leak in the intercooler piping or charge pipes.

When to See a Shop:

  • Persistent CEL or specific turbo-related codes: If the CEL remains on or you consistently get codes like P0299 or P0234, professional diagnosis is essential.
  • Loud or worsening rattling: A persistent rattle from the turbo area, especially if it's getting louder, could indicate internal turbo damage or a failing wastegate assembly.
  • Significant power loss: Driving with reduced power and potential boost issues can put undue stress on other engine components.
  • Any signs of oil consumption or smoke from the exhaust: While not directly mentioned, these are signs of more severe turbo failure.

A qualified Genesis technician will have specialized tools to perform a boost leak test, check wastegate operation with a diagnostic scanner, and inspect the turbochargers for internal wear or damage. Addressing this promptly can prevent more extensive and costly repairs down the line.

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