Inner Wheelhouse Corrosion

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Joined
Apr 11, 2025
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Location
New York
I just picked up an 06 GX470 back in November. Frame is in truly great shape, 130K miles, no corrosion bubbling around the wheelwells. Fast forward a few months, I'm installing a backup camera and routing the wires through the rear trim and I find my rear floor insulation is soaked. I'm thinking the usual suspects, rear windows & maybe sunroof, but I pull the insulation out to find that the piece of sheetmetal that the third row assembly bolts into (I believe it's the inner wheelhouse) is corroded straight through. I have a couple of questions:

  1. Does anyone have experience with this? How would this area maintain such a high moisture level to corrode through layers of sheetmetal? What is on the other side (the road side) of this piece?
  2. Am I right in thinking that this is the inner wheelhouse? Lexus Part
  3. It appears that this is a separate piece of sheetmetal than the rest of the inner structure body - can a body shop pull the affected piece, swap it out, apply some silicone, or am I in for a whole sheetmetal patching job?
IMG_3217.jpg
 
Look up a shop in NJ called Garden State Undercoating - this is right up their alley. A lot of body shops are too lazy to touch those jobs.
 
This is more common than you'd think. Mine did this too. Patched it up from both sides, added fresh undercoating in the wheel wells, and went on with my life. I have zero plans to use my 3rd row seats again, however if that's in your plans this needs to be professionally repaired.
 
Mine has been in Chicago its whole life and it is fairly rusty for sure. I've got this problem too, discovered it while power washing my wheel wells lol
 

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