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I sent two links of the same video. My apologies.
I have a 2015 Toyota Venza V6, all wheel drive (AWD). There is sound underneath the car during morning / cold start. Once the engine starts, reverse is engaged while foot on brake, after 15 seconds, a sound like metal scratching or rotating metal chain is heard. Once brake is released and car rolls back small and then stopped (with foot still on brake and reverse engaged), the sound starts again. This happens over and over until the car is warm and then goes away. It barely happens until the next cold start in the morning. This does not happen on “drive’ when driving forward.
Please see the attached two video links.
I took it to Toyota dealership, left he car overnight many time. After being told that sound cant be replicated, one of their service advisor heard it. I was told it was transmission/transaxle (U660F) problem. Car was under warranty and Toyota replaced the transaxle with a remanufactured one. The same sound is present after the remanufactured transaxle is installed. I kept on taking the issue back to the dealership with firm request to address it. Now, As next move, Toyota wants to take ATF (oil) from the current transaxle for analysis. What could the problem be? I am speculating if it could be few things (1) front transfer case as the sound comes from that area as well (2) exhaust or catalytic converter related or (3) engine/transaxle mount. The latter two are based on what I tried to research online
Please help as it is quite exhausting to deal with dealership whose interest often (may be not all) is not the consumer but the manufacturer. Incase you have difficulty opening the links, let me know and will try to post it again.