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Discussion Starter · #1 ·
I have a 2020 V6 nine speed Chevy blazer. The Transmission is very smooth when shifting. However when you decelerate there is a high-pitched whine as the car slows down. Does anybody else hear this?
 

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I have a 2020 V6 nine speed Chevy blazer. The Transmission is very smooth when shifting. However when you decelerate there is a high-pitched whine as the car slows down. Does anybody else hear this?
How cold is it outside? Is the transmission fully warmed up?
When it was -40C and below, it whined until it was fully warmed up.
 

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Discussion Starter · #3 ·
I live in Arizona. Temperature is never below freezing and has been in the 70s-80s during the day
 

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2021 Blazer in for transmission service with only 5,000 miles. Codes p0700, p25a2, u0146
We heard a strange noise at 65 to 75 mph but no code at that time.
Has been 4 days in dealer and the service advisor cannot tell me what the problem is and any timeline for a fix.
Has anyone else had this problem?
 
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