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Car engine noise happens when the battery is full

(2008 Toyota Prius)
in Clinton, IA on January 21, 2014
Car engine noise happens when the battery is full, especially when going down the slopes and the battery charge full...

coming down when i Stomps on the accelerator
whats the problem ??
Displaying 2 answers & 0 comments
Popular Answer
on January 21, 2014
Nobody knows! A Toyota tech 'might' if he test drove it then ran a diagnostic test. Oh you'll probably get plenty of gusses! Hang in there!!

Here you go!!
of Gillespie's Auto Service on January 21, 2014
Are you using "B" mode when going downhill?
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