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i have the same code on my lumina ss 2008 6.0 and the transmission drops down to 5th once the the check engine is showed so what shall i do

shall i change the oil pressure sensor or shall i change the transmission TCM

please guide me

Vehicle: 2008 cheveolate lumina ss 6.0

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P0521 Oil pressure sensor / switch

It is very worth the try for the oil pressure sensor to be tried .

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