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What does this code mean P1815 for Chevrolet Malibu? Is it serious?

Vehicle: Chevrolet Malibu

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P1815 : Transmission Fluid Pressure (TFP) Valve Position Switch- Start In Wrong Range

The possible cause if a faulty switch or a a problem with the transmission valve body. If there are no shifting problem, I suggest starting by replacing the transmission fluid.

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