2002 Volvo S80 2.9L Twin Turbo with engine code P0573

Question

Information window says :brake assist service require; there is no check engine light on. This info comes on then turns off. Error code says P0573. ---brake circuit a is high! What does that mean & how do I fix this. Thanks for your help---really bugged about this---thanks

Answer 1

P0573 brake pedal sensor 

Answer 2

P0573 Volvo Code - Brake Switch 'A' Circuit High
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