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I don't know what it could be I took it to autozone & they gave me this code P1603 thats what came up on their machine as what my problem was..

Vehicle: 2001 Mitsubishi Galant 4.0 6v

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Hi there,

This code indicates a malfunction with the battery backup line. Here is some more info on this code.

P1603 MITSUBISHI - Battery Backup Line Malfunction

Read more: https://www.autocodes.com/p1603_mitsubishi.html

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