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2002 Yukon Denali XL with engine code P1631, what caused this code?

Vehicle: 2002 Yukon Denali XL

1 Answer

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HI there

A bad key, ignition switch or a problem with the computer can cause this code. Start by trying the relearn procedure.

P1631 GMC - Theft Deterrent Start Enable Signal Not Correct

Read more: https://www.autocodes.com/p1631_gmc.html

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