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

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Carguy1 · Answer 1 · 2017-12-23T13:13:07+0000

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