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Old 01-16-2010, 01:08 PM
Junior Member
Join Date: Jan 2010
Posts: 2
Default Error Code P3400

My father in-laws truck is a 2007 GMC sierria and on thier way to our house his check engine light came on. We took it to Autozone and they read it. It showed a P3400 error, but they couldnt tell us what that error was in a GMC. They reset the code and it hasnt come back on yet, but we have only driven it a few miles so far.

Can anyone tell me what that code is?

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Old 01-16-2010, 03:19 PM
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Join Date: May 2009
Location: West Texas
Posts: 1,845

I think thats for cylinder deactivation. Get on the highway and cruise until the motor shuts down 4 cylinders. If it comes back on then it needs to be serviced by the dealer.
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Old 01-17-2010, 01:34 PM
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Join Date: Jan 2010
Posts: 2

Sounds about right. They were crusing down the highway when it came on the first time. Thanks for the info!
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Old 01-17-2010, 01:34 PM

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