Error Code P3400 - Truck Forums

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Old 01-16-2010, 02:08 PM
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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, 04:19 PM
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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, 02:34 PM
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Sounds about right. They were crusing down the highway when it came on the first time. Thanks for the info!
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