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How to fix cylinder deactivation bank one in a 2008 chevorlet impala SS

Vehicle: 2008 Chevorlet impala SS 5.3 V8

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Are there any other symptoms or codes?

Usually that code is combine with other codes, but if no other codes are present you may have a faulty Cylinder Deactivation Solenoid.

P3400 CHEVROLET - Cylinder Deactivation System Performance

Read more: https://www.autocodes.com/p3400_chevrolet.html

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