Hummer H2 P0456: Meaning, Causes, How to Fix | Drivetrain Resource
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Hummer H2 P0456: Meaning, Causes, How to Fix | Drivetrain Resource
One of the most common trouble codes with the Hummer H2 is the P0456 code. This trouble code references a number that is given to you when you plug your H2 into an OBDII scanner. P0456 Indicates that there is a small leak in the evaporative emission control system. It often appears with or is
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