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The P2647 error code found in the 2006 Honda Odyssey is related to a problem with the rocker arm oil pressure switch. It occurs when a higher voltage than normal is detected from the switch, often due to issues with wiring or faulty connections. This can also be caused by a malfunction in the Variable Valve Timing and Lift Electronic Control (VTEC) system. Honda has issued a Technical Service Bulletin (TSB) for certain models, including the 2003-2012 Accord L4, 2002-2005 Civic Si, 2002-2009 CR-V, 2011 CR-Z, 2003-2011 Element, and 2007-2011 Honda Fit, recommending the replacement of the VTEC system.
The error code p2647 on a 2006 Honda Odyssey indicates that there is a high voltage issue with the rocker arm oil pressure switch circuit.