What does diagnostic trouble code P2646 mean for a 2003 Honda Accord LX?
P2646 Rocker Arm Actuator System Performance or Stuck Off. This
is a generic code. The code for VTEC is DTC P2646 (VTEC oil
pressure switch circuit
low voltage) The fix is to replace the VTEC Oil Pressure Switch
(P/N
37250-PNE-G01, H/C 6737217).