DTC Troubleshooting: P2648 (21)
DTC P2648:
 Rocker Arm Oil Control Solenoid Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Do the VTEC TEST in the INSPECTION MENU with the HDS.
Is the result OK?
YES -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM.■
NO -
Go to Step 4 .
  1. Turn the ignition switch OFF.
  1. Disconnect the rocker arm oil control solenoid 2P connector.
  1. Measure resistance between rocker arm oil control solenoid 2P connector terminals No. 1 and No. 2.
Is there 14−30 Ω at room temperature?
YES -
Go to Step 7 .
NO -
Go to Step 10 .
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM connector B (44P).