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 to ON (II).
  1. Clear the DTC with the HDS.
  1. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 indicated?
YES -
Go to Step 5 .
NO -
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/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the rocker arm oil control solenoid 2P connector.
  1. Measure the 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 8 .
NO -
Go to Step 11 .
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (49P).