DTC Troubleshooting

DTC Troubleshooting: P2649

DTC P2649: Rocker Arm Oil Control Solenoid Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Reading and Clearing Diagnostic Trouble Codes

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

4. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2649 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 PCM.


5. Turn the ignition switch to LOCK (0).

6. Disconnect the rocker arm oil control solenoid 1P connector.

7. At the solenoid side, measure the resistance between the rocker arm oil control solenoid 1P connector terminal and the solenoid valve body.

Is there 14-30 Ohms at room temperature?
YES - Go to step 8.

NO - Go to step 12.






8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (31P).

10. Connect the rocker arm oil control solenoid 1P connector terminal to body ground with a jumper wire.






11. Check for continuity between PCM connector terminal A22 and body ground.

Is there continuity?
YES - Go to step 20.

NO - Repair open in the wire between the PCM (A22) and the rocker arm oil control solenoid, then go to step 13.






12. Replace the rocker arm oil control solenoid. Service and Repair

13. Reconnect all connectors.

14. Turn the ignition switch to ON (II).

15. Reset the PCM with the HDS.

16. Do the PCM idle learn procedure. PCM Idle Learn Procedure

17. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

18. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2649 indicated?
YES - Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM, then go to step 1.

NO - Go to step 19.


19. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 18, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.


20. Reconnect all connectors.

21. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes

22. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2649 indicated?
YES - Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 23.


23. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Pending or Confirmed DTCs were indicated in step 21, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then recheck. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.