DTC P2647 (19-21 9-Speed A/T)

DTC P2647  : Rocker Arm Oil Pressure Switch A (Bank 1) Circuit High Voltage

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
• If DTC P2648 and/or P2649 are stored at the same time as DTC P2647, troubleshoot those DTCs first, then recheck for DTC P2647.

DTC (PGM-FI)

1. Oil level check

   - 1. Check the engine oil level.

   Is the level OK?

   YES 

   Go to step 2.

   NO 

   Adjust the engine oil to the proper level .

2. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Turn the vehicle to the ON mode.

   - 5. Select the VTEC+VCM TEST in the INSPECTION MENU with the HDS, then select the VEB VTEC TEST with the HDS.

   VEB VTEC TEST

   Does the HDS indicate Normal?

   YES 

   Intermittent failure, the system is OK at this time.

   Check for poor connections or loose terminals at rocker arm oil pressure switch A (Bank 1) and the PCM.

   If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

   NO 

   The failure is duplicated. Go to step 3.

3. Rocker arm oil pressure switch A (Bank 1) internal circuit check

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Rocker arm oil pressure switch A (Bank 1) 2P connector

   - 3. At the rocker arm oil pressure switch side, check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil pressure switch A (Bank 1) 2P connector: disconnected
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector (male terminals) No. 1 (switch side) :
   Test point 2	Rocker arm oil pressure switch A (Bank 1) 2P connector (male terminals) No. 2 (switch side) :

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Replace rocker arm oil pressure switch A (Bank 1) - Refer to: Rocker Arm Oil Pressure Switch A (Bank 1) and Rocker Arm Oil Pressure Switch B (Bank 1) Removal and Installation .

4. Open wire check (VTMB1 line)

   - 1. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 2. Disconnect the following connector.

   PCM connector E (80P)

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil pressure switch A (Bank 1) 2P connector: disconnected
   	PCM connector E (80P): disconnected
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector (female terminals) No. 2:
   Test point 2	PCM connector E (80P) No. 31 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) .

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Go to step 5.

   NO 

   Repair an open in the VTMB1 wire between the PCM (E31) and rocker arm oil pressure switch A (Bank 1).

5. Open wire check (VTMB1 LG line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil pressure switch A (Bank 1) 2P connector: disconnected
   	PCM connector E (80P): disconnected
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector (female terminals) No. 1:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The VTMB1 LG wire is OK.

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) .

   If DTC P2647 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) .

   NO 

   Repair an open in the VTMB1 LG wire between rocker arm oil pressure switch A (Bank 1), G101 and G202.