DTC P2623

DTC P2623 : High Pressure Fuel Pump Spill Valve Malfunction

NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

DTC Description	Confirmed DTC	Pending DTC
P2623 High Pressure Fuel Pump Spill Valve Malfunction

DTC (PGM-FI)

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. Start the engine (If the engine does not start, crank the engine for 20 seconds).

- 5. Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC
P0201 No. 1 Cylinder Injector Circuit Malfunction
P0202 No. 2 Cylinder Injector Circuit Malfunction
P0203 No. 3 Cylinder Injector Circuit Malfunction
P0204 No. 4 Cylinder Injector Circuit Malfunction
P0205 No. 5 Cylinder Injector Circuit Malfunction
P0206 No. 6 Cylinder Injector Circuit Malfunction
P2623 High Pressure Fuel Pump Spill Valve Malfunction

Are DTC P2623 and P0201, P0202, P0203, P0204, P0205, or P0206 indicated at the same time?

YES

The failure is duplicated. Go to step 2.

The failure is duplicated. Go to step 8.

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the high pressure fuel pump 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 .

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

- 2. Remove the injector relay.

- 3. Test the injector relay.

Is the relay OK?

YES

Go to step 3.

NO

Replace the injector relay.

Open wire check (+B INJ line)

- 1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test condition	Injector relay: disconnected
Test point 1	Injector relay 4P socket (female terminals) No. 1 and No. 3:
Test point 2	Body ground

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

Is there battery voltage?

YES

The +B INJ wires are OK. Go to step 5.

Go to step 4.

Fuse check

- 1. Check the following fuse.

Fuse

No. A12 - Refer to:
Fuse to Components Index (With Auto Idle Stop System) (2019 2020 2021), or
Fuse to Components Index (Without Auto Idle Stop System) (2019 2020 2021), or
Fuse to Components Index (Without Auto Idle Stop System) (2016 2017 2018), or
Fuse to Components Index (With Auto Idle Stop System) (2016 2017 2018) .

Is the fuse OK?

YES

Repair an open in the +B INJ wire between the No. A12 fuse and the injector relay. If needed, replace the under-hood fuse/relay box .

Repair a short in the +B INJ wire between the No. A12 fuse and the injector relay. Also replace the No. A12 fuse. If needed, replace the under-hood fuse/relay box .

Determine possible failure area (M RLY line, others)

- 1. Turn the vehicle to the ON mode.

- 2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle in ON mode
Test condition	Injector relay: disconnected
Test point 1	Injector relay 4P socket (female terminals) No. 3:
Test point 2	Injector relay 4P socket (female terminals) No. 4:

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

Is there battery voltage?

YES

Go to step 7.

Go to step 6.

Open wire check (M RLY line)

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

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

- 3. Disconnect the following connector.

PCM connector A (50P)

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

Test condition	Vehicle OFF (LOCK) mode
	Injector relay: disconnected
	PCM connector A (50P): disconnected
Test point 1	Injector relay 4P socket (female terminals) No. 4:
Test point 2	PCM connector A (50P) No. 22 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)

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

Is there continuity?

YES

The M RLY 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), or PCM Removal and Installation (6-Speed A/T), ('16-'18 9-Speed A/T)

If DTC P2623 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021), or PCM Removal and Installation (6-Speed A/T), ('16-'18 9-Speed A/T) .

Repair an open in the M RLY wire between the PCM (A22) and the injector relay.

Open wire check (INJ RLY OUT line)

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

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

- 3. Disconnect the following connector.

PCM connector A (50P)

- 4. Connect terminals A and B with a jumper wire.

Terminal A	Injector relay 4P socket (female terminals) No. 1:
Terminal B	Injector relay 4P socket (female terminals) No. 2:

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

- 5. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Injector relay: disconnected
	PCM connector A (50P): disconnected
	Injector relay 4P socket No. 1 and No. 2: jumped
Test point 1	PCM connector A (50P) No. 1 and No. 8 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
Test point 2	Body ground

Is there battery voltage?

YES

The INJ RLY OUT wires are OK. Go to step 8.

Repair an open in the INJ RLY OUT wire between the PCM (A1, A8) and the injector relay.

Open wire check (HP+B1/FP+B1 line, HP-B1/FP-B1 line)

- 1. Remove the jumper wire from the injector relay 4P socket as needed.

- 2. Reinstall the injector relay.

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

- 4. Disconnect the following connector.

PCM connector E (80P)

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

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
Test point 1	PCM connector E (80P) No. 1 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
Test point 2	PCM connector E (80P) No. 14 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)

Is there continuity?

YES

The HP+B1/FP+B1 wire and the HP-B1/FP-B1 wire are not open. Go to step 11.

Go to step 9.

Open wire check (HP+B1/FP+B1 line)

- 1. Disconnect the following connector.

High pressure fuel pump 2P connector

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

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
	High pressure fuel pump 2P connector: disconnected
Test point 1	High pressure fuel pump 2P connector (female terminals) No. 1:
Test point 2	PCM connector E (80P) No. 14 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)

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

Is there continuity?

YES

The HP+B1/FP+B1 wire is not open. Go to step 10.

Repair an open in the HP+B1/FP+B1 wire between the PCM (E14) and the high pressure fuel pump.

Open wire check (HP-B1/FP-B1 line)

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

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
	High pressure fuel pump 2P connector: disconnected
Test point 1	High pressure fuel pump 2P connector (female terminals) No. 2:
Test point 2	PCM connector E (80P) No. 1 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T)

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

Is there continuity?

YES

The HP-B1/FP-B1 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 (6-Speed A/T), ('16-'18 9-Speed A/T), or PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)

Repair an open in the HP-B1/FP-B1 wire between the PCM (E1) and the high pressure fuel pump.

Shorted wire check (HP+B1/FP+B1 line to power)

- 1. Disconnect the following connector.

High pressure fuel pump 2P connector

- 2. Turn the vehicle to the ON mode.

- 3. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
	High pressure fuel pump 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 14 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T)
Test point 2	Body ground

Is there any voltage?

YES

Repair a short to power in the HP+B1/FP+B1 wire between the PCM (E14) and the high pressure fuel pump.

Go to step 12.

Shorted wire check (HP-B1/FP-B1 line to power)

- 1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
	High pressure fuel pump 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 1 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T)
Test point 2	Body ground

Is there any voltage?

YES

Repair a short to power in the HP-B1/FP-B1 wire between the PCM (E1) and the high pressure fuel pump.

Go to step 13.

Shorted wire check (HP+B1/FP+B1 line to ground)

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

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

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
	High pressure fuel pump 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 14 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
Test point 2	Body ground

Is there continuity?

YES

Repair a short to ground in the HP+B1/FP+B1 wire between the PCM (E14) and the high pressure fuel pump.

The HP+B1/FP+B1 wire is OK. Go to step 14.

Shorted wire check (HP-B1/FP-B1 line to ground)

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

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected (if already done)
	PCM connector E (80P): disconnected
	High pressure fuel pump 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 1 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or PCM Connector for Inputs and Outputs (6-Speed A/T), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
Test point 2	Body ground

Is there continuity?

YES

Repair a short to ground in the HP-B1/FP-B1 wire between the PCM (E1) and the high pressure fuel pump.

The HP-B1/FP-B1 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 (6-Speed A/T), ('16-'18 9-Speed A/T), or PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)