DTC Advanced Diagnostics: P2623 (2.0L Engine) (2024 2025)

DTC P2623  : High Pressure Fuel Pump Spill Valve Malfunction

General Description 

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

The powertrain control module (PCM) monitors the high pressure fuel pump for diagnosis of electric circuit. If the PCM detects abnormal in high pressure fuel pump circuit, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	-
DTC Type	One drive cycle, MIL on

Enable Conditions 

Condition	Minimum	Maximum
Engine speed [Engine Speed]	80 rpm	-
12 volt battery voltage [Battery]	8 V	16 V

[ ]: HDS Parameter

Malfunction Threshold 

Either of the conditions occurs:

Open circuit 

• The voltage difference between high side (HPUMP_H) and ground is more than 3.0 V.
• The voltage difference between low side (HPUMP_L) and ground is less than 1.5 V.

Short circuit in HPUMP_H line (Either malfunction threshold A or B) 

• Malfunction threshold A
• • -

    The voltage difference between power and high side (HPUMP_H) is more than 1.5 V.

  • -

    The voltage difference between high side (HPUMP_H) and ground is less than 3.0 V.

  • -

    The voltage difference between low side (HPUMP_L) and ground is less than 1.5 V.

  • -

    There is no short to ground at low side (HPUMP_L) in result of pinpointing.

• Malfunction threshold B
• • -

    The voltage difference between power and high side (HPUMP_H) is less than 1.5 V.

  • -

    The voltage difference between high side (HPUMP_H) and ground is more than 3.0 V.

  • -

    The voltage difference between low side (HPUMP_L) and ground is more than 1.5 V.

  • -

    There is no short to power at low side (HPUMP_L) in result of pinpointing.

Short circuit in HPUMP_L line (Either malfunction threshold A or B) 

• Malfunction threshold A
• • -

    The voltage difference between power and high side (HPUMP_H) is more than 1.5 V.

  • -

    The voltage difference between high side (HPUMP_H) and ground is less than 3.0 V.

  • -

    The voltage difference between low side (HPUMP_L) and ground is less than 1.5 V.

  • -

    The voltage difference between low side (HPUMP_L) and ground is less than 3.5 V during pinpointing.

• Malfunction threshold B
• • -

    The voltage difference between power and high side (HPUMP_H) is less than 1.5 V.

  • -

    The voltage difference between high side (HPUMP_H) and ground is more than 3.0 V.

  • -

    The voltage difference between low side (HPUMP_L) and ground is more than 1.5 V.

  • -

    The low side (HPUMP_L) current is more than 2.35 A during pinpointing.

HPUMP_H line short to HPUMP_L line (Either malfunction threshold A or B) 

• Malfunction threshold A
• • -

    The low side (HPUMP_L) current is more than 4.8 - 6.32 A during the beginning of actuation.

• Malfunction threshold B
• • -

    Abort of previous actuation due to short circuit.

  • -

    The voltage difference between power and high side (HPUMP_H) is more than 1.5 V.

  • -

    The voltage difference between low side (HPUMP_L) and ground is more than 1.5 V.

  • -

    The low side (HPUMP_L) current is more than 2.35 A during pinpointing.

Possible Cause 

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory.

Conditions for clearing the DTC 

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.