GROUP

NUMBER

FUEL SYSTEMS

Technical Service Bulletin

DATE

25-FL-002H
MODEL(S)

FEBRUARY 2025

SEE BELOW

HIGH PRESSURE FUEL PUMP REPLACEMENT
(WARRANTY EXTENSION Z04)

SUBJECT:

Description: Certain 2019-2022MY Veloster N (JSN), 2022-2023MY Elantra N (CN7N), and
2022-2023MY Kona N (OSN) vehicles are equipped with high pressure fuel pump (HPFP) assemblies
that have fuel control valves (FCV) that could allow excess fuel to enter the fuel pump due to gradual
wear of the FCV plunger. An air/fuel mixture that runs too “rich” may result in a reduction or loss of
motive power at low speeds. The vehicle will also have Diagnostic Trouble Code (DTC) P0088.
Hyundai is extending warranty coverage for the HPFP under this condition to 15 years or 150,000 miles
from the date of original retail delivery or date of first use (whichever occurs first) and is valid for original
and subsequent owners.
Follow the service procedure in this TSB to replace the HPFP.
Applicable Vehicles (Certain):
• 2019-2022MY Veloster N (JSN) produced from 09/06/2018 – 08/18/2022
• 2022-2023MY Elantra N (CN7N) produced from 09/15/2021 – 11/23/2023
• 2022-2023MY Kona N (OSN) produced from 10/05/2021 – 04/25/2023

Parts Information:
Model
Veloster N
(JSN)
Elantra N
(CN7N)
Kona N
(OSN)

Part Name

Pump – High
Pressure Kit
35399-2G333QQH

Figure

Remarks
Pump – High Pressure
35320-2GHA1 (Figure 1: QTY 1)
Bolt – Pump
11235-06226K (Figure 2: QTY 2)
Pipe – High Pressure
35305-2GPD0 (Figure 3: QTY 1)
Pump Gasket
(*Figure 4: Transfer from old
and reuse. NOT included in kit.)

NOTE: Above parts are for high pressure fuel pump replacement, only if the vehicle has DTC P0088.
Please order the kit part number 35399-2G333QQH, not the individual parts.

SST Information:
Tool Name

Tool #

Torque Wrench
Socket

09314-3Q100

Figure

Remarks

For tightening the flare nuts on both
ends of the high pressure pipe.
NOTE 1: All dealers previously received this tool as part of the dealer's essential tool kit.
NOTE 2: Additional SST tools can be ordered through Snap-On at 1-855-763-9199 or
https://hyundaiessentialtools.com/.
NOTE 3: If further assistance is required, please contact [email protected].
Inspection and Service Procedure Overview:

Warranty Information:
Model

Op. Code

Operation

Op.
Time

Casual Part

Nature
Code

Cause
Code

I14

ZZ3

Veloster N
(JSN)
Elantra N
(CN7N)

40D153R0

DTC P0088 Inspection and
0.8 M/H 35320-2GHA1
HPFP Replacement

Kona N
(OSN)
NOTE 1: If the affected parts are within the extended period of 15 years or 150,000 miles then submit
as a campaign claim type.
NOTE 2: If a part that is not covered by this TSB is found in need of replacement while performing
Z04 and the affected part is still under warranty, submit a separate claim using the same repair order.
If the affected part is out of warranty, submit a Prior Approval request for goodwill consideration prior
to performing the work.
NOTE 3: The incident parts are subject to callback through the normal Warranty Technical Center
(WTC) parts return process. Claim is subject to debit if the part is not returned.
Service Procedure:

NOTICE
Applying the recommended torque to all fasteners is essential to reduce potential issues from
occurring after the service procedure.
1.

Using a GDS scan tool, inspect to confirm if vehicle has DTC P0088 (or P008800).
•

If vehicle has DTC P0088/P008800, continue with the steps below to replace the
high pressure fuel pump.

•

If vehicles does NOT have DTC P0088/P008800, this TSB does NOT apply. Continue
with normal diagnosis.

i

Information

If dealer attempts to order the high pressure fuel pump kit and there is no corresponding
DTC P0088/P008800 found, the order will be subject to cancellation.

2.

Verify that Recall 262 has been completed previously.
•

Verify ECU Update Event #1141, 1152, and 1153 (depending on model) have been
completed.

•

If Recall 262 has NOT been performed, this TSB does NOT apply.
o Follow the service procedure listed in Recall 262 (TSB 24-01-075H-1 or latest
version) to resolve the DTC P0088 (or P008800) concern.

3.

Refer to the shop manual to release the residual fuel pressure in the fuel line:
•

Engine Control / Fuel System > Fuel Delivery System > Repair Procedures > Release
Residual Pressure in Fuel Line

i

Information

When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete
the code with the diagnostic tool afterwards.
4.

Record all radio presets and disconnect the battery negative (−) terminal.

5.

Refer to the shop manual to remove the high pressure pipe and high pressure fuel pump.
• Engine Control / Fuel System > Fuel Delivery System > High Pressure Fuel Pump

6.

Refer to the shop manual to complete the
installation of the new high pressure fuel
pump, the new high pressure pipe, and all
related parts.

i

B

Information

Be sure to transfer the shim-type metal
pump gasket (A) and the low pressure fuel
hose quick connector clamp (B) (if
equipped) over to the new High Pressure
Fuel Pump.
7.

A

Tighten the high pressure fuel components to the following specifications:
High Pressure Fuel Pump Bolt
Tightening Torque:

High Pressure Fuel Pipe
Tightening Torque:

lb-ft

11

lb-ft

24

N.m

14

N.m

33

(Use SST 09314-3Q100 or equivalent)
8.

Start the engine to confirm proper operation of the vehicle.

9.

The service procedure is now complete.