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IMPORTANT - All
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© 2021 Subaru of America, Inc. All rights reserved.

SERVICE BULLETIN
APPLICABILITY:

2019-21MY Crosstrek PHEV

NUMBER: 09-82-23

SUBJECT:

DTC P0452 EVAP System (CPC) Pressure
Sensor/Switch Circuit Low
Design Changes to Fuel Tank Assembly & Vent Tubes

DATE: 10/02/23

INTRODUCTION:
This bulletin announces design changes made to the fuel tank and vent tubes. An enhanced material
has been incorporated into the production of these components. If DTC P0452 is stored in the
engine control module (ECM), the information in this bulletin MUST be used to ensure an accurate
diagnosis. Fuel types with high alcohol (ethanol) content may react with the fuel tank resin and cause
clogging within the fuel tank components. The new fuel tank and vent tubes use a material with
increased resistance to alcohol.
PRODUCTION CHANGE INFORMATION:
The production change information for Crosstrek PHEV is TBD.
PART INFORMATION:
Electronic Vent Solenoid
420FL380

Fuel Tank Assembly
42012FL061

Vent Tube #1
42074FL791

Vent Tube #2
42074FL801
Circulate Tube
42074FL730

CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD
RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS.
Subaru Service Bulletins are intended for use by professional technicians ONLY. They
are written to inform those technicians of conditions that may occur in some vehicles,
or to provide information that could assist in the proper servicing of the vehicle. Properly
trained technicians have the equipment, tools, safety instructions, and know-how to
do the job correctly and safely. If a condition is described, DO NOT assume that this
Service Bulletin applies to your vehicle, or that your vehicle will have that condition.

Subaru of America, Inc. is
ISO 14001 Compliant
ISO 14001 is the international standard for
excellence in Environmental Management
Systems. Please recycle or dispose of
automotive products in a manner that is friendly
to our environment and in accordance with all
local, state and federal laws and regulations.

Continued...
Bulletin Number: 09-82-23; Date: 10/02/23

Page 1 of 5

IMPORTANT NOTE: No design changes were made to the Circulate Tube or the Electronic Vent
Solenoid.
Part Description

Part Number

TANK COMPLETE-FUEL

42012FL061

TUBE-AIR VENT

42074FL791

TUBE-AIR VENT

42074FL801

TUBE ASSEMBLY

42074FL730

VALVE-VENT

42084FL380

REMINDER: Always order the most up-to-date replacement parts based on the specific VIN being
repaired.
SERVICE PROCEDURE / INFORMATION:
REMINDER: Customer satisfaction and retention starts with performing quality repairs.
NOTE: Refer to the applicable Service Manual and review: General Description > Repair Contents
> Action required before & after Battery Disconnect. Additionally, record any stored seat position(s)
before proceeding. Relearn any seat position memory after work is complete. If the power rear gate
(PRG) height has been customized, that position must also be noted and relearned.
STEP 1)

Perform a fault scan and confirm DTC P0452 is stored in the ECM.

STEP 2)

Check the data monitor. Is the value of the Fuel Tank Pressure Sensor -2.65kPa (-19.88
mmHg, -0.78inHg) or less?
No

With DTC P0452 detected, the circuit has returned to a normal condition at
this time. Reproduce the fault and repeat diagnosis.

Yes

Check the Tank Pressure Sensor power supply for short to ground (see wiring
diagram provided below).
Connector & Terminal (AD93) No. 3 (+) – Chassis Ground (-):
Is the voltage 4.5 Volts or more?

STEP 3)

No

Repair the harness and/or the connector.

Yes

Proceed to the next Step.

Check the harness between the ECM and the Fuel Tank Pressure Sensor for short to
ground.
Connector & Terminal (B134) No. 59 (+) – Chassis Ground (-):
Is the resistance 1 MΩ or more?
No

Repair the short to ground within the harness between the ECM and the Fuel
Tank Pressure Sensor.

Yes

Proceed to the next Step.
Continued...

Bulletin Number: 09-82-23; Date: 10/02/23

Page 2 of 5

STEP 4) Check for poor contacts. Is there a poor contact found within the Fuel Tank Pressure
Sensor Connector?
No

Yes

STEP 5)

Replace the Circulate Tube Assembly. Refer to the applicable Service Manual:
ENGINE > FUEL INECTION (FUEL SYSTEMS)(H4DO)(HEV)) > Circulate
Tube Assembly.
Proceed to the next Step.

Check the Fuel Tank Pressure Sensor Signal.
Connector & Terminal (AD94) No. 2 (+) – Chassis Ground (-):
Is the voltage 2.2V or more?

STEP 6)

No

Replaced the Circulate Tube Assembly.

Yes

Proceed to the next Step.

Perform Electronic Vent Solenoid inspection.
Refer to the applicable Service Manual: Engine > EMISSION CONTROL (AUX.
EMISSION CONTROL DEVICES)(H4DO(HEV)) > Electric Vent Solenoid Valve
Assembly > Inspection.
Is the resistance between terminal 1 & 2 approximately 34Ω and all the connections
secure?
No

Replace the Electronic Vent Solenoid:

Refer to the applicable Service Manual: Engine > EMISSION CONTROL (AUX.
EMISSION CONTROL DEVICES)(H4DO(HEV)) > Electric Vent Solenoid Valve
Assembly.
Visually inspect the internal condition of the Evaporative Line connections to the
Electronic Vent Solenoid:
1. Resin Tube on the Fuel Tank Assembly (attached directly to the Vent Solenoid)
2. Vent Tube #1
3. Vent Tube #2
If any deposits/build-up is found inside the tube(s), replace all the Vent Tubes and Fuel
Tank Assembly.
Yes

STEP 7)

Proceed to the next Step.

Inspect the evaporative system lines, hoses, and tubes for any deformation, cracks, or any
other physical damage. Replace any affected items as necessary.
Continued...

Bulletin Number: 09-82-23; Date: 10/02/23

Page 3 of 5

IMPORTANT NOTE: Whenever reconnecting the ground cable terminal to the battery sensor,
torque to 7.5Nm (5.5ft.-lbs. or 66inch-lbs.) while supporting the sensor with the other hand as
outlined in the applicable Service Manual under: STARTING/CHARGING SYSTSEMS > Battery
Sensor.

Wiring Diagram:

Continued...
Bulletin Number: 09-82-23; Date: 10/02/23

Page 4 of 5

WARRANTY / CLAIM INFORMATION:
For vehicles within the Basic New Car Limited Warranty period, this repair may be submitted using
the following claim information:
Labor Description

Labor Operation #

Labor Time

Fail Code

FUEL TANK, VENT SOLENOID AND TUBES R&R

B469-202

3.0

DBB22

EVAPORATIVE SYSTEM PRESSURE DIAGNOSIS

C458-001

1.2

EVAPORATIVE CANISTER TUBE R&R (TUBE 1 AND 2)

B461-402

0.4

HDO22

FUEL TANK R&R

B469-201

1.8

DBB22

For vehicles registered in Cal ZEV states TZEV warranty is available.
IMPORTANT REMINDERS:
•

SOA strongly discourages the printing and/or local storage of service information as
previously released information and electronic publications may be updated at any time.

•

Always check for any open recalls or campaigns anytime a vehicle is in for servicing.

•

Always refer to STIS for the latest service information before performing any repairs.

Bulletin Number: 09-82-23; Date: 10/02/23

Page 5 of 5