NHTSA ID Number: 11016945
Manufacturer Communication Number: 23-NA-073
TSB/Document Date: 2025-04-10
Summary
This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
Bulletin No.: 23-NA-073
Service Bulletin
Date: March, 2025
TECHNICAL
Subject:
Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion
into the Evaporative Canister and Canister Vent Solenoid
Important: This bulletin excludes Cab and Chassis (ZW9) vehicles.
Brand:
Model:
Model Year:
from
to
2019
2019
2020
2021
2022
2022
Silverado 1500
2023
2025
Silverado 2500 HD/
3500 HD
2020
2025
Sierra 1500 (New
Model)
2019
2019
Sierra 1500
2020
2021
2022
2022
Sierra 1500
2023
2025
Sierra 2500 HD/3500
HD
2020
2025
Silverado 1500 (New
Model - 12th VIN Digit
= 7) - 4WD
VIN:
from
All
All
to
Silverado 1500 (New
Model)
Silverado 1500
Chevrolet
Silverado 1500 LTD
(RPO J21, VIN Digit 5
= W/Y)
Silverado 1500 New
(RPO J22, VIN Digit 5
= A/D)
Sierra 1500 Limited
(RPO J21, VIN Digit 5
= 8/9)
Sierra 1500 New
(RPO J22, VIN Digit 5
= H/U)
Involved Region or Country
United States, Canada, Middle East, Israel
Condition
Some customers, who operate their vehicles in extremely dusty environments, may
experience dust intrusion into the EVAP system that can plug the canister and canister
vent solenoid and set DTC’s P0442, P0446, P0455 or P0449.
Cause
The condition may be caused the by the normal use of these vehicles operating in severe
dusty environments.
Correction
Important: This repair is a customer pay alteration. All repair, and payment authorization must come from the customer.
Copyright 2025 General Motors. All Rights Reserved.
Page 2
March, 2025
Bulletin No.: 23-NA-073
j
6325318
Note: The retro-fit to add the filter is described in the Service Procedure below. For
the retro-fit, the filter assembly P/N (with the 3 parts shown above) will need to be
utilized along with a 3/4" to 5/8" hose connector that can be obtain for a local parts
store. If a vehicle has already undergone the retro-fit and the vehicle returns after a
period of time with the Condition reappearing, the filter assembly can be changed.
Note: The filter is meant to be maintenance item that should be checked periodically to prevent the issue from reoccurring and the DTC from setting.
6327015
A filter may be installed between the EVAP canister and air inlet, to correct this Condition.
An example of the original, and the retro-fit, evaporative emission canister vent hose are
shown in the graphic above.
Service Procedure
Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws
applicable to the activities it performs under this bulletin, including but not limited to handling, deploying,
preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a
conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you
must follow those applicable laws.
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle, in SI.
Bulletin No.: 23-NA-073
March, 2025
Page 3
5041593
2. Remove the evaporative emission canister vent hose (3). Refer to the appropriate Evaporative Emission
Canister Vent Hose Replacement (Filler Pipe to Pipe), in SI.
6325322
3. Cut the vent hose at the end of barbed fitting on the pre filter (1).
Page 4
March, 2025
Bulletin No.: 23-NA-073
6325324
4. Cut a 12 inch (30.5 cm) length of 3/4 in. diameter heater core hose.
6325326
5. Using the length of the original black corrugated hose as a measurement, cut a length of 3/4 in. diameter heater
core hose the same appropriate length.
Bulletin No.: 23-NA-073
March, 2025
Page 5
6325328
6. Secure the 12 inch (30.5 cm) length heater core hose to the fitting on the pre filter (1), using a hose clamp.
7. Secure the in-line filter (2) to the other end of 12” (30.5 cm) length hose, using a hose clamp.
8. Secure the longer heater core hose to the fitting at bottom of in-line filter (3), using a hose clamp.
9. Insert 5/8” male to male fitting (4) into heater core hose on CVS side, using a hose clamp to secure.
5041593
Page 6
March, 2025
Bulletin No.: 23-NA-073
10. Connect 5/8” end of male fitting to the quick connect on the CVS jumper line and install the evaporative
emission canister vent hose (3), to the vehicle. Refer to the appropriate Evaporative Emission Canister Vent
Hose Replacement (Filler Pipe to Pipe), in SI.
6325329
6325331
11. Using existing hose clips, and tie straps, clip new hose at same location as previous line.
12. Lower the vehicle.
Bulletin No.: 23-NA-073
March, 2025
Page 7
Parts Information
Causal
Part
N/A
Description
Part
Number
Qty
FILTER ASMEVAP EMIS SYS
VAC LEAK PUMP
(ASSEMBLY)
86792068
1
FILTER ASMEVAP EMIS SYS
VAC LEAK PUMP
(FOAM FILTER)
86792069
1
Warranty Information
Important: This repair is not a warranty repair, but a customer pay alteration. All repair, and payment authorization must come from the customer.
Version
5
Modified
Released June 19, 2023.
Revised September 20, 2023 - Revised the Note Information to add a Hose Fitting in the
Correction section.
Revised February 26, 2024 - Added 2024 Model Year to Silverado/Sierra 1500.
Revised October 07, 2024 - Added 2025 Model Year to Silverado/Sierra 1500/2500.
Revised March 13, 2025 - Added Important statement at the Beginning of Bulletin.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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TSB/Document ID: 23-NA-073
Replacement Service Bulletin Number:
MFR Communication Date: 2025-03-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
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