Refer to SI

-

-

X

Remove Front
Bumper
Secondary
(lower) Shutter

Install Front
Bumper
Lower (CAC)
Shutter,
instructions
below

Install Soft Grill
Cover Over
Lower Grill
Opening***

Repair Other
System Issue

-

-

-

Bulletin No.: 18-NA-020

October, 2023

Page 5

Chart Based Conditions

Model
Years

Condition

Replace
Charge Air
Cooler – (CAC)
Refer to Charge
Air Cooler
Replacement
on SI.

Remove Front
Bumper
Secondary
(lower) Shutter

Install Front
Bumper
Lower (CAC)
Shutter,
instructions
below

Install Soft Grill
Cover Over
Lower Grill
Opening***

Repair Other
System Issue

Note: The Engine Control Module calibration should be updated (LYX/LSD ONLY). The new calibration will enable a revised
transmission shift pattern during cold weather operation which does not use overdrive as frequently. As a result, some customers
may notice elevated engine RPM’s during highway operation. This operating mode will reduce the potential for ice to build up
inside the charge air cooler, and the potential for setting P0299 or P0234 diagnostic codes. The customer must be informed by
dealership personnel by explaining the new engine control module calibration and its effect on transmission shift patterns at
highway speeds during cold weather to avoid a customer return to the dealership after programming is completed.
Note: Replacement of the Charge Air Cooler is ONLY required if GM IVH (View Vehicle Build) indicated build date is before 03/
01/2018 AND GM IVH (View Transaction History Detail) indicates the CAC has not been previously replaced.
** Remove Soft Grill Cover Over Lower Grill Opening when temperatures are consistently averaging 32F/0C or above.

5775941

*** For Terrains with front license plate bracket (VK3), install tape over the openings on bottom of the license plate bracket, to
prevent airflow from bypassing the grill cover and flowing directly at the charge air cooler, as shown in the picture above.

Page 6

October, 2023

Bulletin No.: 18-NA-020

Examples of the Differences Between the Shutter
Systems

5736482

•
•

Front Bumper Upper Shutter with the Front
Bumper Secondary (lower) Shutter attached (1),
as shown in the picture above.
Front Bumper Lower Shutter that mounts in the
front of Charge Air Cooler (2), as shown in the
picture above.

Service Procedure - Install Front
Bumper Lower (CAC) Shutter
Important: The Front Bumper Lower (CAC) Shutter is
a permanently retrofitted item. The added shutter is
activated to close and open based on temperature,
controlled by integral thermostatic springs.
Note: Advise the customer to keep the shutter clear of
debris, including leaves and insects. The shutter should
be periodically cleaned with a soapy water spray,
especially right before the cold weather season begins.
1. Remove the Front Bumper Upper Shutter for
modification. Refer to Front Bumper Shutter
Replacement in SI.
2. Remove and discard the front bumper secondary
(lower) shutter assembly from the upper shutter.
Refer to Front Bumper Secondary Shutter
Replacement in SI.
Note: The secondary (lower) shutter assembly will
NOT need to be reinstalled in the future.

5279924

3. On the back of the now removed upper shutter,
using a saw blade, cut the upper shutter to
secondary (lower) shutter actuator at the pivot
location, as shown in the picture above. Remove
the linkage (1) and discard.
4. Reinstall the upper shutter.

Bulletin No.: 18-NA-020

October, 2023

Page 7

5775942

5. Remove and discard the 4 Lower Air Baffle push-in
retainers (1), as shown in the picture above.

5775943

6. Locate Front Bumper Lower (CAC) Shutter in front
of the lower air baffle and install the new, longer
retainers, as shown in the picture above.
7. Continue reinstalling the parts that were removed
during disassembly as part of Front Bumper
Shutter Replacement in SI.

Page 8

October, 2023

Bulletin No.: 18-NA-020

Examples of the Grill Opening Covers (Installation
instructions included in the part packaging)

5776421

Shown in the picture above are examples of the grill
opening covers for the Equinox (1), Terrain without
(RPO VK3) (2) and Terrain with (RPO VK3) (3).

Bulletin No.: 18-NA-020

October, 2023

Page 9

Parts Information
Causal
Part

Description

X

Charge Air Cooler

Causal Part

Part
Number

RPO

85163204

LYXLSD

85163205

LTG

Des- cription

Part Number

RPO

2018-2021 84624274 (Equinox)

Without WBL or WFP

2018-2021 84624275 (Equinox
with Redline/Sport or accessory
grill PDV)

With WBL or WFP or accessory
grill PDV

2018-2021 84630081 (Terrain
without front license plate bracket)

Without VK3

2018-2021 84648360 (Terrain with
front license plate bracket)

With VK3

2022-2024 85551501 (Equinox,
except RS)

Without B8G

2022-2024 85551504
(Equinox RS)

With B8G

2022-2024 85555139 (Terrain,
except Denali, with front license
plate bracket)

With VK3

2022-2024 85555142 (Terrain,
except Denali, without front license
plate bracket)

Without VK3

2022-2024 85576446 (Terrain
Denali, with license plate bracket)

With VK3

2022-2024 85576448 (Terrain
Denali, without front license plate
bracket)

Without VK3

COVER PKG-FRT
GRL OPG

NA*

2018-2021 85139401 (Equinox)
SHUTTER KIT - FRT
BPR LWR (CAC Shutter)

2018-2021 85139400 (Terrain)
2022-2024 85139402 (Equinox)
2022-2024 85139403 (Terrain)

RETAINER, FRT BPR
SHUTTER BFL

11589291 x 4

TCV THERMAL WRAP

25205589

*For warranty transactions, DO NOT mark this/these
parts as the Causal Part. Enter the word “Bulletin” in the
Causal Part Description free-flow text field.

LTG, LYX
LYX/LSD

2018-2022 LYX

Page 10

October, 2023

Bulletin No.: 18-NA-020

Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information, except ECM
reprogramming is covered for 8 years/80,000 miles
(U.S.) or 8 years/130,000 km (Canada).
Labor Operation

Description

Labor Time
2.3 hrs. (Equinox RPO LTG)

4087008*

Perform Smoke Test for Charge Air Cooler and Charge
Air Cooler Replacement

2.4 hrs. (Equinox RPO LYX/LSD)
2.6 hrs. (Terrain RPO LTG)
2.4 hrs. (Terrain RPO LYX/LSD)

Add

Cleaning and Reinstalling Charge Air Cooler if Frozen
and/or Contaminated

1.0 hrs. (Equinox, Terrain)

Add

Install Shutter Cover if also Replacing Charge Air Cooler

0.2 hrs. (Equinox, Terrain)

1086018*

Perform Smoke Test and Install Charge Air Cooler Grille
Cover

0.6 hrs. (Equinox)

4087308*

Perform Smoke Test for Charge Air Cooler and Install
Shutter Cover

1.3 hrs. (Equinox, Terrain)

Add

Engine Control Module Re-programming with SPS,
Removal of condensation from Turbocharger Wastegate
Regulator Solenoid Valve and Install Thermal Wrap

1.0 hrs. (Equinox, Terrain)

*This is a unique Labor Operation for Bulletin use only.

0.5 hrs. (Terrain)

Bulletin No.: 18-NA-020

October, 2023

Page 11

Version

23

Modified

Released January 22, 2018
Revised July 26, 2018 – Added Holden Equinox Model.
Revised October 19, 2018 – Updated the Cause and Correction.
Revised December 21, 2018 – Updated Additional Options, Correction, Parts Information
and Warranty Information.
Revised January 09, 2019 – Updated the Parts Information.
Revised February 19, 2019 – Added Envision also updated the Condition, Parts
Information and Warranty Information.
Revised March 19, 2019 – Updated the Service Procedure and Warranty Information for
Equinox/Terrain.
Revised May 15, 2019 – Updated the Warranty Information and adding flow chart.
Revised November 05, 2019 – Updated the Warranty Information.
Revised December 17, 2019 – Added 2020 Model Year.
Revised February 21, 2020 – Updated pictures for flow charts, also updated applicable
information within the bulletin including the Service Procedure Equinox/Terrain also Part
and Warranty Information.
Revised April 07, 2020 – Updated information for the following: Correction, Service
Procedure (Equinox/Terrain) and Warranty Information.
Revised February 11, 2021 – Added 2020-2021 Model Years for Equinox/Terrain, added
Examples of the Difference Between the Two Shutters information and updated
information under Service Procedure Equinox, Terrain.
Revised March 18, 2021 - Removed Buick Envision and updated applicable information
throughout the Bulletin.
Revised January 21, 2022 – Added 2022 Model Year and updated information under
Condition, Chart Based Conditions Table, Part Information and Warranty Information.
Revised January 28, 2022 – Updated the Warranty Coverage.
Revised February 10, 2022 – Updated information under Service Procedure - Charge Air
Cooler Diagnosis, Chart Based Conditions, Part Information and Warranty Information.
Revised May 24, 2022 – Updated information under Subject, Service Procedure - Charge
Air Cooler Diagnosis, Chart Based Conditions, Part and Warranty Information.
Revised August 25, 2022 – Added 2023 Model Year, RPO LSD and updated information
under Correction, note above the Service Procedure, Chart Based Conditions and Parts
Information.
Revised December 14, 2022 - Updated the Warranty Information.
Revised January 19, 2023 - Updated Note above Service Procedure - Charge Air Cooler
Diagnosis and information in Chart Based Conditions and Warranty Information.
Revised February 08, 2023 - Updated the Parts Information.
Revised October 19, 2023 - Added 2024 Model Year, Important Statement, and updated
the Chart Based Conditions.

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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