NHTSA ID Number: 10192039
Manufacturer Communication Number: 21NA074
Summary
This technical bulletin provides a procedure to replace the charge air cooler due to moisture getting inside of it and causing a malfunction indicator lamp illuminated with DTC P0300 and/or P0299/P2227.
5 Affected Products
Vehicle
| MAKE | MODEL | YEAR |
BUICK | ENVISION | 2016-2020 |
Condition
Some customers may comment on the Malfunction Indicator Lamp illuminated on Driver Information Center (DIC) or a reduced power complaint.
Technicians may find one or more of the following DTCs set.
• P0300 – Engine Misfire Detected
• P0299 – Engine Underboost
• P2227 – Barometric Pressure (BARO) Sensor Performance
Cause
This condition may be caused by a moisture build up inside the charge air cooler (CAC). This condition is more likely on the smaller displacement engines where an air-to-air charge air cooler is used.
In cold temperatures, ambient and PCV moisture can freeze in the charge air cooler, restricting flow, and causing DTC P0299 and/or P2227, or P0300.
In humid / rainy conditions, ambient moisture can build up in the charge air cooler, and on a subsequent acceleration be drawn into the engine setting a P0300 and possible stumble or sag.
Correction
Perform a smoke leak test of the charge air cooler, then follow the repair steps in the appropriate Service Procedure below, depending on the build date.
Parts Information
| Description | Part Number | Qty |
| Charge Air Cooler | 84634949 | 1 |
| BAFFLE, RAD AIR LWR | 23350091 |
SEOCONTENT-START
Service Bulletin Bulletin No.: 21-NA-074
Date: March, 2021
TECHNICAL
Subject: Malfunction Indicator Lamp Illuminated On Driver Information Center (DIC) with DTC
P0300 and/or P0299/P2227 Set
Brand: Model:
Model Year: VIN: Engine: Transmission:
from to from to
Buick Envision 2016 2020 – –
Equipped
with 2.0L
Engine
(RPO LTG)
All
Involved Region or Country United States, Canada
Condition
Some customers may comment on the Malfunction Indicator Lamp illuminated on Driver
Information Center (DIC) or a reduced power complaint.
Technicians may find one or more of the following DTCs set.
• P0300 – Engine Misfire Detected
• P0299 – Engine Underboost
• P2227 – Barometric Pressure (BARO) Sensor Performance
Cause
This condition may be caused by a moisture build up inside the charge air cooler (CAC).
This condition is more likely on the smaller displacement engines where an air-to-air
charge air cooler is used.
In cold temperatures, ambient and PCV moisture can freeze in the charge air cooler,
restricting flow, and causing DTC P0299 and/or P2227, or P0300.
In humid / rainy conditions, ambient moisture can build up in the charge air cooler, and on
a subsequent acceleration be drawn into the engine setting a P0300 and possible
stumble or sag.
Correction Perform a smoke leak test of the charge air cooler, then follow the repair steps in the
appropriate Service Procedure below, depending on the build date.
Important: DO NOT replace the CAC inlet or outlet
ducts as part of this repair unless there is evidence of
damage and/or a leak from either CAC duct.
Service Procedure – Charge Air Cooler
Diagnosis
Important: Remove the boost sensor and wipe with a
clean rag to remove residual moisture to ensure the
sensor is not contaminated. DO NOT use chemical
cleaners.
1. Perform a smoke leak test of the charge air cooler,
using essential tool GE-52250 Power Smoke
Diagnostic Leak Detector. Refer to Chart Based
Conditions, below, for next steps.
Page 2 March, 2021 Bulletin No.: 21-NA-074
5779438
Important: The latest designed charge air cooler is
wider, as shown in the picture above, and is NOT
compatible with the existing lower baffle on vehicles
built BEFORE January 5, 2019. The baffle will need to
be replaced to accommodate the larger charge air
cooler if the charge air cooler is being replaced
Chart Based Conditions
Model
Years Condition
REPLACE
Charge Air
Cooler –
(CAC) Refer
to Charge
Air Cooler
Replacement
in SI
Repair Other
System Issue
2016-
2020 CAC Leaking X –
2016-
2019
CAC Frozen
(Built Before
January 5,
2019) *
X –
2019-
2020
CAC Frozen
(Built After
January
5, 2019)
Thaw, clean
and
reinstall CAC
Refer to SI
2016-
2020
CAC Frozen
AND Leaking X –
Chart Based Conditions
Model
Years Condition
REPLACE
Charge Air
Cooler –
(CAC) Refer
to Charge
Air Cooler
Replacement
in SI
Repair Other
System Issue
2016-
2020
CAC Not
Frozen OR
Leaking and
no P0300
– Refer to SI
2016-
2019
CAC Not
Frozen OR
Leaking P0300
from driving in
humid/rainy
conditions
(Built Before
January 5,
2019) *
X –
2016-
2019
CAC Not
Frozen OR
Leaking P0300
from driving in
humid/rainy
conditions
(Built After
January 5,
2019) *
– Refer to SI
Note: Replacement of the Charge Air Cooler is ONLY
required if GM IVH (View Vehicle Build) indicated build date
is Before January 5, 2019 AND GM IVH (View Transaction
History Detail) indicates the CAC has not been previously
replaced, or the part is damaged or leaking.
Parts Information
Causal
Part
Description Part
Number
Qty
X Charge Air Cooler 84634949
N/A* BAFFLE, RAD 1
AIR LWR
23350091
*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.
Bulletin No.: 21-NA-074 March, 2021 Page 3
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.
Labor Operation Description Labor Time
4087008* Perform Smoke Test for Charge Air Cooler and Charge Air
Cooler Replacement
2.3 hrs. (Envision)
*This is a unique Labor Operation for Bulletin use only.
Version 1
Modified Released March 24, 2021
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-074
Date: March, 2021
MC-10192039-9999.pdf 999.169KB
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