18-NA-246

Bulletin No.:
Service Bulletin
Date:
18-NA-246
March, 2022
TECHNICAL
Subject:
Malfunction Indicator Lamp (MIL) Illuminated - DTC P0172, P06DE and/or P0521 Set
(North America Vehicles Only)
Attention: This bulletin applies to the vehicles that have fuel enriched engine oil due to short
driving intervals.
Brand:
Buick
Cadillac
Chevrolet
GMC
Model:
Model Year:
from
Envision
2016
Regal
2014
ATS
2013
CTS
2014
Camaro
2016
Equinox
2018
Malibu
2013
Traverse
2018
Terrain
2018
to
2019
VIN or Build Date:
from
to
SOP
May 7, 2019
And Engine Unique
Number (EUN) before
T119127XHXTX0251
Engine:
Transmission:
Equipped with
2.0L (LTG)
Involved Region or Country
North America
Condition
Some customers may comment that the MIL is illuminated.
Technicians may find DTC P0172 (Fuel Trim System Rich) set in the Engine Control
Module (ECM).
Technicians may also find DTC P06DE and/or P0521 set.
Cause
Correction
Copyright 2022 General Motors LLC. All Rights Reserved.
This condition may be caused by driving the vehicle in short intervals, allowing excessive
fuel to collect in the crankcase.
Important: This service procedure is for vehicles that have fuel enriched engine oil due
to frequent short trip operation. Replacing fuel components such as the high pressure fuel
pump or fuel injectors will not correct the setting of P0172 under the operating conditions
described unless those components can be verified as causing a fuel rich condition.
If fuel in the engine oil has been confirmed to be caused by frequent short trip operation,
refer to the Service Procedure below.
Page 2
March, 2022
Bulletin No.: 18-NA-246
Service Procedure
Important: Perform all of the procedures below that
apply to the model year of the vehicle being worked on.
For 2019 Model Years:
5336568
Vehicles built after May 7, 2019 may already have the
updated PCV installed. Inspect the Engine Julian Date
by reviewing the EUN on the front engine cover.
Bulletin No.: 18-NA-246
March, 2022
•
5336723
Example Engine Unit Number:
– The first digit reflects the engine plant (in this case T
= Tonawanda).
– The second digit reflects the shift (in this case 1 =
First Shift).
– The third and fourth digits reflect the calender year
(in this case 18 = 2018).
– The fifth, sixth and seventh digits reflect the day of
that calendar year (in this case 162 = 162nd day of
2018 calendar year (build date)).
If the engine you are working on was built on or after
Julian Date 19127 (May 7, 2019), EUN# T119127
XHXTX0251, the PCV does not need to be replaced.
The new revised PCV is already installed in the
camshaft cover. Refer to SI for further diagnostics.
Engines built prior to Julian Date 19127 (May 7, 2019),
EUN# T119127 XHXTX0251, have the old style primary
PCV valve installed and will need to be replaced.
Continue with service procedure below.
For 2016-2018 Model Years:
Caution: Before downloading the update files, be sure
the computer is connected to the internet through a
network cable (hardwired). DO NOT DOWNLOAD or
install the files wirelessly. If there is an interruption
during programming, programming failure or control
module damage may occur.
Page 3
Ensure the programming tool is equipped with the
latest software and is securely connected to the
data link connector. If there is an interruption
during programming, programming failure or
control module damage may occur.
• Stable battery voltage is critical during
programming. Any fluctuation, spiking, over
voltage or loss of voltage will interrupt
programming. Install a GM Authorized
Programming Support Tool to maintain system
voltage. Refer to www.gmdesolutions.com for
further information. If not available, connect a fully
charged 12V jumper or booster pack disconnected
from the AC voltage supply. DO NOT connect a
battery charger.
• Follow the on-screen prompts regarding ignition
power mode, but ensure that anything that drains
excessive power (exterior lights, HVAC blower
motor, etc) is off.
• Please verify that the radio time and date are set
correctly before inserting USB drive into vehicle
for programming, otherwise an error will result.
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Important: The service technician always needs to
verify that the VIN displayed in the TLC left side drop
down menu and the top center window match the VIN
plate of the vehicle to be programmed prior to using
Service Programming System 2 (SPS2) for
programming or reprogramming a module.
• For the TLC application, service technicians need
to always ensure that the power mode (ignition) is
“ON” before reading the VIN from the vehicle’s
VIN master module and that they do not select a
VIN that is already in the TLC application memory
from a previous vehicle.
• If the VIN that shows up in the TLC top center
window after correctly reading the VIN from the
vehicle does not match the VIN plate of the
vehicle, manually type in the VIN characters from
the vehicle VIN plate into the TLC top center
window and use these for programming or
reprogramming the subject module with the
correct vehicle VIN and software and/or
calibrations.
• The Engine Control Module (ECM) is the master
module (for VIP vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the ECM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.
• The Body Control Module (BCM) is the master
module (for GEM vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the BCM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.
Page 4
March, 2022
Bulletin No.: 18-NA-246
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.
5743643
Important: If the vehicle VIN DOES NOT match, the
message below will be shown.
5877000
Bulletin No.: 18-NA-246
March, 2022
Page 5
5644477
Important: Techline Connect screen shown above.
Important: If the same calibration/software warning is
noted on the TLC or SPS Summary screen, select OK
and follow screen instructions. After a successful
programming event, the Warranty Claim Code (WCC) is
located in the Service Programming System dialogue
box of the SPS Summary screen. Document the WCC
on the job card. No further action is required. Refer to
the Warranty Information section of this bulletin.
1. Reprogram the ECM. Refer to K20 Engine Control
Module: Programming and Setup in the Service
Manual.
Page 6
March, 2022
Bulletin No.: 18-NA-246
5644478
Note: The screenshot above is an example of module
programming and may not be indicative of the specific
module that is being programmed. Module selection
and VIN information have been blacked out.
Important: To avoid warranty transaction rejections,
you MUST record the warranty claim code provided on
the Warranty Claim Code (WCC) screen shown above
on the job card. Refer to callout 1 above for the location
of the WCC on the screen.
2. Record the Warranty Claim Code on the job card
for warranty transaction submission.
Bulletin No.: 18-NA-246
March, 2022
Page 7
For 2016-2019 Model Years:
5207126
Note: The graphic above compares the old style
primary PCV valve (A) to the new revised PCV
valve (B).
4244907
1. Remove the camshaft cover (3). Refer to Camshaft
Cover Replacement in SI.
2. Remove the old style PCV valve from the cover
and discard.
3. Apply a light coating of oil to the new revised PCV
valve O-ring.
Page 8
March, 2022
Bulletin No.: 18-NA-246
Labor
Operation
Model
Description
4086338*
All
Diagnose MIL and
Clear Code
0.2 hr
Add
All
Oil and Filter Change
0.3 hr
Add
Envision
Camshaft Cover
Removal and Install
2.5 hrs
Add
Regal
Camshaft Cover
Removal and Install
1.5 hrs
Add
ATS
Camshaft Cover
Removal and Install
3.9 hrs
Add
CTS
Camshaft Cover
Removal and Install
3.7 hrs
Add
Camaro
Camshaft Cover
Removal and Install
3.9 hrs
Add
Equinox
Camshaft Cover
Removal and Install
2.5 hrs
Add
Malibu
Camshaft Cover
Removal and Install
3.6 hrs
Add
Traverse
Camshaft Cover
Removal and Install
4.0 hrs
Add
Terrain
Camshaft Cover
Removal and Install
2.5 hrs
Add
All
Install Primary
PCV Valve
0.1 hr
All
Engine Control
Module
Reprogramming with
SPS for DTC
P0172 Set**
(Applies to 16MY,
17MY and 18MY only)
0.3 hr
5207717
4. Using hand pressure, install the new PCV valve
into the cover until seated into bore.
5. Install the camshaft cover.
2013-2019 Model Years:
Note: An oil and filter change is necessary to remove
excessive fuel collected in the crankcase and correct
the DTC set.
1. Perform an oil change. Refer to Engine Oil and Oil
Filter Replacement in the Service Manual.
2. Clear the code and take the vehicle for a test drive
to validate that the code does not return.
Important: If the customer continues to frequently
operate the vehicle in this manner, they MUST change
the engine oil and filter more frequently than the oil life
monitor indicates. How often the customer must
change the engine oil is based on how they operate the
vehicle.
Parts Information
*This is a unique Labor Operation for bulletin use only.
Causal
Part
Description
Part
Number
Refer
to EPC
1
55596783
1
N/A
Filter, Oil
N/A
Oil
N/A
VALVE, PCV
(Primary)
2886148*
Labor
Time
Qty
Warranty Information
Important: Only select the labor operation that
coincides with the repair performed.
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.
Important: **To avoid warranty transaction rejections,
carefully read and follow the instructions below:
• The Warranty Claim Code must be accurately entered
in the “SPS Warranty Claim Code” field of the
transaction.
• When more than one Warranty Claim Code is
generated for a programming event, it is required to
document all Warranty Claim Codes in the “Correction”
field on the job card. Dealers must also enter one of the
codes in the “SPS Warranty Claim Code” field of the
transaction, otherwise the transaction will reject. It is
best practice to enter the FINAL code provided by
SPS/SPS2.
Bulletin No.: 18-NA-246
March, 2022
Page 9
Warranty Claim Code Information Retrieval
If the SPS Warranty Claim Code was not recorded on
the Job Card, the code can be retrieved in the SPS2
system as follows:
• Open TLC on the computer used to program the
vehicle.
• Select and start SPS2.
• Select Settings.
• Select the Warranty Claim Code tab.
The VIN, Warranty Claim Code and Date/Time will be
listed on a roster of recent programming events. If the
code is retrievable, dealers should resubmit the
transaction making sure to include the code in the SPS
Warranty Claim Code field.
Version
7
Modified
Released August 06, 2018
January 30, 2019 – Added an Attention statement, updated the Models section,
Correction, Service Procedure and Parts and Warranty Information.
February 14, 2019 – New Labor Operation number requested for ECM programming
under Warranty Information section.
March 19, 2019 – Updated the Envision, Equinox and Terrain Labor Times.
March 28, 2019 – Added NEW and DISCARD to steps 2, 3 and 4 under For 2016-2019
Model Years: of the Service Procedure.
May 29, 2019 – Added Build Date/EUN Breakpoint information to Models, added For
2019 Model Years section to the Service Procedure, added Model Year descriptions to
the two Labor Operation Numbers, changed the Labor Time for Engine Control Module
Reprogramming with SPS and added SPS Warranty Claim Code information.
March 11, 2022 – Added DTC P06DE and/or P0521 to Subject and Condition section and
updated the Service Procedure programming steps.
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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