18NA246

Service Bulletin
Bulletin No.:
18-NA-246
Date:
June, 2019
TECHNICAL
Subject:
Malfunction Indicator Lamp (MIL) Illuminated - DTC P0172 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.
Some technicians may find DTC P0172 (Fuel Trim System Rich) set in the Engine
Control Module (ECM).
Cause
This condition may be caused by driving the vehicle in short intervals, allowing excessive
fuel to collect in the crankcase.
Correction
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.
Copyright 2019 General Motors LLC. All Rights Reserved.
Page 2
June, 2019
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
June, 2019
Page 3
For 2016-2018 Model Years:
Note: 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 12 V jumper or booster pack disconnected
from the AC voltage supply. DO NOT connect a battery
charger.
Program the ECM to the latest software available.
Refer to K20 Engine Control Module: Programming And
Setup in SI.
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.
Page 4
June, 2019
Bulletin No.: 18-NA-246
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).
Bulletin No.: 18-NA-246
June, 2019
Page 5
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
Causal
Part
Description
Part
Number
Qty
N/A
Filter, Oil
N/A
Oil
Refer
to EPC
1
N/A
VALVE, PCV
(Primary)
55596783
1
Warranty Information
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.
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.
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
2013-2019 Model Years:
Add
Traverse
4.0 hrs
Note: An oil and filter change is necessary to remove
excessive fuel collected in the crankcase and correct
the DTC set.
Camshaft Cover
Removal and Install
Add
Terrain
Camshaft Cover
Removal and Install
2.5 hrs
Add
All
Install Primary PCV
Valve
0.1 hr
5207717
4. Using hand pressure, install the new PCV valve
into the cover until seated into bore.
5. Install the camshaft cover.
1. Perform an oil change. Refer to Engine Oil and Oil
Filter Replacement in SI.
Labor
Time
Page 6
Labor
Operation
2886148*
June, 2019
Model
Description
All
Engine Control
Module
Reprogramming with
SPS for DTC
P0172 Set**
(Applies to 16MY,
17MY and 18MY only)
Bulletin No.: 18-NA-246
Labor
Time
0.3 hr
*This is a unique Labor Operation for Bulletin use only.
**To avoid warranty transaction rejections, the SPS
Warranty Claim Code must be entered when submitting this
transaction. When more than one Warranty Claim Code is
generated for a control module programming event, it is
required to document all Warranty Claim Codes in the
Correction field on the Job Card. Dealers must only enter
one code in the “SPS Warranty Claim Code” field on the
transaction, otherwise the transaction will reject.
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 SPS
system as follows:
• Open TIS on the computer used to program the
vehicle.
• Select and start SPS.
• 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
6
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.
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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