20-NA-047

Bulletin No.:
Service Bulletin
Date:
20-NA-047
January, 2023
TECHNICAL
Subject:
Front or Rear Crankshaft Oil Leak, Malfunction Indicator Lamp (MIL) Illuminated - DTC
P1101 Set
This bulletin replaces PIP5417C. Please discard PIP5417C.
Brand:
Model:
Buick
Chevrolet
GMC
Model Year:
VIN:
from
to
Encore
2016
2022
1.4L
(RPO LE2)
Cruze
(Gen II VIN B)
2016
2019
1.4L
(RPO LE2)
Equinox
2018
2022
1.5L
(RPO LYX)
Malibu
2016
2022
Trax
2019
2022
1.4L
(RPO LE2)
Volt
2016
2019
1.5L
(RPO L3A)
Terrain
2018
2022
1.5L
(RPO LYX)
—
to
Engine:
from
—
1.5L
(RPO LFV)
Transmission:
—
Involved Region or Country
North America, China, Thailand, Middle East, Israel, Europe, Brazil, Chile, Colombia,
Peru, South Africa
Condition
Some customers may comment on one or more of the following conditions:
• Oil Leak
• MIL illuminated
Some technicians may find DTC P1101 (Intake Air Flow System Performance) set in the
Engine Control Module (ECM).
Cause
This condition may be caused by higher than normal crankcase pressures, due to a
plugged positive crankcase ventilation (PCV) orifice.
Correction
While performing Strategy Based Diagnostics for P1101 or engine oil leaks on the listed
engines, testing for excessively positive crankcase pressures is necessary for root cause
isolation.
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
January, 2023
Bulletin No.: 20-NA-047
Crankcase Pressure Test
Use the Evaporative Emissions System Tester (EEST)
to record the crankcase pressure.
Refer to the pictures below for connection of the EEST
at the engine oil dipstick port and related readings.
4573243
3416804
EEST hose adaptor
4573240
EEST Gage at 0 reading
Note: The connection must be made with the engine
off. The engine is then started and the pressure reading
is recorded.
Normal crankcase pressure readings for the L3A, LE2,
LFV and LYX are between -1 & -5 inches of water in
park at hot idle.
• If the crankcase pressure is in the proper range,
follow Strategy Based Diagnostics for engine oil
leaks and/or P1101 per SI.
• If the crankcase pressure is excessively positive,
above 0 inches of water (0 inches of HG /
vacuum), then a positive crankcase pressure
concern exists requiring further diagnostics.
Inspect for any air induction restrictions in the front air
intake duct to air cleaner housing or in the air cleaner
housing (nesting materials, water intrusion or ice
blockage, kinked PCV tube or modifications to the air
induction system).
Note: Refer to Service Bulletin #18-NA-171 or
19-NA-122 for conditions caused by cracked pistons.
These are usually accompanied with a P0300 and they
can cause higher crankcase pressures.
Bulletin No.: 20-NA-047
January, 2023
Camshaft Cover Inspection, Cleaning
and Orifice Replacement
Remove the camshaft cover and remove the PCV
orifice and inspect for blockage. Replace the orifice as
necessary along with the camshaft cover gaskets.
Make sure the camshaft cover does not have any
blockages in the PCV passages.
5513764
If diagnosing for oil leaks and/or DTC P1101 with no
engine oil leaks and excessive positive crankcase
pressure exists, an obstructed PCV orifice (1) would be
suspect requiring a PCV orifice replacement.
5519694
1. Remove the camshaft cover (1). Refer to Camshaft
Cover Replacement in SI.
2. Remove the PCV orifice (2) and inspect for
blockage.
3. Verify the camshaft cover does not have any
blockages in the PCV passages.
Page 3
4. Replace the orifice as necessary along with the
camshaft cover gaskets.
5. Install the camshaft cover.
Page 4
January, 2023
Bulletin No.: 20-NA-047
Parts Information
Causal Part
Vehicle
Description
Part Number
Qty
X
All
ORIFICE, PCV VLV
12641875
1
12636176
2
(Encore/Cruze/Malibu/
Trax/Volt)
N/A
All
GASKET, CM/SHF
POSN ACTR SOL VLV
1
(Equinox/Terrain)
N/A
All
GASKET, CM/SHF
CVR (OUTER)
12636177
N/A
All
GASKET, CM/SHF
CVR (INNER)
12636384
N/A
All
BOLT, F/INJR
55570735
N/A
Encore/Cruze/Malibu/
Trax/Equinox/Terrain
GASKET, VAC PUMP
12665421
N/A
Encore/Cruze/Malibu/
Trax/Equinox/Terrain
SEAL, VAC PUMP
12668429
N/A
Equinox/Terrain
GASKET, CM/SHF
POSN ACTR SOL VLV
12676587
PIPE, FUEL FEED
INTER
12684046
SEAL, F/INJN
FUEL RL
12659782
PIPE, FUEL FEED
INTER
12707219
SEAL, F/INJN
FUEL RL
12659782
PIPE, FUEL FEED
INTER
12684046
SEAL KIT, F/INJR
(O RING)
12673056
PIPE, FUEL FEED
INTER
12684047
SEAL, F/INJN
FUEL RL
12665137
N/A
N/A
N/A
N/A
Encore/Cruze/Trax
Equinox/Terrain
Malibu
Volt
1
1
8
1
1
1
1
1
1
1
1
4
1
1
Bulletin No.: 20-NA-047
January, 2023
Page 5
Warranty Information
For vehicles repaired under the Base Emission
Warranty coverage (Code E), use the following labor
operation. Reference the Applicable Warranties section
of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation
Vehicle
Description
Labor Time
4087348*
All
Crankcase Pressure Test
0.3 hr
Add
Encore
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
3.0 hrs
Add
Cruze
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
3.8 hrs
Add
Equinox
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
3.3 hrs
Add
Malibu
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
4.7 hrs
Add
Trax
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
3.0 hrs
Add
Volt
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
3.5 hrs
Add
Terrain
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
3.3 hrs
*This is a unique Labor Operation for bulletin use only.
Version
7
Modified
Released February 28, 2020
Revised March 12, 2020 – Updated the quantity for part number 12636176 and the
Warranty Information section to add new labor times.
Revised April 17, 2020 – Removed Korea from Involved Region or Country section and
changed Crankshaft Pressure Test to Crankcase Pressure Test.
Revised July 23, 2020 – Updated the Parts Information section.
Revised March 08, 2021 – Added Fuel Injector Bolt P/N 55570735 to the Parts
Information.
Revised April 07, 2021 – Increased Labor Time to 3.0 hrs for Encore and Trax in the
Warranty Information section.
Revised January 13, 2023 – Added the 2021–2022 Model Years to applicable models.
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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