20NA047

Bulletin No.:
Service Bulletin
Date:
20-NA-047
March, 2020
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
Engine:
from
to
Encore
2016
2019
1.4L
(RPO LE2)
Cruze
2016
2019
1.4L
(RPO LE2)
Equinox
2018
2020
1.5L
(RPO LYX)
Malibu
2016
2020
1.5L
(RPO LFV)
Trax
2019
2019
1.4L
(RPO LE2)
Volt
2016
2019
1.5L
(RPO L3A)
Terrain
2018
2020
1.5L
(RPO LYX)
Transmission:
Involved Region or Country
North America, China, Thailand, GM Korea, 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 2020 General Motors LLC. All Rights Reserved.
Page 2
March, 2020
Bulletin No.: 20-NA-047
Crankshaft 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
March, 2020
Page 3
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.
5519694
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.
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.
4. Replace the orifice as necessary along with the
camshaft cover gaskets.
5. Install the camshaft cover.
Parts Information
Causal Part
Vehicle
Description
Part Number
Qty
X
All
ORIFICE, PCV VLV
12641875
1
N/A
All
GASKET, CM/SHF
POSN ACTR SOL VLV
12636176
N/A
All
GASKET, CM/SHF
CVR (OUTER)
12636177
N/A
All
GASKET, CM/SHF
CVR (INNER)
12636384
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
1
1
1
1
1
1
Page 4
March, 2020
Bulletin No.: 20-NA-047
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
Description
Labor Time
4087348*
Crankshaft Pressure Test
0.3 hr
2.0 hrs
Add
Camshaft Cover Inspection,
Cleaning and Orifice
Replacement
*This is a unique Labor Operation for bulletin use only.
Version
1
Modified
Released February 28, 2020
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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