20NA047 Service Bulletin/Repair Instructions

Service Bulletin
Bulletin No.:
20-NA-047
Date:
July, 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
Encore
2016
2019
1.4L

(RPO LE2)
Cruze (Gen II

- VIN B)
2016
2019
1.4L

(RPO LE2)
Equinox
2018
2020
1.5L

(RPO LYX)
Malibu
2016
2020
Trax
2019
2019
1.4L

(RPO LE2)
Volt
2016
2019
1.5L

(RPO L3A)
Terrain
2018
2020
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 2020 General Motors LLC. All Rights Reserved.
Page 2
July, 2020
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
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.
Camshaft Cover Inspection, Cleaning

and Orifice Replacement
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.
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.
Bulletin No.: 20-NA-047
July, 2020
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.
Page 3
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.

4. Replace the orifice as necessary along with the

camshaft cover gaskets.

5. Install the camshaft cover.
Page 4
July, 2020
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
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

1

1

1

1

1

1

1

1

1

1

1
Bulletin No.: 20-NA-047
July, 2020
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

4087348*
Add
Add
Add
Add
Add
Add
Add
Labor

Time
Vehicle
Description
All
Crankcase

Pressure Test
0.3 hr
Encore
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
2.0 hrs
Cruze
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
3.8 hrs
Equinox
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
3.3 hrs
Malibu
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
4.7 hrs
Trax
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
2.0 hrs
Volt
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
3.5 hrs
Terrain
Camshaft Cover

Inspection,

Cleaning and

Orifice

Replacement
3.3 hrs
*This is a unique Labor Operation for bulletin use only.
Version
4
Modified
Released February 28, 2020

March 12, 2020 – Updated the quantity for part number 12636176 and the Warranty

Information section to add new labor times.

April 17, 2020 – Removed Korea from Involved Region or Country section and changed

Crankshaft Pressure Test to Crankcase Pressure Test.

July 23, 2020 – Updated the Parts Information section.
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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