Bulletin No.:

Service Bulletin

Date:

17-NA-317
February, 2020

TECHNICAL
Subject:

Brand:

Transmission Shudder or Fish Bite above 40 MPH (65KPH), Cruise Control
Disengages, Low Idle and/or Stalling after Auto Start, Reduced Engine Power or
Service Brake Assist System Displayed on Driver Information Center (DIC),
Malfunction Indicator Lamp (MIL) Illuminated - DTCs P034B, and/or P0506 Set

Model:

Buick

Enclave

Chevrolet

Traverse

Model Year:

VIN:

from

to

2018

2018

from

Engine:

Transmission:

to
LFY

Involved Region or Country

North America, Middle East, Israel, Chile, Colombia, Peru, Russia, Africa

Condition

Some customers may comment on one or more of the following conditions:
• MIL is illuminated
• Cruise Control may disengage by its self with no Codes set
• Low idle and/or stall after auto start
• Reduced Engine Power displayed on DIC
• Service Brake Assist displayed on DIC
• While cruising over 40 MPH (65 KPH), transmission slips out of gear and slams back
into gear
The technician may find one or more of the following DTCs set:
• P034B: Crankshaft Position Sensor - Crankshaft Direction Incorrect in the Engine
Control Module (ECM)
• P0506: Idle Speed Low in the ECM
Some technicians may also find one and/or more of the following:
• Low Idle & Stall after auto start may cause DTC P034B & P0506 to set in history.

Cause

This condition may be caused by the Crankshaft Position Sensor (CPS) circuit picking up
EMI interference from unrelated control circuit in the same harness.

Correction

Replace the crank sensor portion of engine harness with a twisted pair jumper harness
between the crank sensor and ECM connector.

Copyright 2020 General Motors LLC. All Rights Reserved.

Page 2

February, 2020

Service Procedure
G109 Ground Wire Inspection and Repair

5034556

1. Remove the fastener that secures the G109
ground. refer to Document ID: 4755270 in SI.
2. Inspect the eyelets for either excess heat shrink
tubing (1) or glue under the eyelet (2).
⇒ Inspect for adhesive that has seeped out onto
the eyelet during the heating of the shrink tube,
or the shrink tube itself extending into the
eyelet area.
3. Carefully trim the heat shrink tube if needed, clean
adhesive from the eyelet (sand off), reinstall and
torque.
⇒ Torque fastener to specifications. Refer to
Fastener Specifications in SI.

Wiring Circuits Removal
Note: The heat wrapped section of the wiring harness
is routed to the CPS electrical connector.
Important: Do Not overlap or twist together any
excessive wiring harness. The wiring harness has been
measured to be secured alongside the engine harness
without any extra length.

Bulletin No.: 17-NA-317

Bulletin No.: 17-NA-317

February, 2020

Page 3

4724840

1. Remove the air cleaner housing (1) with the air
cleaner outlet duct as an assembly.

4872638

2. Locate the engine control module (1) X3 electrical
connector (P/N 12582678).
3. Disconnect the electrical connector (2).
4. Using care, remove the tape covering the wiring
harness.

Page 4

February, 2020

Bulletin No.: 17-NA-317

4871826

Note: It is recommended not to remove the terminals
at the same time, but to replace one terminal at a time.
5. Using a terminal extractor, identify the following
circuits and remove the wire terminals from the
electrical connector:
• Circuit 6270 (cavity 6, wire color VT/BU)
• Circuit 6271 (cavity 7, wire color GN)
• Circuit 6272 (cavity 22, wire color BL/VT)
6. Cut the wire terminals away from the connector.
7. Install the CPS wire harness terminals into their
respective cavities into the connector.

4872742

8. Using Woven Polyester Electrical Tape (PET), tape
the CPS harness (1) to the engine harness (2)
ensuring that the tape is applied in a double layer
extending along the harness past the contact
points.
9. Connect the engine harness electrical connector to
the ECM.

Bulletin No.: 17-NA-317

February, 2020

Page 5

4873057

Important: Do Not secure the crank sensor harness
to the engine harness at this time.
10. Route the jumper following the route of the main
engine harness around the side of the intake
manifold, over the transmission, across the back of
the engine as shown in the graphic above.
11. Raise the vehicle.

4751671

Page 6

February, 2020

Bulletin No.: 17-NA-317

12. For AWD, remove the exhaust front pipe (1). Refer
to Exhaust Front Pipe Replacement in SI.

4769156

Note: Due to the location of the crankshaft sensor
electrical connector, removal of the sensor will allow for
easy electrical connector separation.
13. Remove the crankshaft sensor (3).
14. Disconnect the electrical connector (1).
15. If required, install new sensor O-ring (4).

16. Install the crankshaft sensor.
• Torque the bolt (2) to specifications. Refer to
Fastener Specifications in SI.

Bulletin No.: 17-NA-317

February, 2020

Page 7

4872922

17. Cut the crankshaft sensor electrical connector from
the harness.

4871831

Note: It is recommended not to remove the terminals
at the same time, but to replace one terminal at a time.
18. Using a terminal extractor, identify the following
circuits and remove the wire terminals from the
connector:
• Circuit 6270 (cavity 1, wire color VT/BU)
• Circuit 6272 (cavity 2, wire color BL/VT)
• Circuit 6271 (cavity 3, wire color GN)

Page 8

February, 2020

Bulletin No.: 17-NA-317

4872974

19. Install the crankshaft sensor wire harness
terminals into their respective cavities in the
connector.
20. Using Woven Polyester Electrical Tape (PET), tape
the CPS harness ensuring that the tape is applied
in a double layer extending along the harness past
the contact points.
21. Using tie straps, route and secure the harness:
• Using tie straps, add one each 120 mm
(estimated 25 pcs per harness) if there is a clip
were the tie strap should be installed then move
10 mm to the right or left of that existing clip.
• Route and secure the CPS harness at the
engine harness along the back of the engine.
22. Connect the CPS electrical connector.
23. For AWD, install the exhaust front pipe.
24. Lower the vehicle.
25. Using tie straps, secure the CPS harness:
• Using tie straps, add one each 120 mm
(estimated 25 pcs per harness) if there is a clip
were the tie strap should be installed then move
10 mm to the right or left of that existing clip.
• Secure the CPS wiring harness to the engine
wiring harness starting from the rear side of the
engine.
• Secure any access CPS wiring harness.
26. Install the air cleaner housing with the air cleaner
outlet duct as an assembly.

Parts Information
Causal
Part

Description

Part
Number

Qty

X

Harness, CRK
Wiring

84441605

1

N/A

GASKET, EXH
SYS INTER

23161602

1

N/A

GASKET,
CTLTC CONV

84135650

2

Warranty Information
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

Description

5480518*

Crankshaft Positioning
Sensor Wiring Harness
Installation

Add

G109 Ground Wire
Inspection and Repair

Labor Time
1.2 hr (FWD)
1.8 hr
(AWD
— F48)
0.2 hr

*This is a unique Labor Operation for Bulletin use only.

Bulletin No.: 17-NA-317

February, 2020

Page 9

Version

9

Modified

Released October 4, 2017
Revised Oct. 25, 2017 - Update part description.
Revised Dec. 4, 2017 - Update VIN breakpoint date.
Revised Jan. 10, 2018 - Remove WPC information and update part number.
Revised Jan. 29, 2018 - Update Conditions section.
Revised March 13, 2018 - Removed VIN breakpoint date and revised labor times.
Revised April 06, 2018 - Add G109 information to Service Procedure and Warranty
Information sections.
Revised June 25, 2018 - Remove DTC’s in Subject and Condition section.
Revised February 13, 2020 — Removed DTC P0557.

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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