and G300
1. Turn OFF the ignition and all accessories.
2. Locate the X150 connector. Refer to Wiring
Systems and Power Management > Component
Locator > Master Electrical Component List > X150
in SI.
3. Inspect the connector for the following conditions:
• Backed out terminals
• Bent pins
• Corrosion
• Poor terminal fit (use the correct test probe)
⇒ If a condition is found, repair as needed. Refer
to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI.
AND
⇒ If corrosion is found, proceed to the section of
this bulletin titled: Repairing Fretting
Corrosion to complete the repair.
⇒ If a condition or corrosion is not found, proceed
to Step 4.

Bulletin No.: 08-07-30-021G

March, 2012

2297689

4. Inspect for a misrouted harness having chafed,
damaged, pinched, open or shorted wiring from
rubbing on the cooling fins of the Transmission
Auxiliary Fluid Pump Control Module as shown.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 8.
⇒ If the wiring is not damaged, proceed to Step 5.

2305639

Page 17

5. Inspect for chafed, damaged, pinched or shorted
wiring caused by a mispositioned harness retaining
clip as shown. This condition usually occurs when
the tab of the clip is aligned with a slot in the
conduit.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 8.
⇒ If the wiring is not damaged, proceed to Step 6.
6. Locate ground connections G102 and G300. Refer
to Wiring Systems and Power Management >
Component Locator > Master Electrical
Component List > G102 and G300 in SI.
7. Inspect G102 and G300 for a clean and tight
connection. Undercoating or corrosion may be
present between the eyelet and the frame resulting
in a poor connection.
⇒ If a poor connection or undercoating is found,
clean the area and repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic
Information and Procedures in SI.
Proceed to Step 8.
⇒ If corrosion is found, clean the area and repair
as needed. Refer to Power and Signal
Distribution > Wiring Systems and Power
Management > Diagnostic Information and
Procedures in SI. Proceed to the section of this
bulletin titled: Repairing Fretting Corrosion to
complete the repair.
8. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.

Page 18

March, 2012

Hybrid Models (RPO HP2) Data Link
Resistor 2

Bulletin No.: 08-07-30-021G

Hybrid Models (HP2) Equipped With
OnStar® Delete RPO UE0 — IP Junction
Block Jumper Harness Loop Connector
Chafed Wiring

1. Turn OFF the ignition and all accessories.

Various Symptoms and/or Powertrain and
Communication DTCs Set
The following is a list of some of the DTCs that may be
set and is not all inclusive: C0242, P0700, P0AC4,
U0293, U0100, U0109, U0129, U0140, U1862, U186B,
U1886 or U1888.
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.

2652658

2. Inspect the harness leading to the data link
resistor 2 (1) for chafed, damaged, pinched, open
or shorted wiring. Refer to Power and Signal
Distribution > Data Communications > Schematic
and Routing Diagrams > Data Communication
Schematics.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed.
⇒ If the wiring is not damaged, proceed to Step 3.
3. Disconnect the electrical connector from the data
link resistor 2.
4. Test the data link resistor 2 for 110–130Ω.
⇒ If the resistance is not within the specified
range, replace the data link resistor 2 and
proceed to Step 5.
⇒ If the resistance is within the specified range,
connect the electrical connector to the
terminator resistor. Refer to Power and Signal
Distribution > Data Communications > Scan
Tool Does Not Communicate with High Speed
GMLAN Device OR Diagnostic Trouble Code
(DTC) List - Vehicle in SI.
5. Connect the electrical connector to the data link
resistor 2. Secure the resistor as needed.
6. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.

2658675

3. Locate the junction block (1) on the driver side of
the vehicle under the instrument panel (IP).

2658705

Bulletin No.: 08-07-30-021G

March, 2012

4. Locate the jumper harness loop connector that
plugs into the bottom back of the junction block.

Page 19

Lost Communication with Various
Control Modules and DTCs Set
DTC Descriptors
Note: Depending on the vehicle and vehicle build
there may be other DTCs set by other modules.
•
•
•
•
•
•
1.

2658869

5. Inspect the jumper harness loop connector (1) for
chafed (2), damaged, pinched, open or shorted
wiring from contact with the IP brace.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
harness by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the jumper
harness loop connector as needed. Proceed to
Step 6.
⇒ If the wiring is not repairable, replace the
P/N 15127940 jumper harness loop connector.
Protect the connector by covering any sharp
edge with butyl tape and the jumper harness
loop connector wiring with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 6.
6. Secure the junction block as needed.
7. Connect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
8. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.

2.
3.
4.

⇒

⇒
5.
6.

DTC U0073 Control Module Communication
Bus A Off
DTC U0100 Lost Communication with Engine/
Powertrain Control Module (ECM/PCM)
DTC U0101 Lost Communication with
Transmission Control Module (TCM)
DTC U0102 Lost Communication with Transfer
Case Control Module
DTC U0121 Lost Communication with Electronic
Brake Control Module (EBCM)
DTC U0140 Lost Communication with Body
Control Module (BCM)
Connect a scan tool and perform the Diagnostic
System Check – Vehicle. Retrieve and record any
DTCs, Current or in History from all of the control
modules.
If any DTC(s) are set, refer to Diagnostic Trouble
Code (DTC) List – Vehicle to identify the
connector(s) of the control module/component
which may be causing the condition.
Turn OFF the ignition and all accessories.
Disconnect the connector(s) at the affected
module.
Inspect the connector(s) for the following
conditions:
• Backed out terminals
• Bent pins
• Corrosion
• Poor terminal tension. Use the correct test
probe.
• Water intrusion
If a condition is found, repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic Information
and Procedures in SI.
Proceed to Step 5.
If corrosion or water intrusion is found, proceed to
the section of this bulletin titled: Repairing Fretting
Corrosion to complete the repair.
Reconnect the connector at the affected module.
Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.

Page 20

March, 2012

Inspection of Electronic Suspension
Control (ESC) Module Connector for
Missing Weather Plugs in Not Used
Cavities (RPO Z55 or G69)
1. Turn OFF the ignition and all accessories.

Typical Location of ESC Module

Bulletin No.: 08-07-30-021G

Electrical Component List > Electronic Suspension
Control (ESC) Module > Connector End View for a
list of cavities that are: Not Used.
⇒ If a weather plug is missing from any Not Used
cavity, repair as needed.
5. Install the connector (2) to the ESC module (1).
6. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.

Repairing Fretting Corrosion
Note: Fretting corrosion looks like little dark smudges
on the electrical terminals and appear where the actual
electrical contact is being made. In less severe cases it
may be unable to be seen or identified without the use
of a magnifying glass.
1. If water intrusion is observed in the connector, use
pressure regulated compressed air to dry it out.

2664329

2. Locate the ESC module (1).
3. Disconnect the connector (2) at the ESC
module (1).

Typical View of Missing Weather Plug

2214281

2664512

4. Inspect the connector of the ESC module for
weather plugs that are missing from: Not Used
cavities (1). Refer to > Power and Signal
Distribution > Wiring Systems and Power
Management > Component Locator > Master

2. DO NOT apply an excessive amount of dielectric
lubricant as shown, to the connectors as hydrolock
may result when attempting to mate the
connectors. This could cause terminals to back
out, resulting in an intermittent connection.
Important: Use ONLY a clean nylon brush that is
DEDICATED to the repair of this specific condition.
Using a one-inch or smaller nylon bristle brush,
apply dielectric lubricant P/N 12377900 (in Canada
P/N 10953529) to both the module or component
side and the harness side of the affected
connectors.
3. Reconnect the affected connector(s) and wipe
away any excess lubricant that may be present.
4. If needed, connect the negative battery cable.
Refer to Battery Negative Cable Disconnection and
Connection in SI.
5. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
OnStar is a registered trademark of the OnStar
Corporation.

Bulletin No.: 08-07-30-021G

March, 2012

Parts Information

Labor
Operation

Description

J-38125 Terminal Repair
Kit, Yazaki Tray Number 12
- Female Terminal

—

N6629
(MY2009
and Prior)

Wiring and/or
Connector-Transmission –
Repair or Replace

RESISTOR - DATA LINK

—

N6616
MY2009
and Prior

Serial DATA/DLC/STAR
Connector Wiring and/or
Connector Repair or
Replacement

N6620
(MY2009
and Prior)

Power and Grounds
Distribution Wiring and/or
Connector Repair or
Replacement

N6650
(MY2010
and Newer)

Terminal Replacement

N6653
(MY2010
and Newer)

Wire to Wire Repair

N6654
(MY2010
and Newer)

Connector Reconnection

N6656
(MY2010
and Newer)

Ground Stud or Nut Repair or
Replacement

N1736

Block Assembly, Wiring
Harness Junction - Left Body
and Instrument Panel Replace

N9613*

Lubricate Body Control Module
(BCM) Connector With
Dielectric Lubricant

J7729*

Lubricate Engine Control
Module (ECM) Connector With
Dielectric Lubricant

K9534*

Lubricate Transmission Control
Module (TCM) Connector With
Dielectric Lubricant

H9740*

Lubricate Electronic Brake
Control Module (EBCM)
Connector With Dielectric
Lubricant

N9612*

Lubricate “Other” Connector
With Dielectric Lubricant**

N9544*

Repair and Reroute IP Wire
Harness Near Park Brake

Description

22124472200
88988999

-

For vehicles repaired under warranty, use:
Material
Allowance

Part Number

12377900
(in Canada,
10953529)

Page 21

Dielectric Lubricant
(50 gram tube)

Woven Polyester (PET)
Electrical Tape

$11.56
(USD)
($2.90 per
repair)
$17.35
(CDN)
($4.35 per
repair)
$22.72
($3.00 per
repair)

Warranty Information
For transmission electrical repairs please note in the
technicians comments field on the repair order which
terminal number(s) were repaired or replaced. Also if a
male terminal is bent (transmission side of connector),
then indicate the bent terminal number on the repair
order.

Labor
Time

Use
Published
Labor
Operation
Time

0.1-0.3 hr

0.8 hr

*This is a unique labor operation for bulletin use only. It will
not be published in the Labor Time Guide.
**You Must Document the Affected Connector on the Repair
Order.
Note: Any additional time for component R&R to gain
access or for repair time greater than 0.3 hr must be
submitted as Other Labor Hours and requires appropriate
authorization and service management approval.

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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