Bulletin No.: 23-NA-102

LM2 – Wiring Harness Contact at Alternator Bracket.
– The engine wire harness was chafed by a bracket
next to the back of the alternator.
U0073 CAN BUS 2 off or U0074 CAN BUS 3 off

6357546

LM2 – TCCM Wiring Harness Contact at A/C Line and
Bracket near Alternator.

LZ0 Area of Concern at Alternator Bracket

6367093

Bulletin No.: 23-NA-102

August, 2023

Page 7

6367095

6357562

LZ0 – The Wiring Harness Contacted the Alternator
Bracket do to Routing of the Harness.
Note: During the repair. It was noted that a 5/8 ths
diameter hose was used to prevent a reoccurring chafe
condition.

Page 8

August, 2023

Bulletin No.: 23-NA-102

6357567

This is CAN 3 wire harness. Can 4 is also in this bundle
only blue and yellow twisted with white.
LZ0 – Wiring Harness Contacting the A/C Line and
Alternator Bracket.

•
•
•

For both the LM2 and the LZ0, the DTCs that may be
common with the wiring harness contacting the A/C
line and alternator bracket:
• P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
• P10C6 Engine Diagnostic Status Signals
Message Counter Incorrect
• P1789 Current Transmission Range Unknown
• U0073 Control Module Communication CAN Bus
2 Off
• U0074 Control Module Communication CAN Bus
3 Off
• U0076 Control Module Communication Powertrain
Sensor CAN Bus Off
• U010E Lost Communication with Reductant
Control Module
• U0140 Lost Communication with Body Control
Module
• U0198 Lost Communication with Telematic
Control Module
• U029E Lost Communication with Nitrogen Oxides
Sensor 2
• U0402 Invalid Data Received from Transmission
Control Module
• U0403 Invalid Data Received from Transfer Case
Control Module
• U0404 Invalid Data Received from Gear Shift
Control Module
• U040F Invalid Data Received from Reductant
Control Module
• U0418 Invalid Data Received from Brake System
Control Module 1
• U0422 Invalid Data Received from Body Control
Module

•
•
•
•
•
•
•
•
•
•
•
•

U1009 Reductant Control Module CAN Bus 3 Off
U1345 Engine Control Module LIN Bus 1
U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
U1609 Lost Communication with Serial Data
Gateway Module on CAN Bus 3
U1610 Lost Communication with Brake System
Control Module 1 on CAN Bus 2
U1643 Lost Communication with Transmission
Control Module on CAN Bus 2
U18D2 Lost Communication with Gear Shift
Control Module on Powertrain Sensor CAN Bus
U18D3 Lost Communication with Gear Shift
Control Module on CAN Bus 3
U2204 Serial Data Gateway Module Lost
Communication with Reductant Control Module
U220F Serial Data Gateway Module Lost
Communication with Transmission Control Module
U2212 Reductant Control Module Lost
Communication with Engine Control Module
U2405 Gear Shift Control Module Lost
Communication with Engine Control Module on
CAN Bus 2
U2419 Serial Data Gateway Module Lost
Communication with Brake System Control
Module 1 on CAN Bus 2
U241C Serial Data Gateway Module Lost
Communication with Engine Control Module on
CAN Bus 2
U241D Serial Data Gateway Module Lost
Communication with Engine Control Module on
CAN Bus 3

Bulletin No.: 23-NA-102

August, 2023
•

Loose Ground

•
•
•
•
•
•
•
•
•
•
6400093

Inspect ground connections G176A (1) and G177B (2)
may exist. Please check for any:
• Loosen condition
• Damaged or dirty threads
DTCs that may be common with a loose ground:
• P00EB Intake Air Temperature Sensor 3
Circuit High
• P0108 Manifold Absolute Pressure Sensor
Circuit High
• P045A Exhaust Gas Recirculation Valve 2 Control
Circuit
• P0494 Cooling Fan Speed Too Low — Left Side
• P0615 Starter Relay Control Circuit
• P0617 Starter Relay Control Circuit High Voltage
• P0628 Fuel Pump Control Circuit Low
• P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
• P1098 Fuel Rail Pressure Performance During
Deceleration Fuel Cut-Off
• P129F Fuel Pump Power Control Module Fuel
Pump Speed Signal Incorrect
• P12A6 Fuel Pump Power Control Module Enable
Circuit Performance
• P189C Transmission Range Command Message
Performance
• P2053 Reductant Injector 2 Control Circuit
• P305D DC/DC Converter Crank Input Signal
Circuit High Voltage

•
•
•
•
•

Page 9

P3187 Fuel Pump Pressure Performance - Low
Pressure
P31C3 Stop/Start System Performance
U0284 Lost Communication with Active Grille Air
Shutter Actuator 1
U0285 Lost Communication with Active Grille Air
Shutter Actuator 2
U02A9 Lost Communication with Charge Air
Cooler Coolant Pump
U0585 Invalid Data Received from Active Grille Air
Shutter Actuator 1
U0586 Invalid Data Received from Active Grille Air
Shutter Actuator 2
U0623 Lost Communication with Heater
Coolant Pump
U0632 Lost Communication with Cooling Fan
Motor
U0633 Lost Communication with Engine Cooling
Fan 2
U0650 Lost Communication with Exhaust
Pressure Regulator Valve Position Sensor
U1345 Engine Control Module LIN Bus 1
U1346 Engine Control Module LIN Bus 2
U1347 Engine Control Module LIN Bus 3
U137E Invalid Data Received from Auxiliary
Coolant Pump
U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1

Parts Information
Causal
Part

Description

Part
Number

Qty

N/A

SPLICE,WIRE
(SALMON)

19300089

As Required

N/A

Woven Polyester
(PET)
Electrical Tape**

1985620
(USA)*
894.1230
(Canada)*

1

*There is enough material to service multiple vehicles. Store
the remaining material for future use.
**For USA, contact Wurth though website
www.wurthusa.com, by e-mail at
[email protected], or by calling 1-800987-8487.
For Canada, contact Wurth though their website at
www.wurth.ca/, by e-mail at [email protected], by calling 1800-263-5002 or your local Wurth rep.

Page 10

August, 2023

Bulletin No.: 23-NA-102

Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor Operation

Description

Labor Time

5486388*

Repair Wire Chafe on LM2 and LZ0 T1 LD SUV and LDPU

1.0 hr

Add

Additional Wire Repair (As Required)

0.2 hr

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

Version

5

Modified

Released June 12, 2023
Revised June 29, 2023 - Add Breakpoint Date of June 1, 2023.
Revised July 19, 2023 - Added the Additional Keywords section.
Revised August 01, 2023 — Added DTC’s and Loose Ground Section and Added 2024
Model Year for Silverado 1500 and Sierra 1500.
Revised August 17, 2023 – Update the Information in the Cause and Correction section,
Update Graphic in CAC Electrical Connector section, and Added Additional DTCs.

Additional Keywords: P0658, P0659, P2812, P2814,
P2815, P281B, P281D, P281E, P0960, P0962-P0964,
P0966-P0968, P0970, P0971, P2670, P2671, P2718,
P2720, P2721, P2727, P2729, P2730, P2736, P2738,
P2739, P2824, P2826, P2827, P0716, P0717, P07BF,
P07C0, P1783, P17CE, P0721-P0723, P077C, P077D,
P172A, P172B, P0707, P0708, P2802, P2803, P2805,

P0711, P0712, P0713, P176B-P176D, P178F, P17D3,
P17C5, P17C6, P17CC, P17CD, P17D6, P17F5,
P17F6, P17F7, P17FA, P17FB, P17FC, P18A2,
P18A3, P18A4, P27EB, P27ED, P27EE, P2796,
P2797, P2798, P2799, U1611

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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