18-NA-102

Service Bulletin
Bulletin No.:
18-NA-102
Date:
April, 2022
TECHNICAL
Subject:
Multiple Electrical Concerns, Intermittent Multiple Instrument Panel Cluster (IPC)
Warning Lamps Illuminated, Intermittent Multiple Message on Drivers Information
Center (DIC), Intermittent and/or Inoperative Loss of Interior and Exterior Lighting,
Engine Performance Concerns, Stalling, Transmission Shift Performance Concerns,
Malfunction Indicator Lamp (MIL) Illuminated
This Bulletin replaces PIT5596. Please discard PIT5596.
Brand:
Model:
Chevrolet
Express
GMC
Savanna
Copyright 2022 General Motors LLC. All Rights Reserved.
Model Year:
from
to
2003
2021
VIN:
from
Engine:
to
Transmission:
Page 2
Involved Region or Country
April, 2022
Bulletin No.: 18-NA-102
North America and N.A. Exports.
Some customers may comment on, but not limited to, one or more of the following
conditions:
Note: Not all of the effects or driver notifications listed have been experienced. However,
the different effects and driver notifications may be caused by one of the wires in the IPC
harness being chafed or cut. Components on different lines in the list below are in
different circuits. Due to the cause of the condition, and the positions of the wires in the
IPC harness, it is unlikely that more than one circuit and/or fuse will be affected by the
condition.
Condition
• IPC Warning Lamps Illuminated: theft, ABS, Stabilitrac, brake warning, traction
control, airbag light, door open warning, emissions light, battery charge, Malfunction
Indicator Lamp (MIL)
• Intermittent and/or Inoperative Loss of Interior and Exterior Lighting: turn signals,
cluster gauges, interior lights, brake lights, marker lights, back-up lamps, license
lamps, center high mount stop lamp, headlights, dash lights, hazard lights, PRNDL
indicator
• Engine Performance Concerns: fuel Pump Inoperative (Crank/No Start), stalling,
reduced engine power, misfire, runs rough
• Transmission Shift Performance Concerns
• Intermittent and/or Inoperative Multiple Electrical Concerns: power door locks, power
windows, aux power output/cigarette lighter, radio, speakers, key fob, cruise control,
wipers, horn
Some technicians may find one or more DTC set.
Some technicians may also find one or more of the following fuses blown:
• F7UA - BCM 5
• F8UA - BCM 7
• F9UA - BCM 4
• F10UA - IPC
• F11UA - TRLR WRG
• F12UA - Spare
• F14UA - Wash
• F22PA - Ign sw DLIS / PK3
• F25UA - Aux Pwr Outlet
• F26UA - BCM 3
• F27UA - SEO
• F28UA - Airbag
• F29UA - STR/WHL/SNSR
• F46UA - AC/DC INV or Spare
• F58UA - BCM 2
• F59UA - BCM 1
• F72UA - BCM 6
• F75UA - V6 Fuel Inj
Bulletin No.: 18-NA-102
April, 2022
Page 3
Cause
5031150
Page 4
April, 2022
Bulletin No.: 18-NA-102
This condition may be caused by the main Instrument Panel (IP) wiring harness
contacting one or more of the following:
• Brake booster mounting bracket
5035298
• Brake pedal pivot bolt
5035707
• Parking brake mechanism.
Bulletin No.: 18-NA-102
April, 2022
Page 5
Correction
5033658
1. With a suitable light, inspect the IP wiring harness point of contact.
2. Repair the harness as needed.
⇒ Refer to Wire to Wire Repair in SI.
3. Using Woven Polyester Electrical Tape (PET), tape all the contact points of the IP
harness ensuring that the tape is applied in a double layer extending along the
brake booster mounting bracket.
⇒ If required, replace the blow fuse in regards to repair performed on the IP
harness.
Page 6
April, 2022
Bulletin No.: 18-NA-102
6049817
Important: Verify the harness clip has been inspected and still attached. If found
damaged, install a new clip and re-attach.
Parts Information
Causal
Part
Description
Part
Number
Qty
N/A
CLIP,
HIGH TEMP
84501389
1
N/A
Woven Polyester
(PET)
Electrical Tape**
1985620
(USA)*
894.1230
(Canada)*
As
Necessary
*There is enough material to service multiple vehicles. Store
the remaining material for future use.
**For USA, contact Wurth through their website at
www.wurthusa.com, by e-mail at
[email protected], or by calling 1-800987-8487
**For Canada, contact Wurth through their website at
www.wurth.ca/, by e-mail at [email protected], or by calling 1800-263-5002 or your local Wurth rep.
Bulletin No.: 18-NA-102
April, 2022
Page 7
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
1036102
Wire to Wire Repair - Instrument Panel and Console
Use the Published Labor
Operations Time
Version
2
Modified
Released April 09, 2018
Revised April 20, 2022 - Added 2018–2021 to Model Year, Updated Correction section
and Added 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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