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Technical Bulletins TEST

Technical Bulletins provide up-to-date information on issues that come up during the model year. These issues require a more immediate distribution of technical information than the annual Body Builder Manuals can provide. The need for a technical bulletin may be driven by one of the following:

  • Mid-year design change to the vehicle that affects upfitter modifications
  • Information from a GM Service Bulletin that specifically affects upfitter modifications
  • Frequent submissions involving one particular issue that many upfitters encounter
Light Duty
Vehicles include the Canyon/
Colorado, Sierra/Silverado,
Express/Savana, Tahoe/Yukon/
Suburban, Uplander, etc.
Medium Duty
Vehicles include the
Top Kick/Kodiak, the
W, T, N, and F-Series,
etc.
Passenger
Vehicles include the
Caprice, Impala, Malibu,
and Volt
To find applicable bulletins select the appropriate information from the pull down menus for a specific search.

File

Number

Date Posted

Description

File Number Date Posted Description
206 10/30/2025 Information on Hesitation and/or Misfire Sensation When Passing Under High Voltage Transmission (Power) Lines - Multiple Intermittent ABS DTCs Set
205 10/30/2024 9L7 Upfitter AUX Switches - Higher Trim Levels
204 10/08/2024 Tahoe PPV/SSV Emergency Lighting and Aftermarket Equipment- Liftgate Struts Warning
203c 01/28/2026 UVM (Universal Vehicle Module) Information
202 06/26/2024 Backup Alarm Installation Recommendations
200 02/04/2025 Upfitter Power Provisions Silverado EV
199 02/20/2024 Silverado EV - Exterior Panel Dimensions
198 02/04/2025 High Voltage Disabling/Enabling Various EV Models
197 11/15/2023 BrightDrop ZEVO Exterior Panel Dimensions
196 02/04/2025 Adding Upfitter Switches (9L7) - BrightDrop Zevo Vans
195 08/04/2023 Cautionary – NO Drill/Air Bag Zones Chevrolet Silverado EV
194 08/01/2023 Identifying Taillamp Type and Wiring Configurations - 2024 HD Full-Size Trucks
193f 10/30/2025 Installation of Upfitter (AUX) Switches (9L7) components (2022i - 2025 Full-size Trucks) Preliminary
192 08/29/2023 BrightDrop Zevo Delivery Inspection Training Video and Forms
191 07/25/2023 Cautionary – NO Drill/Air Bag Zones – Zevo Cargo Van
190 04/06/2023 Battery Negative Cable Disconnection and Connection - Bright Drop Zevo 600
189 04/06/2023 EV - High Voltage Safety
188 02/04/2025 Adding Ignition and Battery powered circuits for upfitter use – BrightDrop Zevo cargo vans.
187 07/12/2022 Adding Equipment to Vehicles with Air Bags (SIR) and Other Vehicle/Passenger Safety Systems.
186 04/12/2022 Fluid Leak in the Center of Vehicle on Drivers Side, Tapping/Knocking Noise on Turns
185 06/08/2023 Frame/Wheelbase Modifications – MD Trucks
184 02/15/2022 Park Status Signal 2019 and beyond MD Trucks
183 11/01/2021 First responder installed equipment disables or shuts down when the LH doors of the vehicle are opened, or the Start/Stop button is pressed. 2021 and Beyond Tahoe PPV/SSV
182 08/29/2023 Vehicle Speed Signal -MD Trucks
181 08/29/2023 Out of Park Signal - Chevrolet and GMC Full-size SUV Models
180 02/04/2025 Information on Obtaining Techline Calibrations for Law Enforcement and Government Vehicles
179 08/30/2021 NEW Wide Body Sideview Mirrors - Silverado MD Trucks
178 10/10/2022 Adding Remote Vehicle Start (BTV) - 2021 and beyond Tahoe PPV/SSV
177 03/08/2021 Adding Exhaust Brake (K40) and/or Upfitter Switches (9L7) - MD Trucks (2019 and beyond)
176 02/02/2021 Upfitter Provisional Out of Park" Signal"
175 01/11/2021 Back-up Alarm Installation (8S3)
174 12/02/2020 Rear Camera Inoperative - Camera kit 5N5
173 10/17/2023 Installing Ground Straps (UN9) Tahoe PPV
172 08/23/2022 Mid-Size Pickup Box Removal / FMVSS/Component Information Resource
171 05/25/2023 Removal/Deletion Front/Side Fuel Tank 2020 and beyond HD Chassis Cab
170 07/28/2020 360 Camera Views go Blank with Tailgate Removed
169 05/28/2020 Information on Removing Protective Film Bumper Covers Upon Delivery of Vehicle
168 02/04/2025 Box Removal with Blind Zone Alert (UKC) and Park Assist (UD5/UD7)
167 10/26/2020 HD Pickup Box Removal / ZW9 Capped Fuel Filler Assembly Components
165 10/26/2020 Fuel Filler Elbow Assembly `Service Body’ Installation MD Trucks
164 03/19/2020 Overhead Auxiliary (Upfitter) Switches (RPO UEH)
163 03/27/2020 Fuel Tank strategy and Auxiliary Tap Upfit interface MD Trucks
162 02/27/2020 Rear Chassis Electrical Harness attachments
161 01/16/2020 Next Generation (New Body Style) Snow Plow Jumper Harness Install
160 01/12/2026 Power Take Off (PTO) Operating Description and Application Guide - NEW Body Style Only
159 09/04/2019 Cap-less Fuel Fill Cover
158 08/27/2019 Adding an After-Market Trailer Brake Controller- MD Trucks
157 01/05/2021 Roof Beacon Wiring Provisions
156 08/13/2019 DEF Tank Relocation
155 01/20/2021 Upfitter Circuit Provisions w/o Upfitter (AUX) switches (preliminary)
154 07/19/2019 Upfit Body Mounting / Chassis Wiring Harness Routing
153 06/02/2023 Installation of Upfitter (AUX) Switches (9L7) components
152 10/30/2025 Adding or Installing a Rearview Camera - FST
151 09/21/2021 Adding or Installing a Rearview Camera Full size Cut-away Vans
150 11/18/2022 Adding or Installing a Rearview Camera – MD Trucks
149 03/01/2022 Converting Dual Fuel Tank (NSQ) to a Single Fuel Tank System (N2L/NVK) MD Trucks
148 08/21/2019 Upfitter (Aux) Switches (RPO 9L7) MD Trucks
147 10/28/2020 Snow Plow (VYU) & Upfitter (AUX) Switch (9L7) Power Provisions
146 02/12/2019 Partial Exhaust System Removal to enable installation of a PTO.
145 06/07/2018 Removal/Deletion - Rear Fuel Tank
144 02/21/2018 Service Body Remote Door Lock/Unlock Switch Wiring Provisions RPO WRF
143 10/30/2017 Relocating Roof Mounted Antenna
142 08/22/2018 Diesel Particulate Filter [DPF] Manual Regeneration [cleaning]
141 08/22/2018 Fuel Fill Tube Repositioning
140 07/21/2021 UV Protective covers on Fuel Tanks Components
139 03/22/2017 Fleet Key Option - Adding Keys / Converting
138c 08/06/2025 Rear Axle Vent Hose
137 11/01/2017 Upfitter Junction Block - Accessory Equipment Wiring (RPO 9L7)
136 01/09/2017 Gasoline and Diesel Engine Liquid Cooling System
135 10/27/2016 Turn Signals Engage When Depressing the Brake Pedal
134 10/07/2016 Guidelines for Diesel Fuel Filler Neck Assembly & Installation
133 09/07/2016 Rear Spring Shackle Bolt Length
132 06/14/2016 Air Deflector Usage/Installation
131 03/01/2019 Elevated Engine Coolant/Operating Temperatures with Snow Plow Mounted
130 08/31/2016 Removal of Wheel Washers Prior to Installation of Outer Dual Rear Wheel
129 01/29/2020 Rear Chassis Electrical Upfitter Connections
128 10/22/2015 One or more Exterior Lighting Functions Inoperative - Headlamps High/Low Beam, Hazard Lamps, Park Lamps, Stop Lamps
127 08/13/2019 Adding/deleting a Rear View Camera
126 07/21/2015 Optimizing Vehicle Trim Height
125 04/13/2015 Relocation of Electrical Components/ Devices
124 11/07/2019 (124x) - Radio HVAC IPC Blank Out When Operating A Snow Plow
123 05/22/2020 Roof Beacon (TRW) Switch Wiring Location/Access
122 04/20/2018 CHMSL/Cargo Lamp Wiring For Aftermarket Bed Cap Topper
121 04/02/2015 Transport Mode Message/Battery Light Flashing
120 01/02/2019 Power Take Off (PTO)Operating Description and Application Guide
119 08/14/2014 Info - Radio Telephone/Mobile Radio (Transceiver) Installation and Troubleshooting Guidelines
118 02/06/2015 Upfitter Configurable Auxiliary Circuits (9C1/5W4)
117 06/16/2017 Improper Engine Block Heater (Option K05) Usage - Continuous Power
116 12/06/2016 Snow Plow Lamp Activation
115 05/04/2018 Upfitter Circuit Provisions
114 03/01/2017 Winter Cover Usage For Vehicles Equipped With Diesel Engines
113 07/09/2015 Rear Lighting Junction Block Connections
112 12/11/2014 Cooling System Filling Procedure For Vehicles Equipped With an Rear Auxiliary Heater
111 08/12/2013 Auxiliary Power Connections
110 02/06/2019 Upfitter Auxiliary Switches (RPO 9L7)
109 03/13/2014 After-market Trailer Brake Controller Harness
108 05/18/2016 Aftermarket ALDL or DLC Interface Devices Causing Multiple Issues
107 06/06/2017 Removing/Re-Installation of Door Water Deflectors
106 06/06/2014 Fuel Cap Tether Strap
104 07/14/2015 Accessory Drive Equipment Loads for Diesels
103 02/25/2014 Service, Tool or Utility Box Sagging, Mis-Aligned
102 06/02/2016 Auxiliary Battery Connections
101 06/22/2012 Installation of Non-GM Approved Aftermarket Products on the Chevrolet Volt
100 09/11/2014 Properly Maintaining Vehicles in Dealer Inventory
99 06/06/2014 Upfitter Integration Safety Belt & Buckle Due Care Handling
98 06/26/2023 Service Body Mounting Guidelines
97 06/13/2014 " HYRAIL" FGAWR Upgrade
96 03/22/2011 Information on Seat Belt Changes 2010 to 2011 and Identification Guide
95 04/19/2018 Important Vehicle Labeling information
94 06/06/2014 Guidelines for installing Body mounts in GMT610 Cutaways
93 02/28/2011 External Radio Antenna Mounting Location Recommendation
92 09/24/2010 Generator Not Charging Properly
91 06/12/2021 Guidelines for Installing PRVs in GMT610 Cutaways
90 05/03/2018 CC Fuel Filler Assembly Service Body Installation Guide
89 06/07/2017 Installation of Electrical Aftermarket Accessories on 2-Mode Hybrid Full Size Trucks
88 10/05/2012 Information on Body Control Module(BCM) Grounds
87 06/26/2009 Malibu-Installation of Non-GM Approved Aftermarket Products
85 06/07/2018 RPO ENC, Provisions for a Rear Auxiliary Heater
83 04/19/2018 HyRail Upfit Applications
82 11/02/2023 Fast Idle - RPO UF3
81 11/06/2024 Service Body Rear Lighting Options (including LEDs)
80 09/15/2014 Power Take Off (PTO) Subsystem Operating Description and Application Guide
79 01/07/2013 Power Take Off (PTO) Features (New 900)
51 01/27/2021 Professional Vehicle - XT5 Steering Learn Procedure
50 12/27/2020 Profession Vehicle - XT5-Hearse and Limo EBCM Calibration part numbers
49 01/27/2021 Professional Vehicle - Hearse and Limo exterior molding color specifications
48 10/29/2018 2017 MY XTSPRO Fuel Economy Ratings and Emission Documentation
47 08/20/2018 Professional Vehicle - 2018 XTS B9Q Funeral Coach Excessive Current Drain
46 08/20/2018 Professional Vehicle - Rear Applique Assembly (with Rear Camera) for 2018 XTS B9Q Funeral Coach
45 08/20/2018 Professional Vehicle - 2018 MY XTSPRO Fuel Economy Ratings and Emission Documentation
44 08/20/2018 Professional Vehicle - 2017 MY XTSPRO Fuel Economy Ratings and Emission Documentation
43 08/20/2018 2016 XTSPRO Build Out and 2017 Start Up
43 08/20/2018 Professional Vehicle - 2016 XTSPRO Build Out and 2017 Start Up
42 08/20/2018 Professional Vehicle - MY 2016 XTSPRO Fuel Economy Ratings and Emission Documentation
41 08/20/2018 Professional Vehicle - Updated CMC Converter Guidelines Manual
40 08/20/2018 Professional Vehicle - 2015 XTSPRO Build Out and 2016 Start Up
39 08/20/2018 Professional Vehicle - Vehicle Labeling Clarifications
38 08/20/2018 Professional Vehicle - New Alignment Specifications for W30 Extended Sedan
37 08/20/2018 Professional Vehicle - New Underbody Braces on 2015 XTSPRO Vehicles
36 08/20/2018 CMC Export Contact at IFS
35 08/20/2018 MY 2015 XTS_PRO Fuel Economy Ratings and Emission Documentation
34 08/20/2018 Overseas Sales Requests and International Fleet Sales (IFS)
33 08/20/2018 Professional Vehicle - Corrected GVWR/GAWR incomplete vehicle labels on Manufacturer’s Information and Incomplete Vehicle Documentation
32 08/20/2018 Professional Vehicle - UPDATE – 2014 XTS_PRO Order Cutoff and 2015 Start Up
31 08/20/2018 Updated CMC Converter Guidelines Manual
30 08/17/2018 Oshawa Down Weeks; 2014 MY Order Cutoff and 2015 MY Order Start Dates
29 08/17/2018 Electrical System Requirement for V4U, B9Q, W30 & B05
28 08/17/2018 Rear Vision Camera Kit for 2015 XTS B9Q Hearse
27 08/17/2018 Mercury Information Label
26 08/17/2018 CMC Order Processing
25 08/17/2018 2014 XTSPRO Production
24 08/17/2018 XTS Professional Vehicle VINs
23 08/17/2018 CMC Export Contact
22 08/17/2018 MY 2014 XTS Fuel Economy Ratings and Emission Documentation
21 08/17/2018 Contact Information Change
20 08/17/2018 Cadillac XTS ECS Programing Process
19 08/17/2018 2014 MY Oshawa Build Schedule
18 08/17/2018 Cadillac PV Wheel Alignment Specifications
17 08/17/2018 Cadillac PV Paint on B9Q Chassis
16 08/17/2018 2013 MY Ordering Cutoff and 2014 MY Ordering Date
15 08/17/2018 Emissions RPO codes
14 08/17/2018 Math Data Request
13 08/17/2018 Cadillac Master Coachbuilder Converter Guidelines Manual
12 08/17/2018 MY 2013 XTS Fuel Economy Ratings and Emission Documentation
11 08/17/2018 FINAL CMC Converter Guidelines Manual
10 08/15/2018 Escalade Product Portfolio and Color Chart
9 08/15/2018 Canadian Export
8 08/15/2018 Revised CMC Policy & Procedure Manual
7 08/15/2018 GM Tool Usage Letter
6 08/15/2018 XTS Parts and Supplier Contact
5 08/15/2018 CMC Export Contact
4 08/15/2018 XTS Interior and Exterior Colors Specific PV Colors
3 07/27/2018 XTS Interior and Exterior Color samples
2 07/27/2018 CMC Converter Guidelines Manual
1 07/27/2018 Revised CMC Policy & Procedure Manual














206

10/30/2025

Information on Hesitation and/or Misfire Sensation When Passing Under High Voltage Transmission (Power) Lines - Multiple Intermittent ABS DTCs Set







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