NHTSA ID Number: 11014713
Manufacturer Communication Number: S4437- 202502
TSB/Document Date: 2025-03-03
Summary
Mack Trucks
has identified that certain MMDE model trucks may encounter charging issues when using a Heliox brand charger.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
Service Category Service Department
Section Function Group 360
Technician Skill Level A
Market: North America
Applicability
Mack
Model Years
2024-2025
Models
MMDe
Introduction
Mack Trucks has identified that certain MMDE model trucks may encounter charging
issues when using a Heliox brand charger. To address this, a General Vehicle Control Unit
(GVCU) software update has been developed. Please refer to the instructions in this
document to install the update.
Production Change Information
This bulletin applies to vehicles built within the specified production changes below.
Brand
Engine
Emission Level Starting Build Date Ending Build Date
Mack
BEV
EM-ZE
21-June-2023
24-October-2024
Warranty Information
This repair is covered by an authorized Service Program.
Reimbursement is obtained through the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus. Sys.)
B
Main Labor Code
Description
Hours
1720-16-09-01
Campaign, General 0.1x10
1.0
Causal Part
SCC Authorization
Code
24444477
Expiration Date
February 28, 2026
S4437
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
Required Software Application
To update the GVCU software, you’ll need an application called cvFlash. If you haven’t
already downloaded it to your PC, please access the cvFlash file and download
instructions in the Trucks Dealer Portal. The images below show where to find the files
in TDP.
Service Campaign S4437
Mack MMDE GVCU Software
February 2025
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
Required Tools and Equipment
All tools and equipment listed below are essential tools for BEV dealers. If you do not
already have them, they can be ordered through Parts LinQ. Dealer is responsible for
essential tool cost and will NOT be covered by this campaign.
Description
Part Number
CV Flash License
88800874
PCAN USB Dongle
88800873
PCAN Harness
88800876
SEA Diagnostic Harness
88800877
Image
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
eService Case
To receive the software file for the GVCU you will need to create an eService case under
Emobility Technical Support. Please include the following
• Campaign number SXXXX and title (Mack MMDE GVCU Software).
• VIN number.
Important Note
An eService case is required for every truck, even if your dealer is performing this campaign
on multiple trucks.
Important Note
Note the title of the received file and save to a known location on you PC where you can
easily access.
Repair Procedure
Important Note
Before proceeding with the repair, ensure you have the cvFlash application, all needed
equipment, and have received the software file from eService.
1.
2.
3.
4.
5.
Park the vehicle on a level surface.
Apply parking brake.
Place the transmission in park or neutral.
Turn off the ignition.
Install wheel chocks.
6. Connect the cvFlash license flash drive to your PC.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
7. Connect the PCAN USB dongle to your PC.
8. Connect the PCAN harness to the PCAN box.
9. Connect the other side of the PCAN harness to the connector labeled CAN 1 on SEA
diagnostic harness.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
10. Remove the access panel.
11. Locate the 12 pin SEA diagnostic plug located inside of the access panel.
Important Note
If you cannot locate the SEA diagnostic connector via the access panel, removal of the kick
panel may be necessary.
12. Connect the diagnostic plug to the SEA diagnostic harness.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
13. Open cvFlash on your PC.
14. Open the File tab and click on Open Project Package.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
15. Locate and select the save file received from eService.
16. You should now see the ‘Flash Run’ sub-menu populated with information. If no
information is populated, repeat steps 14 and 15.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
17. Confirm that the drop-down menu next to “Initial” (Outlined in red below) is set to
500000.
18. Select the Comm. Config tab.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
19. Ensure that UDSonCAN is selected in the “Protocol” drop-down, and PCAN USBBUS is
selected in the “Port” drop-down.
20. Click “Refresh Ports”.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
21. Check to ensure that the canDeviceTxID and canDeviceRxID values in the “Driver” tab
are correct. They should both begin with 0x18. If you see 0x98, change the nine to a
one.
22. Select the Flash Run tab.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
23. Turn the ignition key to the “ON” position.
24. Select “Start” in the Flash Run tab.
Service Campaign S4437
February 2025
Mack MMDE GVCU Software
25. Once the flash procedure has started, a progress bar will appear. Pictured below.
26. Once the status bar has reach 100% the message “Validating Download” will appear
above the status bar (Image One). DO NOT exit at this point. The flashing procedure is
not complete until the status bar goes away and the message “Download completed
Successfully” appears in the bottom lefthand corner (Image Two).
Service Campaign S4437
Mack MMDE GVCU Software
27. Exit cvFlash.
28. Turn ignition key off.
29. Wait 10 seconds.
30. Turn ignition key on.
February 2025
Service Campaign S4437
Mack MMDE GVCU Software
31. Remove the wheel chocks.
32. Release the truck.
February 2025
- ALL-IN-ONE HEAVY-DUTY DIAGNOSTIC PLATFORM FOR PROFESSIONAL...
- 42+ SERVICE & RESET FUNCTIONS FOR DAILY MAINTENANCE JOBS...
- ADVANCED BI-DIRECTIONAL CONTROL & ACTIVE TESTING CAPABILITY...
- ECU CODING & MODULE MATCHING FOR POST-REPAIR CALIBRATION...
- FULL-SYSTEM HDOBD/OBD2 DIAGNOSTICS WITH WIDE COVERAGE...
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: S4437- 202502
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Campaign
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford, for Lincoln, and for Mazda ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
This product presentation was made with AAWP plugin.