NHTSA ID Number: 10198592
Manufacturer Communication Number: SB54-338
TSB/Document Date: 2021-06-29
Summary
Updated Freightliner
Service Bulletin for Updating HVAC ECU Software to Fix Front HVAC Evaporator Freezing and Improve Espar Heater Cool Down. This bulletin replaces the version dated 03/03/2021. Information on software versions and the number of software updates needed has been updated.
Updating HVAC ECU Software to Fix Front HVAC
Evaporator Freezing and Improve Espar Heater Cool Down
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
54-338
Freightliner
Service Bulletin
Description of Revisions: This bulletin replaces the version dated
03/03/2021. Information on software versions and the number of
software updates needed has been updated.
General Information
New Cascadia vehicles with sleeper cabs may become extremely cold when in A/C mode, which can lead to
reduced airflow as a result of internal ice buildup at the evaporator.
Conditions that contribute to the front evaporator freezing include:
• Engine at 900 rpm and above, typically noticed when vehicle is moving at 60 mph (97 km/h) or more.
• Air conditioning in recirculation mode; the front evaporator may freeze in ECO mode but it will take much
longer.
• Blower motor operating at 50% power or above.
• Temperature control knob turned to the full cold setting.
• Ambient temperature approximately 86°F (30°C) or above.
• Humidity at 75% or higher.
There are also issues with the durability of the Espar D5 heater system when paired with the battery parked
HVAC system (BPHS). This can be improved by applying "cool down" software to the parked electronic control
unit (ECU) HVAC_P01T.
The front evaporator freezing issue is addressed by the new software available for the front ECU HVAC_F01T
and auxiliary ECU HVAC_R01T.
This software is now available and should be installed. The software is backwards compatible for all ECUs.
Each vehicle will require the software updates listed.
For vehicles without a BPHS or ParkSmart unit, install the software listed below. If a newer version of the
software listed is available, install that.
Software for Vehicles Without a BPHS or ParkSmart Unit
Controller
Flashware Item
Dataset Item
F01T
001 448 14 28 001
001 448 05 28 001
R01T
001 448 07 28 001
001 448 08 28 001
Table 1, Software for Vehicles Without a BPHS or Parksmart Unit
For vehicles with a BPHS, install the software listed below. If a newer version of the software listed is available,
install that.
Controller
F01T
R01T
P01T
Software for Vehicles With a BPHS
Flashware Item
Dataset Item
001 448 14 28 001
001 448 05 28 001
001 448 07 28 001
001 448 08 28 001
000 448 70 28 007
N/A
Table 2, Software for Vehicles With a BPHS
Freightliner Service Bulletin, 03/23/2021
Page 1
54-338
Updating HVAC ECU Software to Fix Front HVAC
Evaporator Freezing and Improve Espar Heater Cool Down
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
For vehicles with a ParkSmart unit, install the software listed below. If a newer version of the software listed is
available, install that.
Controller
F01T
R01T
P01T
Software for Vehicles With a ParkSmart Unit
Flashware Item
Dataset Item
001 448 14 28 001
001 448 05 28 001
001 448 07 28 001
001 448 08 28 001
000 448 68 28 003
N/A
Table 3, Software for Vehicles With a ParkSmart Unit
After the HVAC_P01T software has been updated, drivers may notice the Espar combustion chamber fan and
coolant pump running for approximately three minutes after the Espar D5 heater has turned off.
General Information
There are two different procedures for programming chassis ECUs with DiagnosticLink:
• Updating functioning vehicle chassis ECUs by uploading the parameters of the vehicle’s ECUs to the
server and then downloading these parameters with the updated software.
• Overwriting the parameters and software installed on the ECU with the most recent parameter sets and
software from the server by directly using ’Program Device.’
This service bulletin will use the second procedure to program the HVAC ECUs.
Procedure
1. Park the vehicle on a level surface, shut down the engine, and apply the parking brakes. Chock the tires.
2. Connect the vehicle to DiagnosticLink. Ensure DiagnosticLink is updated to the latest version (8.13 at the
time of publication) or newer. To update DiagnosticLink, select ’Tools’ from the top menu and then select
’Update’ from the dropdown menu. See Fig. 1.
Page 2
Freightliner Service Bulletin, 03/23/2021
Updating HVAC ECU Software to Fix Front HVAC
Evaporator Freezing and Improve Espar Heater Cool Down
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
Freightliner
Service Bulletin
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
01/15/2021
54-338
f120507
Fig. 1, Updating DiagnosticLink to the Latest Version
2.1
When programming, we recommend configuring DiagnosticLink to connect only to ’Default’ ECUs.
To make this change in DiagnosticLink:
• Select ’Tools’ from the top menu, and then select ’Options’ from the drop down menu.
• Find and select the ’Connection’ tab. See Fig. 2.
• Select the ’Select Defaults’ button on the right side of the window, then select ’Apply.’
Freightliner Service Bulletin, 03/23/2021
Page 3
54-338
Freightliner
Service Bulletin
Updating HVAC ECU Software to Fix Front HVAC
Evaporator Freezing and Improve Espar Heater Cool Down
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
1
2
3
02/01/2021
f120850
1. ’Connection’ Tab
2. ’Select Defaults’ Button
3. ’Apply’ Button
Fig. 2, Configuring DiagnosticLink to Connect to Default ECUs
3. Address any pre-existing conditions or fault codes.
NOTE: In DiagnosticLink an ECU is called a ’device.’
4. Select ’Program Device’ from the upper left-hand side of the window. See Fig. 3.
02/01/2021
f120466a
Fig. 3, Selecting Program Device (ECU)
Page 4
Freightliner Service Bulletin, 03/23/2021
Updating HVAC ECU Software to Fix Front HVAC
Evaporator Freezing and Improve Espar Heater Cool Down
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
54-338
Freightliner
Service Bulletin
5. Remove any ’Request Pending’ downloads and serial numbers in the main window by selecting the
’Request Pending’ list item(s) and then selecting the ’Remove’ button on the right-hand side of the window.
Do not select ’Remove All;’ selecting ’Remove All’ deletes all data pending upload. See Fig. 4.
02/04/2021
f120463a
Fig. 4, Removing Pending Requests
6. Use your DTNAConnect information to connect to the server. Your sign-in to the server will remain active
until DiagnosticLink is closed.
7. Select ’Add’ to add a download request for the vehicle by entering the vehicle identification number (VIN).
See Fig.5.
01/15/2021
f120841
Fig. 5, Adding the VIN to Download Updated Server Data
8. Make sure the correct VIN is populated in the window, then select ’OK.’ See Fig. 6.
Freightliner Service Bulletin, 03/23/2021
Page 5
54-338
Freightliner
Service Bulletin
Updating HVAC ECU Software to Fix Front HVAC
Evaporator Freezing and Improve Espar Heater Cool Down
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
- Advanced VCI Box, Industry-leading J2534 Pass-Thru...
- High-Speed OEM-Level Diagnostics & Programming: Unlock true...
- Coverage for 17 Car Brands & Ultra Reliability: Works...
- User-Friendly RLink Platform & Expert Support: TOPDON’s...
- 6.6 ft USB-C Cable & Portable Storage Case: The RLink J...
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
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: SB54-338
Replacement Service Bulletin Number:
MFR Communication Date: 2021-03-23
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VISIBILITY
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.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- 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
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅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.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.