Service bulletin FL974
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
| Type | Service bulletin |
|---|---|
| NHTSA id | 10251200 |
| Published by NHTSA | 2024-03-06 |
| Manufacturer's number | FL974 |
| Manufacturer's date | 2024-02-20 |
| NHTSA component | ENGINE AND ENGINE COOLING |
NHTSA's summary
Revised Emissions Recall: Cummins DEF Sensor Shortage. REVISION: Some vehicles formerly in Group F have been moved to Group G and have been assigned a new part number as specified in Table 1. An SRT for 'Calibration Code Only: Update or Confirm' has been added, as shown in Table 2, to be used when a new DEF header is not required. There have been some other minor changes to the work instructions and SRT times.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Engine
| FCCC MB | 2019 |
|---|---|
| FCCC MT45 | 2016 to 2022 |
| FCCC MT55 | 2016 to 2022 |
| FCCC S2C | 2018 to 2022 |
| FCCC S2RV | 2017 to 2022 |
| FCCC XBA | 2019 to 2020 |
| FCCC XBP | 2016 to 2021 |
| FCCC XBR | 2016 to 2021 |
| FCCC XBS | 2016 to 2022 |
| FCCC XCL | 2016 to 2021 |
| FCCC XCM | 2016 to 2022 |
| FCCC XCP | 2016 to 2021 |
| FCCC XCR | 2016 to 2022 |
| FCCC XCS | 2016 to 2022 |
| FREIGHTLINER 108SD | 2016, 2017, 2018, 2019, 2020, 2021, 2022 |
| FREIGHTLINER 114SD | 2016, 2017, 2018, 2019, 2020, 2021, 2022 |
| FREIGHTLINER 122SD | 2016 to 2022 |
| FREIGHTLINER BUSINESS CLASS M2 | 2016 to 2022 |
| FREIGHTLINER CASCADIA | 2016, 2017, 2018, 2019, 2020, 2021, 2022 |
| THOMAS BUILT BUSES SAF-T-LINER C2 | 2016 to 2022 |
| THOMAS BUILT BUSES SAF-T-LINER EFX | 2016 to 2022 |
| THOMAS BUILT BUSES SAF-T-LINER HDX | 2016 to 2022 |
| WESTERN STAR 4700 | 2016, 2017, 2018, 2019, 2020, 2021, 2022 |
| WESTERN STAR 4900 | 2016, 2017, 2018, 2019, 2020, 2021, 2022 |
| WESTERN STAR 49X | 2017 to 2022 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 21V715000 | 2021-09-15. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM |
|---|---|
| 21V073000 | 2021-02-12. ENGINE |
| 2020408 | 2020-09-01. Engine |
| 20V527000 | 2020-09-01. ELECTRICAL SYSTEM:WIRING; ENGINE AND ENGINE COOLING |
| 18V581000 | 2018-08-30. ENGINE AND ENGINE COOLING:ENGINE:DIESEL |
| 16V416000 | 2016-06-09. ENGINE AND ENGINE COOLING:ENGINE:DIESEL |
| 2016285 | 2016-06-06. Engine |
| 2015484 | 2015-10-16. Engine |
| 15V620000 | 2015-10-02. ELECTRICAL SYSTEM:IGNITION:MODULE; ENGINE AND ENGINE COOLING:ENGINE |
| 2015336 | 2015-07-24. Engine |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| CXA 03_26_Surge Tank | 2026-04-02. Other. CX Advocate for discolored coolant surge tanks (24CSA-20) |
|---|---|
| FleetCom_Heater Core | 2026-01-08. Other. Fleet Communications for Heater Core Plugging |
| TSB54-377-FTL | 2026-01-07. Service bulletin. Technical Service Bulletin Low Coolant Sensor |
| FleetCom_SS 3163-FTL | 2025-12-06. Other. Fleet Communications for Power Steering Reservoir Fill Cap Venting |
| FleetCom_Low Coolant | 2025-12-05. Other. Fleet Communications for Low Coolant Sensor |
| CXA_10_25_Low Coolant | 2025-11-05. Other. CX Advocate for P4, WST X-Series, DD Engines Low/Critical Low Coolant Warnings |
| CXA_10_25_Conmet Oil Pan | 2025-11-05. Other. CX Advocate for ConMet Oil Pan Insert Additional Issues |
| CXA_9_25_Tech Questions | 2025-10-03. Other. CX Advocate for technical questions/issues raised |
| CXA_8_25_Tech Questions | 2025-09-02. Other. CX Advocate for technical questions/issues raised |
| 24CSA-19Rev | 2025-09-02. Other. Revised Customer Service Annoucement for No Trouble Found Heavy Duty Engine Product (HDEP) Oil Separator Leaks |