Service bulletin 21TS-04
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 | 10187836 |
| Published by NHTSA | 2021-03-02 |
| Manufacturer's number | 21TS-04 |
| Manufacturer's date | 2021-02-19 |
| NHTSA component | ENGINE AND ENGINE COOLING |
NHTSA's summary
Technical Service Letter for Gen 5 DD15 Instrument Panel Oil Pressure Gauge Operation. Gen 5 DD15 equipped units have been brought in for service with a complaint of the instrument panel oil pressure gauge not moving during unit operation and/or stuck at 50PSI. The instrument panel oil pressure gauge does not operate the same as with previous engine models. Please be advised, this is normal operation and no further diagnostics are required. Do not down a unit for this complaint.
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
| FREIGHTLINER 122SD | 2020 to 2021 |
|---|---|
| FREIGHTLINER CASCADIA | 2020, 2021 |
| WESTERN STAR 4900 | 2020, 2021 |
| WESTERN STAR 49X | 2021 |
| WESTERN STAR 5700 | 2020, 2021 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 21V073000 | 2021-02-12. 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 |
| 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 |
| CXA 3_25_NOx | 2025-04-02. Other. CX Advocate for NOx conversion low faults |