AutoStatsIQ
Data through Oct 2026
Model year

2021 Oshkosh S-Series

Body and fuel not decoded. Owner complaints on file from no date to no date.

Recalls (7)Complaints (0)Investigations (0)Bulletins (28)
Recall campaigns covering this model year75,852 vehicles or units across those campaigns
Owner complaints0Not enough peers on file
Severity indexNoneCrash, fire, injury or death per 100
First 24 months0Complaints in its first two years
Complaints over time

Complaints about the 2021 Oshkosh S-Series by year filed

Owner complaints about this model year, by the year they were filed with NHTSA.

No campaigns match these filters.Reset filters
Source: NHTSA ODI complaints file. The lighter column runs through October.
Components

Complaints by component

Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.

No campaigns match these filters.Reset filters
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls

7 recall campaigns cover the 2021 Oshkosh S-Series

Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.

Recall campaigns for the 2021 Oshkosh S-Series
CampaignFiledSubjectComponentVehiclesRemedy
22V-378May 26, 2022Incorrectly installed alternator electrical cable clamps may rub against the vehicle frame or hydraulic hose, possibly damaging the alternator cablesElectrical system1,316Repair or modification
22V-009Jan 11, 2022U-bolts securing the front axle may failSuspension1,268Not stated
22V-008Jan 11, 2022Fuel tubes between the fuel rail and the injector for cylinders 4, 5 and 6 may be susceptible to cracking, resulting in a high pressure fuel leakFuel system1,608Repair or modification
21V-851Nov 2, 2021Machining defect may cause pressure to build in the power steering pump and break the shaft seal, resulting in a loss of power steering assistSteering697Part replacement
21V-482Jun 27, 2021These vehicles were manufactured with 10 amp Anti-Lock Brake System (ABS) fuses, instead of the required 15 amp ABS fusesElectrical system897Repair or modification
21V-322May 6, 2021Auxiliary axles may not have been properly secured and may detachSuspension47Part replacement
21V-125Feb 26, 2021Rear axle output shaft may not have been heat-treated properly, which could cause the shaft to fracturePowertrain19Part replacement
Source: NHTSA ODI recalls file.
Look up a VIN at NHTSA
Owner complaints

What owners reported about the 2021 Oshkosh S-Series

The full text of every complaint filed with NHTSA about this model year, newest first. Complaints are filed by owners and are not verified by NHTSA; NHTSA removes personal details before publishing.

0 complaints on file.

    Source: NHTSA ODI complaints file.
    Investigations

    NHTSA has not opened an investigation on this model year

    Source: NHTSA ODI investigations file.
    All investigations
    Service bulletins

    28 manufacturer communications cover this model year

    Technical service bulletins and other notices the manufacturer sent to dealers. A bulletin is not a recall.

    • FDM-IB-016 Aug 18, 2026 · Other
      This bulletin provides instructions for identifying and locating all driveline grease zerk fittings. Lubrication of the driveline is important for proper vehicle operation.
    • FDM-IB-013 Mar 1, 2026 · Other
      This bulletin provides instruction for replacing the existing chute drive washer with a hardened steel washer. This change prolongs the service life of the drive sprocket and chute operation.
    • FDM-SVC-044 Mar 25, 2026 · Other
      This bulletin provides instructions to install a check valve in the chute return hydraulic circuit to prevent fluid back flow through the chute manifold if a chute up or down hose fails, and install a shut-off valve on the fan manifold to turn off flow of h…
    • FDM-SVC-045 May 13, 2026 · Other
      This bulletin provides instructions to install the latest battery disconnect switch on S-Series 2.0 vehicles in serial number range 788727 - 814085.
    • FDM-IB-011 Dec 19, 2025 · Service Bulletin/Repair Instructions
      This bulletin provides information on verifying powertrain harness grounds are correctly installed, and covers the installation of an optional engine ground cable.
    • FDM-IB-011 Sep 2, 2025 · Service Bulletin/Repair Instructions
      This bulletin provides information on making sure the dedicated ground from the battery negative to the engine block ground stud remains installed when a powertrain harness is replaced. Service personnel have found instances of this ground cable not being…
    • FDM-IB-010 Aug 20, 2025 · Service Bulletin/Repair Instructions
      This bulletin provides information on installing metal door linkage rod clips in place of original plastic clips.
    • FDM-SVC-042 May 19, 2025 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for installing an updated water meter.
    • FDM-SVC-027 Jun 2, 2025 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for replacing a Micronet display with an updated Grayhill overhead display and T27 TCU.
    • FDM-IB-006 Oct 17, 2024 · Service Bulletin/Repair Instructions
      This bulletin provides instructions for performing an Over The Air Programming (OTAP) vehicle software update.
    • FDM-SVC-040 Jul 11, 2024 · Service Bulletin/Repair Instructions
      This bulletin provides instructions to seal around the HVAC fresh air intake and drains ports, and install a deflector bracket to prevent water ingress into the cab.
    • FDM-SVC-039 Jul 16, 2024 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for updating the Medallion instrument cluster software version to a new version updating the high transmission temperature icon and alarm to match the Allison high-temp fault settings. The alarm activates when the TCM dete…
    • FDM_TSIB-047 Nov 7, 2023 · Service Bulletin/Repair Instructions
      This bulletin provides instructions for installing rubber hose STAUFF clamps in areas of the vehicle that have hard line STAUFF clamps installed on rubber hoses. Rubber hose STAUFF clamps have a smooth inner contact surface and filleted edges. Installin…
    • FDM-TSIB-046 Nov 7, 2023 · Service Bulletin/Repair Instructions
      This bulletin provides instructions for installing new updated front shock absorbers and upper mounting brackets. The updated shock absorber and mounting bracket lowers the top of the shock absorber improving the allowable maximum travel of the front le…
    • FDM-SVC-030 Oct 3, 2023 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for installing a hydraulic system charge pump filter.
    • FDM-TSIB-043 Jul 24, 2023 · Service Bulletin/Repair Instructions
      This bulletin provides information on updating hydraulic hose clamping below the cab to match current production. Engineering recommends changing out the front STAUFF clamp using the following procedure. The second STAUFF clamp can be changed out using th…
    • FDM-TSIB-041 Apr 5, 2023 · Service Bulletin/Repair Instructions
      This bulletin provides information on topics specific to transmission high temperature warnings reported in the field. The topics listed were helpful in preventing transmission high temperature warning conditions.
    • FDM-SVC-028 Feb 21, 2023 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for installing an updated cab door switch.
    • FDM-TSIB-039 Dec 22, 2022 · Service Bulletin/Repair Instructions
      This bulletin provides instruction on replacing PDM power bank fuses in the cab, mixer, and rear PDMs. The larger 15 amp fuse protects the system and keeps the whole BCM Bank from dropping out if a bank function shorts-to-ground.
    • FDM-TSIB-012 Apr 13, 2022 · Service Bulletin/Repair Instructions
      The following procedure provides instruction for Fleet Managers to access their vehicle system to: Set the fleet password. Unlock delivery mode. (The fleet password must be entered to unlock delivery mode) Begin a LSTA calibration. (if LSTA equipped) En…
    • FDM-TSIB-028 Jan 26, 2022 · Service Bulletin/Repair Instructions
      The following procedure provides instruction for Fleet Managers to access their vehicle system to change parameters.
    • FDM-TSIB-012 Jan 26, 2022 · Service Bulletin/Repair Instructions
      The following procedure provides instruction for Fleet Managers to access their vehicle system change parameters.
    • FDM-TSIB-027 Jun 23, 2021 · Service Bulletin/Repair Instructions
      This bulletin provides information for vehicle owners that have a Dana series 172 or 175 rear axle without a lubricant drain plug in the bottom of the axle housing.
    • FDM-TSIB-026 Jun 16, 2021 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for replacing the mixer pump PTO shaft, mixer pump input yoke, and mixer pump input yoke bearing U-bolts to the current production configuration. The new PTO shaft is larger with greaseable crosses and requires a new mix…
    • FDM-TSIB-025 Jun 14, 2021 · Service Bulletin/Repair Instructions
      This bulletin provides instructions for bolting the water tank mounting feet to the water tank if the bonded feet become loose.
    • FDM-SVC-002 Jun 28, 2021 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for replacing the water pump impeller due to corrosion. Oshkosh has received reports of non-working water pumps due to the pump impeller becoming corroded and seized, causing the pump not to spin. A new impeller made of …
    • FDM-TSIB-024 May 12, 2021 · Service Bulletin/Repair Instructions
      This bulletin provides instruction for checking electrical connections at various critical locations. Loose electrical connections can cause false readings and lead to electrical system errors.
    • FDM-TSIB-023 May 4, 2021 · Service Bulletin/Repair Instructions
      This bulletin provides instruction on replacing the frame ground stud nut located at the rear of the vehicle on the inside right-hand frame rail. Engineering has changed the nut from a jam nut to a lock nut after receiving reports of the jam nut being loo…
    Source: NHTSA manufacturer communications files.
    About service bulletins