2021 Oshkosh S-Series problems, complaints & recalls
Updated from NHTSA data · How we count
No owner complaints are on file for the 2021 Oshkosh S-Series yet. There are 7 recalls for this model year.
- Complaints
- 0
- Recalls
- 7
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Median mileage
- — at time of problem
Key facts
- The 2021 Oshkosh S-Series has 7 recalls on file.
2021 Oshkosh S-Series recalls (7)
- ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR
Oshkosh Corporation (Oshkosh) is recalling certain 2019-2022 S-Series 2.0 Concrete Mixers. Incorrectly installed alternator electrical cable clamps may rub against the vehicle frame or hydraulic hose, possibly damaging the alternator cables.
Risk: Damaged alternator electrical cables can increase the risk of a fire.
Remedy: Oshkosh will provide instructions on how to inspect the wiring, reposition the clamps, and properly secure the cables. The repair can be performed by the owner or an Oshkosh service center, free of charge. Owner notification letters were mailed on June 23, 2022. Owners may contact Oshkosh's customer service at 1-888-686-7278.
- SUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY:U-BOLT, LEAF SPRING TO AXLE · SUSPENSION:MULTIPLE AXLE
Oshkosh Corporation (Oshkosh) is recalling certain 2019-2022 S-Series vehicles. The u-bolts securing the front axle may fail.
Risk: Bolt failure may allow the front axle to shift or detach, increasing the risk of a crash.
Remedy: Oshkosh will provide new u-bolts, free of charge. Owner notification letters were mailed February 24, 2022. Owners may contact Oshkosh customer service at 1-888-686-7278.
- FUEL SYSTEM, DIESEL:FUEL INJECTION SYSTEM:FUEL RAIL
Oshkosh Corporation (Oshkosh) is recalling certain 2019-2022 S-Series vehicles. The fuel 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 leak.
Risk: A high pressure fuel leak in the presence of an ignition source may increase the risk of a fire.
Remedy: On engines with 75 miles or less, dealers will install vibration isolators to the fuel tubes. Engines with more than 75 miles will receive new fuel tubes with vibration isolators. Repairs will be performed free of charge. Owner notification letters are expected to be mailed February 1, 2022. Owners may contact Oshkosh customer service at 1-8088-686-7278.
- STEERING:HYDRAULIC POWER ASSIST:PUMP
Oshkosh Corporation (Oshkosh) is recalling certain 2020-2021 S-Series vehicles. A machining defect may cause pressure to build in the power steering pump and break the shaft seal, resulting in a loss of power steering assist.
Risk: A loss of power steering assist increases the risk of a crash.
Remedy: Owners will inspect and replace the power steering pump as necessary. Owners may perform this work themselves or reach out to one of our service centers to perform the inspection and repair work free of charge. Owner notification letters were mailed on December 15, 2021. Owners may contact Oshkosh customer service at 1-888-686-7278.
- ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS
Oshkosh Corporation (Oshkosh) is recalling certain 2019-2022 S-Series vehicles. These vehicles were manufactured with 10 amp Anti-Lock Brake System (ABS) fuses, instead of the required 15 amp ABS fuses.
Risk: The incorrectly sized fuse may blow during an ABS braking event, increasing the risk of a crash.
Remedy: Oshkosh will provide owners new fuses, a new fuse label, and installation instructions, free of charge. Owner notification letters were mailed on July 29, 2021. Owners may contact Oshkosh customer service at 1-888-686-7278.
- SUSPENSION:MULTIPLE AXLE
Oshkosh Corporation (Oshkosh) is recalling certain 2021 S-Series vehicles. The auxiliary axles may not have been properly secured and may detach.
Risk: A detached axle may cause a loss of vehicle control, increasing the risk of a crash.
Remedy: A technician will inspect and, as necessary, replace any improperly installed fasteners, free of charge. Owner notification letters were mailed on May 26, 2021. Owners may contact Oshkosh customer services at 1-888-686-7278.
- POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:SHAFT:OUTPUT · POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:SHAFT:OUTPUT
Oshkosh Corporation (Oshkosh) is recalling certain 2020-2021 S-Series vehicles. The rear axle output shaft may not have been heat-treated properly, which could cause the shaft to fracture.
Risk: A fractured rear output shaft may cause the shaft or interaxle driveline to detach from the vehicle, increasing the risk of a crash or injury.
Remedy: Oshkosh will notify owners, and owners will be instructed to inspect the output shaft, and if necessary, order a new one and replace it, free of charge. The recall began on March 31, 2021. Owners may contact Oshkosh customer service at 1-888-686-7278.
Recent 2021 Oshkosh S-Series complaints
Excerpts of the newest owner complaints, lightly cleaned of personal details. Complaints are unverified owner reports.
No narrative complaints on file.
Compare the 2021 Oshkosh S-Series with another vehicle →
Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data, as of Oct 11, 2026. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology