AI Damage2020 Oshkosh S-Series: common problems
The maker issued 38 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 38
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 13 |
| Equipment | 0 | 0 | 10 |
| Powertrain | 0 | 0 | 4 |
| Steering | 0 | 0 | 3 |
| Engine | 0 | 0 | 2 |
| Engine and cooling | 0 | 0 | 1 |
| Fuel system | 0 | 0 | 1 |
| Parking brake | 0 | 0 | 1 |
| Suspension | 0 | 0 | 1 |
| Other | 0 | 0 | 9 |
Comparison
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- This bulletin provides instructions for the inspection, weld repair, and installation of reinforcement…
This bulletin provides instructions for the inspection, weld repair, and installation of reinforcement brackets on the exhaust mast of Oshkosh 2.0 S-Series trucks.
- This bulletin provides instructions for identifying and locating all driveline grease zerk fittings
Lubrication of the driveline is important for proper vehicle operation.
- 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.
- This bulletin provides instructions to install a check valve in the chute return hydraulic circuit to…
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…
- This bulletin provides instructions to install the latest battery disconnect switch on S-Series 2.0…
This bulletin provides instructions to install the latest battery disconnect switch on S-Series 2.0 vehicles in serial number range 788727 - 814085.
- This bulletin provides information on verifying powertrain harness grounds are correctly installed, and…
This bulletin provides information on verifying powertrain harness grounds are correctly installed, and covers the installation of an optional engine ground cable.
- This bulletin provides information on making sure the dedicated ground from the battery negative to the…
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…
- This bulletin provides information on installing metal door linkage rod clips in place of original plastic…
- This bulletin provides instruction for installing an updated water meter
- This bulletin provides instruction for replacing a Micronet display with an updated Grayhill overhead…
- This bulletin provides instructions for performing an Over The Air Programming (OTAP) vehicle software update
- This bulletin provides instructions to seal around the HVAC fresh air intake and drains ports, and install…
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.
NHTSA lists 38 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 Oshkosh S-Series?
There are no owner complaints in the NHTSA data for this year; the data comes from 38 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2020 Oshkosh S-Series?
NHTSA lists 38 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 Oshkosh S-Series from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.