# Service bulletin SF599

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: 10174984
- Published by NHTSA: 2020\-05\-14
- Manufacturer's number: SF599
- Manufacturer's date: 2020\-05\-13
- NHTSA component: ENGINE AND ENGINE COOLING; POWER TRAIN

## NHTSA's summary

Field Service Campaign for Allison Transmission Flex Plate Bolts. On certain vehicles with DD13 engines, incorrect bolts were installed in the flex plate. The flex plate bolts will be replaced.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174984-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174984-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Transmission and driveline

## Vehicles listed

- 2020 FREIGHTLINER 114SD
- 2020 FREIGHTLINER 122SD
- 2020 FREIGHTLINER BUSINESS CLASS M2

## Recalls for the same vehicles and component

- [2020408](/recalls/tc/2020408.md), 2020-09-01: Engine
- [20V527000](/recalls/nhtsa/20V527000.md), 2020-09-01: ELECTRICAL SYSTEM:WIRING; ENGINE AND ENGINE COOLING

## Other bulletins for the same vehicles and component

- [FleetCom\_Oil Plug Loc](/bulletins/11027500.md), 2026-01-08, Other: POWER TRAIN. Fleet Communications for NFD Lower Oil Plug Location \- SP Axles
- [FleetCom\_Heater Core](/bulletins/11027493.md), 2026-01-08, Other: ENGINE. Fleet Communications for Heater Core Plugging
- [CXA\_10\_25\_Conmet Oil Pan](/bulletins/11024958.md), 2025-11-05, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Issues
- [CXA 3\_25\_NOx](/bulletins/11016309.md), 2025-04-02, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 2\_25\_Turbo Oil Drain](/bulletins/11014819.md), 2025-03-04, Other: ENGINE. CX Advocate for turbo oil drain cracking
- [CXA 2\_25\_NOx](/bulletins/11014818.md), 2025-03-04, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 1\_16\_Turbo Oil Drain](/bulletins/11013206.md), 2025-01-29, Other: ENGINE. CX Advocate for turbo oil drain cracking
- [CXA 1\_16\_NOx](/bulletins/11013204.md), 2025-01-29, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 1\_16\_DD13 Altitude](/bulletins/11013199.md), 2025-01-29, Other: ENGINE. CX Advocate for DD13 Gen 5 engines operating at high altitude experience EGR slow response fault.
- [CXA 1\_16\_CARB Truck Chec](/bulletins/11013196.md), 2025-01-29, Other: ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On\-Board Diagnostic \(OBD\) test submissions for the Clean Truck Check.

JSON: [/v1/bulletins/10174984](/v1/bulletins/10174984)

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