# Service bulletin SM1906

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: 10201697
- Published by NHTSA: 2021\-10\-01
- Manufacturer's number: SM1906
- Manufacturer's date: 2019\-12\-11
- NHTSA component: POWER TRAIN

## NHTSA's summary

The intent of Service Memorandum SM1906 is to make Blue Bird dealers aware that Cummins has released a calibration update improvement to reduce occurrence of “Engine fault codes 3555 and 3556” on Cummins diesel engines with the following base ECM calibrations, "HC80145 thru HC80250 and HB80104 thru HC80195"

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10201697-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10201697-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2017 to 2019 BLUE BIRD ALL AMERICAN
- 2020 BLUE BIRD ALL AMERICAN SCHOOL BUS
- 2020 BLUE BIRD ALL AMERICAN TRANSIT BUS
- 2017 to 2019 BLUE BIRD VISION
- 2020 BLUE BIRD VISION SCHOOL BUS
- 2020 BLUE BIRD VISION TRANSIT BUS

JSON: [/v1/bulletins/10201697](/v1/bulletins/10201697)

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