# Service bulletin SU2201

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: 10217921
- Published by NHTSA: 2022\-08\-19
- Manufacturer's number: SU2201
- Manufacturer's date: 2022\-08\-18
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Cummins recently issued Temporary Repair Practice \(TRP2484\) for certain vehicles with DEF sensor failures in which DEF sensor replacement parts are not available. This provides a temporary ECM calibration that inhibits engine warning messages for communication errors with the DEF sensor allowing continued operation without engine derate. Regulators are allowing for this temporary calibration to be loaded in the engine ECM by a Cummins authorized repair location if the DEF sensor fails. This temporary calibration does not repair the failure therefore a final repair must be performed and the original calibration be re\-installed. Field Service has been requesting an ECM image be uploaded within the support ticket as part of the diagnostics and is carried over into Service Update 2201 \(SU2201\). In order to receive an authorization code and utilize Cummins TRP2484, you must follow the process, as outlined in SU2201. The specific component affected is Assembly Code: 35\-300 Emissions Components.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10217921-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10217921-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2016 to 2019 BLUE BIRD ALL AMERICAN
- 2020 to 2023 BLUE BIRD ALL AMERICAN SCHOOL BUS
- 2020 to 2023 BLUE BIRD ALL AMERICAN TRANSIT BUS
- 2016 to 2019 BLUE BIRD VISION
- 2020 to 2023 BLUE BIRD VISION SCHOOL BUS
- 2020 to 2023 BLUE BIRD VISION TRANSIT BUS

JSON: [/v1/bulletins/10217921](/v1/bulletins/10217921)

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