# Service bulletin TSB220173

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: 11030957
- Published by NHTSA: 2026\-04\-07
- Manufacturer's number: TSB220173
- Manufacturer's date: 2026\-03\-21
- NHTSA component: FUEL/PROPULSION SYSTEM

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution steps for the high voltage DC/DC converters of the battery electric system which may be labelled with the wrong part number, resulting in confusion when replacing components and the possibility that some high voltage DC/DC converters may be programmed incorrectly. This is an update to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030957-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030957-9999.pdf)

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

## Components

Fuel system

## Vehicles listed

- CUMMINS BES

JSON: [/v1/bulletins/11030957](/v1/bulletins/11030957)

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