# Service bulletin T2490

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: 10203200
- Published by NHTSA: 2021\-11\-08
- Manufacturer's number: T2490
- Manufacturer's date: 2021\-09\-23
- NHTSA component: ENGINE AND ENGINE COOLING; FUEL SYSTEM, DIESEL

## NHTSA's summary

This Temporary Repair Practice is being issued to address certain Daimler \(Freightliner, Thomas Built Bus, Western Star\) vehicles with DEF header sensor failures in which DEF header replacement parts are not available. Due to DEF header part shortages, an ECM calibration is being released that reduces inducement levels to allow for continued operation of the vehicle until DEF header parts become available for a final repair.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203200-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203200-9999.pdf)

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

## Components

Engine, Fuel system

## Vehicles listed

- CUMMINS ISX
- CUMMINS ISX15

JSON: [/v1/bulletins/10203200](/v1/bulletins/10203200)

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