# Service bulletin TSB190022

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: 11019290
- Published by NHTSA: 2025\-06\-06
- Manufacturer's number: TSB190022
- Manufacturer's date: 2025\-05\-30
- NHTSA component: ENGINE

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution steps for the engine control module calibration for L9 engine powered refuse trucks operating at an altitude greater than 1220 m \(4000 ft\) which may be incorrect, resulting in fault codes 2639, 1921, or 1922 being set \(all fault codes are related to high soot load\). This is an update to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11019290-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11019290-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS L9

JSON: [/v1/bulletins/11019290](/v1/bulletins/11019290)

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