# Service campaign C7122

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 campaign
- NHTSA id: 11020219
- Published by NHTSA: 2025\-07\-07
- Manufacturer's number: C7122
- Manufacturer's date: 2025\-06\-05
- Campaign id or software version: C7122
- NHTSA component: ENGINE

## NHTSA's summary

This Warranty Field Campaign is being issued to address a potential concern relating the FC3386 \(Specific Humidity Sensor \- Data Erratic, Intermittent, or Incorrect\) on certain MY2021, L9N CM2380 L142B engines. This Campaign authorizes certified service locations to recalibrate the engine's control module \(ECM\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11020219-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11020219-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS L9N

JSON: [/v1/bulletins/11020219](/v1/bulletins/11020219)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20campaign%20C7122&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11020219&vehicle=Service%20campaign%20C7122)