# Service bulletin C1937

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: 10129845
- Published by NHTSA: 2018\-03\-12
- Manufacturer's number: C1937
- Manufacturer's date: 2018\-02\-09
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

This Emissions Campaign is being issued to recalibrate the Engine Control Module \(ECM\) of certain ISX12 CM2350 engines. It provides authorization for certified repair locations to recalibrate the ECM with updated software. The calibration update allows certain NOx sensor diagnostics to run more frequently.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10129845-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10129845-0001.pdf)

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

## Components

Electrical system, Software

## Vehicles listed

- CUMMINS ISX12

JSON: [/v1/bulletins/10129845](/v1/bulletins/10129845)

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