# Service bulletin C1941F

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: 10171575
- Published by NHTSA: 2020\-02\-24
- Manufacturer's number: C1941F
- Manufacturer's date: 2020\-01\-31
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM

## NHTSA's summary

This field action authorizes certified repair locations to recalibrate the ECM and upfit the unit with an improved SCR Catalyst on certain ISL9 CM2350 L101 engines installed in Transit Bus Applications. New SCRs delete the NH3 Sensor and move from a three \(3\) wire harness to a NEW two \(2\) wire harness assembly. This is a revision to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171575-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171575-9999.pdf)

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

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- CUMMINS L9

JSON: [/v1/bulletins/10171575](/v1/bulletins/10171575)

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