# Service bulletin TSB180025

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: 11018175
- Published by NHTSA: 2025\-05\-08
- Manufacturer's number: TSB180025
- Manufacturer's date: 2025\-04\-26
- NHTSA component: ENGINE

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution steps for the coolant thermostat which may exhibit a fatigue malfunction caused by internal pressure, resulting in fault codes 146, 151, 1962, 2646 or 2963 being set, excessive coolant temperature, or an inability for the engine to reach operating temperature. 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-11018175-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018175-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS ISL9
- CUMMINS L9

JSON: [/v1/bulletins/11018175](/v1/bulletins/11018175)

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