# Service bulletin 42\-059

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: 10203772
- Published by NHTSA: 2021\-12\-02
- Manufacturer's number: 42\-059
- Manufacturer's date: 2021\-11\-15
- NHTSA component: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN; ENGINE AND ENGINE COOLING

## NHTSA's summary

Non\-Safety Campaign â“ Vehicles with a Cummins X15 engine and Horton fan drive may set Diagnostic Trouble Code \(DTC\) 6637 and/or 3838 due to fan speed that results in the fan remaining activated until the power is cycled. A new controller will resolve the issue.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203772-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203772-9999.pdf)

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

## Components

Engine, Cooling fan, Cooling system

## Vehicles listed

- 2018 to 2020 KENWORTH T680
- 2016 KENWORTH T880
- 2018 to 2020 KENWORTH T880

JSON: [/v1/bulletins/10203772](/v1/bulletins/10203772)

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