# Service bulletin TSB200059\-031120

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: 10173944
- Published by NHTSA: 2020\-04\-20
- Manufacturer's number: TSB200059\-031120
- Manufacturer's date: 2020\-03\-11
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of multiple J1939 aftertreatment component fault codes at first engine start of the day after engine cold soak. Aftertreatment power supply relay is found to have malfunctioned, causing high resistance in the relay, and in return, low power to the aftertreatment.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10173944-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10173944-9999.pdf)

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

## Components

Engine

## Vehicles listed

- CUMMINS B6.7

JSON: [/v1/bulletins/10173944](/v1/bulletins/10173944)

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