# Service bulletin 05\-78\-20

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: 10182214
- Published by NHTSA: 2020\-11\-05
- Manufacturer's number: 05\-78\-20
- Manufacturer's date: 2020\-10\-13
- NHTSA component: ELECTRICAL SYSTEM; TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS

## NHTSA's summary

This Service Information Bulletin announces additional diagnostic procedures for TPMS related DTC C2921 on the applicable models listed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182214-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182214-9999.pdf)

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

## Components

Electrical system, Tires, Tire pressure monitoring

## Trouble codes named

C2921

## Vehicles listed

- 2019 to 2021 SUBARU ASCENT
- 2018 to 2020 SUBARU CROSSTREK
- 2019 to 2021 SUBARU FORESTER
- 2017 to 2021 SUBARU IMPREZA
- 2018 to 2020 SUBARU LEGACY

## Other bulletins for the same vehicles and component

- [07\-129\-18](/bulletins/10130271.md), 2018-03-13, Service bulletin: TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS. This bulletin announces availability of reprogramming files to optimize operation of the Tire Pressure Monitor System?s \(TPMS\) real\-time display function. Under certain high\-altitude conditions, the tire pressure values displayed in the combination meter may not be accurate.

JSON: [/v1/bulletins/10182214](/v1/bulletins/10182214)

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