# Service bulletin TSB210020

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: 10214694
- Published by NHTSA: 2022\-06\-27
- Manufacturer's number: TSB210020
- Manufacturer's date: 2022\-05\-19
- NHTSA component: ELECTRICAL SYSTEM; POWER TRAIN

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of Allison Transmission Fault P2637 caused by engine control module calibration. This is an update to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10214694-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10214694-9999.pdf)

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

## Components

Electrical system, Transmission and driveline

## Trouble codes named

P2637

## Vehicles listed

- CUMMINS X15

JSON: [/v1/bulletins/10214694](/v1/bulletins/10214694)

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