# Service bulletin TSB210020\-012920

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: 10187156
- Published by NHTSA: 2021\-02\-16
- Manufacturer's number: TSB210020\-012920
- Manufacturer's date: 2021\-01\-29
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of Allison Transmission Fault P2637 caused by engine control module calibration.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187156-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187156-9999.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/10187156](/v1/bulletins/10187156)

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