# Service bulletin 37871.1.0

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: 11036242
- Published by NHTSA: 2026\-08\-18
- Manufacturer's number: 37871.1.0
- Manufacturer's date: 2026\-07\-11
- NHTSA component: POWER TRAIN

## NHTSA's summary

This is a TJ \- Text only no attachments \- During the first year in production of the new engines, with the updated transmission calibration, we need to follow up on transmission shift quality. For this reason, it is not allowed to perform any repairs on the transmission before RTS \(Volvo Cars Retailer Technical Support\) has been contacted. No transmissions should be repaired or replaced without approval or a request from RTS.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036242-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036242-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2027 VOLVO XC60MHEV
- 2027 VOLVO XC90MHEV

## Other bulletins for the same vehicles and component

- [36774.4.0](/bulletins/11037965.md), 2026-10-05, Service bulletin: POWER TRAIN. This is a Technical Journal: Text plus 1 PDF \-\- DTC TCM P277C07 set. If the TCM DTC listed below is set, A new transmission hardware solution has been introduced starting from transmission serial number 25M8L30144, which serves as a defined break point for updated production. \*If the DTC is confirmed and the transmission serial number is after the break point: Do NOT replace the transmission follow the advise under "Service".

JSON: [/v1/bulletins/11036242](/v1/bulletins/11036242)

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