# Service bulletin 37929.2.0

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: 11037964
- Published by NHTSA: 2026\-10\-05
- Manufacturer's number: 37929.2.0
- Manufacturer's date: 2026\-09\-14
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

This is a TJ \- text only no attachments \- If a customer experiences a DIM message stating "Propulsion System Service Required" and DTC IGM P06B400 is set, please follow the advice under "Service". Verify that the vehicle has software version 5.1.21 or newer. If necessary, update the vehicle's software according to TJ 31543. If the vehicle already has software version 5.1.21 or newer, or if the DTC comes back after the software update, replace the IGM.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037964-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037964-9999.pdf)

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

## Trouble codes named

P06B4

## Vehicles listed

- 2027 VOLVO XC60PHEV
- 2027 VOLVO XC90PHEV

JSON: [/v1/bulletins/11037964](/v1/bulletins/11037964)

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