Service bulletin TJ31949

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10088643
Published by NHTSA	2017-01-13
Manufacturer's number	TJ31949
Manufacturer's date	2016-10-18
NHTSA component	ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR; HYBRID PROPULSION SYSTEM: INVERTER

NHTSA's summary

THIS IS A TECHNICAL JOURNAL: IF THE INVERTER GENERATOR MODULE (IGM) IS EXPOSED TO HIGH TEMPERATURES AND VIBRATION, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET INDICATING AN INTERNAL ISOLATION FAULT THAT WILL RENDER THE IGM INOPERABLE.THE CORRECTIVE ACTION IS TO CHECK THE VEHICLES IGM SERIAL NUMBER AGAINST THE ATTACHED “IGM HOUSING SERIAL NUMBERS” LIST. IF THE LABEL NUMBER FOR THE VEHICLES IGM IS LISTED IN THE “IGM HOUSING SERIAL NUMBER” LIST, REPLACE THE IGM. IF THE LABEL NUMBER FROM THE VEHICLES IGM IS NOT ON THE LIST, NO FURTHER ACTION IS NECESSARY.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Electrical system, Hybrid and electric drive, Alternator

Vehicles listed
VOLVO XC90	2016
VOLVO XC90H	2016 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
TJ31798.2.0-2016	2019-11-18. Service bulletin. Inverter Generator Module "DTC IGM- P0DFC00, Generator Position Sensor Not learned" may be noticed at a VIDA readout. No reported customer symptoms. Ignore the DTC, work is ongoing to find the root cause.
TJ31798.1.0	2017-08-03. Service bulletin. This document is a Technical Journal: Inverter Generator Module "DTC IGM-P0DFC00, Generator Position Sensor Not learned" may be noticed at a VIDA readout. No reported customer symptoms. Ignore the DTC, work is ongoing to find the root cause.
PB32S39803201609	2016-12-29. Service bulletin. THIS IS A PARTS BULLETIN: IF THE INVERTER GENERATOR MODULE (IGM) IS EXPOSED TO HIGH TEMPERATURES AND VIBRATION, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET INDICATING AN INTERNAL ISOLATION FAULT THAT WILL RENDER THE IGM INOPERABLE.THE CORRECTIVE ACTION IS TO CHECK THE VEHICLES IGM SERIAL NUMBER AGAINST THE ATTACHED “IGM HOUSING SERIAL NUMBERS” LIST. IF THE LABEL NUMBER FOR THE VEHICLES IGM IS LISTED IN THE “IGM HOUSING SERIAL NUMBER” LIST, REPLACE THE IGM. IF THE LABEL NUMBER FROM THE VEHICLES IGM IS NOT ON THE LIST, NO FURTHER ACTION IS NECESSARY.
S3980320160926	2016-12-29. Service bulletin. THIS IS A QUALITY BULLETIN: IF THE INVERTER GENERATOR MODULE (IGM) IS EXPOSED TO HIGH TEMPERATURES AND VIBRATION, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET INDICATING AN INTERNAL ISOLATION FAULT THAT WILL RENDER THE IGM INOPERABLE.THE CORRECTIVE ACTION IS TO CHECK THE VEHICLES IGM SERIAL NUMBER AGAINST THE ATTACHED “IGM HOUSING SERIAL NUMBERS” LIST. IF THE LABEL NUMBER FOR THE VEHICLES IGM IS LISTED IN THE “IGM HOUSING SERIAL NUMBER” LIST, REPLACE THE IGM. IF THE LABEL NUMBER FROM THE VEHICLES IGM IS NOT ON THE LIST, NO FURTHER ACTION IS NECESSARY.
TJ31949102016092	2016-12-29. Service bulletin. THIS IS A TECHNICAL JOURNAL: IF THE INVERTER GENERATOR MODULE (IGM) IS EXPOSED TO HIGH TEMPERATURES AND VIBRATION, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET INDICATING AN INTERNAL ISOLATION FAULT THAT WILL RENDER THE IGM INOPERABLE.THE CORRECTIVE ACTION IS TO CHECK THE VEHICLES IGM SERIAL NUMBER AGAINST THE ATTACHED “IGM HOUSING SERIAL NUMBERS” LIST. IF THE LABEL NUMBER FOR THE VEHICLES IGM IS LISTED IN THE “IGM HOUSING SERIAL NUMBER” LIST, REPLACE THE IGM. IF THE LABEL NUMBER FROM THE VEHICLES IGM IS NOT ON THE LIST, NO FURTHER ACTION IS NECESSARY.