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Service bulletin 2008FA-4

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)
TypeService bulletin
NHTSA id10026786
Published by NHTSA2008-12-16
Manufacturer's number2008FA-4
Manufacturer's date2008-05-01
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

ALLISON TRANSMISSION SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. HIGH VOLTAGE INTERLOCK LOOP (HVIL) CIRCUIT CARDS FOR EP 40/50 SYSTEM, INSTALLED IN DUAL POWER INVERTER MODULES (DPIM) BUILT BETWEEN 6/14/05 & 6/20/06 WILL BE REPLACED. CSC LETTER WAS RECEIVED. *PE

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

Transmission and driveline, Automatic transmission

Vehicles listed
ALLISON TRANSMISSION
ALLISON DIV ALLISON DIV

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