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Service bulletin ASI-45121

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 id10058459
Published by NHTSA2015-09-23
Manufacturer's numberASI-45121
Manufacturer's date2015-05-01
NHTSA componentPOWER TRAIN:AXLE HUBS

NHTSA's summary

FORD: ON SOME TRUCKS WITH ELECTRONIC 4WD SHIFT, AXLE SEAL (3254) NEEDS REPLACEMENT DUE TO VACUUM LEAKS AND IF REQUIRES REPAIR OR SERVICE, AXLE SEAL KIT IS AVAILABLE. MODEL 2011-15 F SUPER DUTY. *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, Axle

Vehicles listed
FORD F-250 SD2011, 2012, 2013, 2014, 2015 (the catalog's model; the bulletin names a series or trim of it)
FORD F-350 SD2011, 2012, 2013, 2014, 2015 (the catalog's model; the bulletin names a series or trim of it)
FORD F-450 SD2011, 2012, 2013, 2014, 2015 (the catalog's model; the bulletin names a series or trim of it)
FORD F-550 SD2011, 2012, 2013, 2014, 2015 (the catalog's model; the bulletin names a series or trim of it)
FORD F-650 SD2011, 2012, 2013, 2014, 2015 (the catalog's model; the bulletin names a series or trim of it)
FORD F-750 SD2011, 2012, 2013, 2014, 2015 (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.

Recalls for the same vehicles and component
12V0090002012-01-12. POWER TRAIN:AXLE ASSEMBLY

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
ASI-447152015-07-08. Service bulletin. FORD: BETWEEN FRONT HUB LOCK ASSEMBLY AND FRONT AXLE SHAFT SEAL ASSEMBLY, A LOST OF VACUUM HAS OCCUR, DUE TO CONCERNS WITH FRONT AXLE HUB SEAL(S) RESULTING IN 4X4 NOT ENGAGING OR UNLOCKING OR FAILING TO STAY ENGAGED. MODEL 2013-15 F-SUPER DUTY 4X4. *PE
12-2-52012-05-14. Service bulletin. FORD: SOME VEHICLES EXHIBIT A 4X4 NOT ENGAGING, NOT STAYING ENGAGED AND/OR UNLOCKING IN EXTREME COLD TEMPERATURES BELOW -18 DEGREES CELSIUS OR 0 DEGREES FAHRENHEIT. INCLUDE FORD MODEL F250, F350,F450, AND F550 MODEL YEARS 2011-2012. *JS