Drivetrain - Front Hubs Don't Engage In Extreme Cold

TSB 12-2-5

02/13/12

FRONT HUBS ENGAGEMENT IN EXTREME COLD
TEMPERATURES BELOW -18 DEGREES CELSIUS OR
0 DEGREES FAHRENHEIT - BUILT ON OR BEFORE
2/6/2012

FORD:
2011-2012 F-250, F-350, F-450, F-550

ISSUE
Some 2011-2012 F-Super Duty vehicles equipped with 4X4 and built on or before 2/6/2012 may exhibit a 4X4 not engaging, not staying engaged and/or unlocking in extreme cold temperatures below -18 degrees Celsius or 0 degrees Fahrenheit.

ACTION
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

This may be caused by a loss of vacuum between the front hub lock assembly and the front axle shaft seal assembly or the transfer case control module (TCCM) hardware.

1. Check the vehicle build date, refer to Workshop Manual (WSM), Section 100-01.

a. If the vehicle was built on or before 4/11/2011 replace the TCCM. Refer to WSM, Section 308-07A. Proceed to Step 2.

b. If the vehicle is built between 4/11/2011 and 2/6/2012, proceed to Step 2.

c. If the vehicle is built after 2/6/2012 this article does not apply. Refer to WSM, Section 308-07A for normal diagnostics.

2. Replace both front axle shaft seals. Refer to WSM, Section 205-03.





Parts Block

WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage Warranty/ESP coverage limits/policies/prior approvals are not altered by a TSB. Warranty/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.

OPERATION DESCRIPTION TIME

120205A 2011-2012 F-Super Duty 2.2 Hrs.
4X4 SRW: Replace Both
Front Axle Shaft Seals (Do
Not Use With Any Other
Labor Operations)

120205B 2011-2012 F-Super Duty 2.4 Hrs.
4X4 SRW: Replace The
TCCM, And Both Front
Axle Shaft Seals (Do Not
Use With Any Other Labor
Operations)

120205C 2011-2012 F-Super Duty 2.8 Hrs.
4X4 DRW: Replace Both
Front Axle Shaft Seals (Do
Not Use With Any Other
Labor Operations)

120205D 2011-2012 F-Super Duty 3.0 Hrs.
4X4 DRW: Replace The
TCCM, And Both Front
Axle Shaft Seals (Do Not
Use With Any Other Labor
Operations)

DEALER CODING
CONDITION
BASIC PART NO. CODE
3254 63





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