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2005 ford 500 transmission buking hard and slipping when going

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2005 ford 500 transmission buking hard and slipping when going up hills whats the problem
Do you have any warning lights on ? Can I have a VIN # ?
Customer: replied 6 years ago.
no warning lights on give me a sec ill get the vin
Customer: replied 6 years ago.

Thanks for the VIN, it made it easier to find what I was looking for. How many miles are on it now ?

Customer: replied 6 years ago.
135,000 but its XXXXX XXXXXke that since 80,000 is starts off good in the morning but as the day go by it starts acting up its gettin worse now

THere are a couple of factory issued Technical service Bulletins tied exactly to this. It may require a new valve body and reprogramming. Thanks for the VIN, it made these easier to find.




Publication Date: November 13, 2008

FORD:2005-2007 Five Hundred
2006-2008 Fusion
LINCOLN:2006 Zephyr
2007-2008 MKZ
MERCURY:2005-2007 Montego
2006-2008 Milan

This article supersedes TSB 07-26-9 to update the vehicle applications, Parts List, Service Procedure and remove effected built date.


Some 2005-2007 Five Hundred, Montego, and 2006-2008 Fusion, Milan, 2006 Zephyr and 2007-2008 MKZ vehicles equipped with an Aisin automatic transmission may experience shift concerns when the vehicle mileage gets above 20,000 miles (32,200 km). Shifting concerns are generally noticed during passing maneuvers with transmission at temperatures greater than 212 °F (100 °C) operating temperatures. Symptoms may be present during downshift 5-3 at 35 MPH (56 km/h) and/or 4-3 at 20 MPH (32 km/h) with throttle opening at approximately 50% or greater and include:

  • Harsh shift and/or clunk noise
  • Delayed shift and/or perceived slip/engine flare



Follow the Service Procedure steps to correct the condition.


  1. If diagnostic trouble codes (DTCs) are present in transmission control module (TCM) / powertrain control module (PCM), do not continue with this procedure. Perform normal diagnostics. Refer to Workshop Manual (WSM), Section 307-01B
  2. If no DTCs are present and mileage is below 20,000 miles (32,200 km) reprogram TCM / PCM and retest.
  3. If no DTCs are present and vehicle is over 20,000 miles (32,200 km), fluid should be drained and checked for excessive contamination. If fluid is not burnt, the valve body should be replaced and TCM / PCM updated to the latest calibration level. Refer to WSM, Section 307-01B for main control valve body replacement.

8E5Z-7A100-BMain Control


Publication Date: November 22, 2005

FORD:2005-2006 Five Hundred
MERCURY:2005-2006 Montego


Some 2005-2006 Five Hundred/Montego vehicles built before 10/17/2005, equipped with the 6 speed automatic transmission, may exhibit harsh/erratic/slow downshifts or tip-in hesitation.


Reprogram the powertrain control module (PCM) and the transmission control module (TCM) to the latest calibration using WDS release B39.14 and higher or B40.2 and higher. This new calibration is not included in the B40 CD. Calibration files may also be obtained at www.motorcraft.com.

To reprogram the TCM, first identify the vehicle with the WDS, select module programming and press tic, select PCM and press tic, and follow all screen prompts.


Eligible Under Provisions Of New Vehicle Limited Warranty Coverage




EMRSR, Master Certified Service Manager
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Experience: 20 years with Ford, Master Certified
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