2005 Ford Taurus PCM

SPRINKLER

MEMBER
2005 FORD TAURUS
6 CYL
FWD
AUTOMATIC
55,000 MILES

I took my car in to the shop because it would not shift correctly kept wanting to go to nuetrol I drove it about a block back home checked the fluid it was good clean and full did not smell burned. I called up a service station and they towed it to the shop. It has been there for a month they said the transmission was burned up and needed to be replaced. They rebuild the tranny and they still had the problem. They took it to a ford dealer and they said the PCM was bad. They have not replaced it yet, but I am wondering if the PCM was bad the whole time and the tranny was not bad? IF the PCM went bad would it burn the tranny up? Or did they replace a tranny that was not bad?

Wednesday, July 29th, 2009 AT 10:46 AM

1 Reply

JGAROFALO

MECHANIC
489 POSTS

Or. Did they CHARGE you for a transmission repair that was not performed?

THE primary cause of a condition like yours is a cracked forward clutch piston. If the transmission was repaired, this may have been overlooked, hence the probllem remains.

A "bad PCM" is an unlikely cause for several reasons.

The manual valve inside the transmission controls the initial routing of the hydraulic oil. In any driving range, oil is routed to the "default" circuit until the PCM takes over and controls different circuits to activate or deactivate friction elements that control gear ratios.

Example: When you select D or OD, the manual valve sends hydraulic pressure to the forward driving circuit. Vrom there, the PCM can only control the actual gear commanded by road speed, engine RPM, and loading. The choices are 1st, 2nd, 3rd, or 4th gears. Neutral is not an option.

Your problem is more of a mechanical/hydraulic nature.

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Friday, July 31st, 2009 AT 7:12 AM

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