tranny problems
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Joined: May 2010
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tranny problems
i was wondering if someone could tell me what they think, or the difference. I have a 99 ford f-250 superduty. The overdrive light begins to blink off an on and then it will shift really hard. im really not sure if it is the power control module or the transmission control module.
thankyou
thankyou
Senior User
Joined: Jan 2010
Posts: 430
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From: Florida
I have a 2004 F-250 4x4, AOD 5.4. My trans did that when it was cold. OD light would flash and shifting would be hard. I was told that it was cold and I did not let the truck warm up before I started driiving. Doesn't get cold down here in Florida too often and it only happened once. Hope that helps
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
There is a Powertrain Control Module (PCM.) There is no separate Transmission Control Module (TCM.)
It is rare, though possible, for the PCM to fail. I wouldn't replace the PCM without doing some diagnostics to see just what the problem really is.
It is rare, though possible, for the PCM to fail. I wouldn't replace the PCM without doing some diagnostics to see just what the problem really is.
Senior User
Joined: Jun 2007
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The OD light did flash and it did shift hard. Its located in the top of the transmission towards the rear third. I needed to drop the X-member and lower the transmission to replace it. Total job took about 45mins.
I would, however, get the scan tool on it to make sure it's that sensor. There is also a similar sensor towards the front of the transmission; Turbine Shaft Speed sensor. (as a note the sensor is identical for either location)
I would, however, get the scan tool on it to make sure it's that sensor. There is also a similar sensor towards the front of the transmission; Turbine Shaft Speed sensor. (as a note the sensor is identical for either location)
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
There are about 50 things that can cause problems like this. If you're going to change parts based on what fixed some other truck you're going to spend a lot more money to fix this than if you just had the codes read and knew where to look.
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