Transmission trouble - Ford Powerstroke Diesel Forum
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Old 12-16-2013, 06:15 AM
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Transmission trouble

I have been having issues with my automatic transmission. Whenever I drive it for say a good 15 minuets, the overdrive light starts to flash and the shifting gets bad. I will run it at about 50 mph when it feels like it wants to shift into overdrive but it doesn't, it just stays in that gear. But if I push the overdrive button, it seems to raise the rpm's slightly kinda like I'm taking it out of overdrive. Also when taking off from a stop, it feels like I should be going faster when comparing the rpm's to my speed. Kinda like it's slipping. Then when it shifts it shifts really late and hard. I have disconnected batteries for a little, connected them and the light shuts off and it runs better. I don't think it runs perfect but it's way better. It won't get bad again till I drive it for a good distance and really get it warmed up. I recently changed fluid and filter and have heard that I may have done bad by replacing fluid. Could it be shifting solenoid or low pressure when hot?


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Old 01-04-2014, 05:26 AM
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Any suggestions?


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Old 01-04-2014, 06:34 AM
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O/D-OFF light blinking means a transmission code is set. You'll need to obtain that code.
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Old 01-28-2014, 02:48 PM
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It has recently been slipping and shifting rough without the light blinking. I took it for a drive today and really drove it hard and it shifted like brand new. Felt a lot of power due to it not slipping. Put it in and out of od many times with normal changes. Could this problem be electrical because the truck is chipped and the torque converter stays locked until the brake is pressed so I wonder if it has to do with programming.


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Old 01-28-2014, 04:36 PM
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With any electronic (tranny included) issue, it's always good to start by reverting to stock - REMOVE the chip (don't just set it back to stock) and see how it behaves. If the chip has any impact, good or bad, on the reliability of the shifting, I would contact whoever programmed it.
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Old 01-28-2014, 06:32 PM
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So the chip would be in the PCM correct? I just recently bought the truck and am not fully sure as to how chips work and the programing behind it. But I will think about doing that. Thanks.


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Old 01-28-2014, 07:27 PM
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The chip is on the end of the PCM. Remove the fasteners for the parking brake handle assembly and pull the assembly inward. You'll see the tail end of the PCM, and the chip attached to it. That's what you want to remove. But if you bought the truck with the chip installed and haven't done so yet, you should contact the manufacturer or seller of the chip for instructions on installation, removal, setting, burning, etc.
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Old 01-29-2014, 03:08 AM
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Will it say on the chip who makes it?


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Old 01-31-2014, 06:19 AM
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I had the shifting issue until I changed my BPS. Barometric pressure sensor, it eliminated the hard shifts and was much more consistent. Just a suggestion
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Old 01-31-2014, 12:16 PM
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Thank you. I will keep that in mind.


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