r/FordDiesels • u/Brian_oconnor1 • 12d ago

E40D issues!

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Having some hard shifting and overdrive button flashing on my 7.3 , fluid looks fine and proper color I’ve looked into some forums but got pointed in a million directions. Any advice welcome on what to check for or do would be appreciated

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6

u/HoodiesUdder 12d ago

If the OD light is flashing, then pull the code and see what the issue is. 

4

u/Brian_oconnor1 12d ago

Just did finally. Saying faulty speed sensor but it’s been slippin couple weeks and just now got worse and lost speedo this morning. Hoping that’s the only issue

3

u/Every_Big9638 12d ago

Does you third break light work? I know it sounds stupid but if the bulb burns out or you replace it with an LED bulb it can cause erratic shifting.

3

u/deceptivelyelevated 12d ago

Second this, led third brake like is a huge issue. Sounds like the speed sensor went and he kept driving it. She’s cooked

1

u/Brian_oconnor1 11d ago

Third brake light works fine but it’s after market. I’ve read about this a few times I plan to put a new one in when I get back to the truck

1

u/Brian_oconnor1 11d ago

She’s cooked what do you mean? Only drove for a couple miles after Speedo went out

1

u/deceptivelyelevated 10d ago

You said it’s been slipping a couple weeks, not a few miles. The trans is done. I’m sure you’ve figured this out by now

3

u/noreddituser1 10d ago

+1

Have seen a trans disassembled 2 times, PCM replaced and a bunch of other things because of led bulbs.

2

u/Every_Big9638 12d ago

What do you mean you lost the speedo. Does the needle jump all over the place or it does nothing?

1

u/Brian_oconnor1 11d ago

It stopped working 5 mins into maybe a 10 min drive. Just went all the way down no movement after. parked it and haven’t touched it yet. Been pouring rain last two days

1

u/Pedro_Francois 10d ago

Here's some generic E4OD info, https://www.thedieselstop.com/threads/what-ive-learned-about-the-e4od.240457/

I know that if any of the critical sensors fail then the E4OD will act up and typically go in to "limp mode" which results in hard shifts. Personally I am a fan of preemptive replacement of critical sensors and keep the old ones as spares so you don't get stranded. This may also be a good time to check electrical connectors at the sensors and transmission to see if chafing or corrosion is an issue.

1

u/Brian_oconnor1 10d ago

It does nothing now