Won't manually shift down - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 01-17-2020, 06:42 PM Thread Starter
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Won't manually shift down

Hello!
I'm having a strange issue I'm having a hard time figuring out. Truck is an 04 f250 with 06 motor and auto transmission. If I try to shift the transmission down into 3rd or 2nd etc it refuses to engine brake then throws flashing tow haul light few minutes after. Similar situation happens if I'm in tow haul mode and I attempt to compression brake but it refuses to gear down and throws the flashing tow haul light a few minutes later just the same. I've brought it to my local Ford dealership to get codes and an idea what's going on but they said they couldnt find anything wrong or any codes which I find hard to believe considering it still has this issue. I've heard from someone it could be the sensor on the rear diff that has failed or is failing? Aside from that it shifts fine in drive but it's tough not being able to compression brake as there are a lot of large hills where I live. Any help or suggestion is appreciated.

Edit: transmission fluid isn't dirty or burnt
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post #2 of 5 Old 01-17-2020, 07:07 PM
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flashing OD should have codes but I have seen where they won't store long if it not a conctant issue

how does your tow haul work on hills now ?

if you had a VSS *( speedo sender not working you should see a code,, those seem to store for a while even if intermittent

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post #3 of 5 Old 01-17-2020, 07:32 PM Thread Starter
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Quote:
Originally Posted by ZMANN View Post
flashing OD should have codes but I have seen where they won't store long if it not a conctant issue

how does your tow haul work on hills now ?

if you had a VSS *( speedo sender not working you should see a code,, those seem to store for a while even if intermittent
Thanks for the reply!

Yeah that's what I thought too. I think the dealership near me isn't the best might end up traveling far field to get proper service.

Tow/haul on hills or any grade acts as if it's not turned on even though the tow/haul light is illuminated. So basically no difference in shift strategy and no down shifting / compression braking.

That makes sense. So even if it was the vss wouldn't that leave my speedo useless? Not entirely sure the exact purpose of that sensor.

When manually shifting 1 through 3 it will engage those gears fine and upshift fine but for example if I'm heading downhill and shift into 3rd the engine brake doesn't engage at all it still behaves like it's in drive and doesn't allow any engine braking.
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post #4 of 5 Old 01-17-2020, 08:04 PM
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some say the front ABS sensors will give speed even if the rear fails

I have had the rear go wonky and speedo not read the shifting became sporadic and delayed

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post #5 of 5 Old 01-17-2020, 08:39 PM Thread Starter
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Okay I'll pull the rear sensor to clean and inspect it and see if it that helps.

On a side note would a clogged transmission inline filter cause similar symptoms?

Thanks for your help
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