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Low epc pressure on 5r55e

Nctruckman

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I was looking into a hesitation to shift under WOT on my 2003 5r55e. I have forscan lite on my phone with a obdlink mx reader. I noticed the epc pressure ranged from 10-65 psi while driving, which is low as per the Ford shop manual. If the valve body gasket was blown, wouldn't it not shift or move at all? I know ford has an updated epc solenoid and bracket, could it fix this?
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Fix4Dirt

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I was looking into a hesitation to shift under WOT on my 2003 5r55e. I have forscan lite on my phone with a obdlink mx reader. I noticed the epc pressure ranged from 10-65 psi while driving, which is low as per the Ford shop manual. If the valve body gasket was blown, wouldn't it not shift or move at all? I know ford has an updated epc solenoid and bracket, could it fix this?View attachment 428891

View attachment 428892
yes low pressure can cause hesitation and delayed shift i;d start with the ford revisions or the sonnax/transgo kit (iirc all achieve the same result)
 






Nctruckman

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yes low pressure can cause hesitation and delayed shift i;d start with the ford revisions or the sonnax/transgo kit (iirc all achieve the same result)
Would I be better off getting an updated complete valve body or just modifying the one I have? It does have a sct tune, it shifted really nice and firm before, it does now intermittently.
 






Fix4Dirt

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Would I be better off getting an updated complete valve body or just modifying the one I have? It does have a sct tune, it shifted really nice and firm before, it does now intermittently.
it could go either way, as usually iirc updated VBs are somewhere around 300-500, and the transgo was 100 iirc if central valve bodies is still around, they had good stuff iirc
 






Nctruckman

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I found shift rite ones for a little under 3. Thank you for the input. I was gonna try the updated BW epc and updated bracket first to see if that's it, but now I'm hesitant.
 






Nctruckman

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I redid the test and at 1000 RPM it is 45 PSI and at stall speed it is around 113 PSI. So that meets the test specs in drive. I did notice however when I'm coasting or when I let off, it drops extremely low into the single digits. Is this normal or is this an issue?
 






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Fix4Dirt

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sounds good! keep us posted!
 






Nctruckman

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Swapped it out, made some dowel pins to help align it when reinstalling it. Put on a pan with drain too after getting an atf shower
IMG_20220528_160444526.jpg

IMG_20220528_162543526.jpg
 






Fix4Dirt

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did it resolve the issue?
 






Nctruckman

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It shifts nicer, but no, it still won't shift if you put it to the floor I'm gonna try taking the sct tune off and see if it still does it. I replaced the tps with a ford one, is there any other sensor that'll cause this?
 






Nctruckman

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So I reloaded the sct tune it had, then cleared the transmission adaptive tables and now it's doing great.
 






Nctruckman

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This popped up again, culprit is actually a plugged fuel filter causing the issue. This is from the cut open filter
Screenshot_20220701-124224.png
 






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Nctruckman

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Yep,I'm dropping the tank today. Engine wasn't running right and therefore couldn't shift right
 






Fix4Dirt

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Nctruckman

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This was left over from whenever the previous owner changed the fuel sending unit and didn't clean it out. Not much debris.
IMG_20220702_162114338.jpg
 






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