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Old 06-21-2010, 09:48 PM #1
riverwolf riverwolf is offline
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P0778 trans code - safe to drive until repair?

2003 V-8 4x4

To resolve a stripped transmission pan plug, I installed a new drain pan this past weekend. Initial startup with the new pan was a bit lower on ATF than I expected; apparently I managed to drain 6 quarts from the trans with the pan drop and sitting overnight. So, she immediately threw a CEL. Ran out of T-IV yesterday (5qt on hand), but resolved the fluid level issue this morning.

Despite getting the level fixed, the rig's in limp mode with 5th locked out and there's a really hard shift in the 2->1 downshift when stopping. The downshift is bad enough that I've taken to shifting to neutral before the 2->1 at 12mph.

Got the code read this afternoon, P0778 - Pressure Control Solenoid #2 (SL2). From the FSM, it appears to be mostly responsible for the 4->5 upshift, hence the fail-safe mode locking out 5th and the torque converter lockup. I don't see an obvious reason for the hard downshift. I disconnected the battery to clear the code (Autozone won't, by policy, in case you were wondering), but CEL returns immediately at startup.

So, that's a longwinded way of saying is it doing any harm to drive easy for a couple of days until I can get a new SL2 installed?

TIA.

-Brent
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Old 04-27-2020, 10:23 AM #2
cjm2022 cjm2022 is offline
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I realize this is a pretty old thread but i'm having the same issue. The main difference for me is that my hard shifting is between gears 2 and 3 it seems. I'm getting codes PO778 and PO748. One is for solenoid A and the other for solenoid B. This first happened about 6 months ago. My mechanic cleaned an external connection on the transmission and it went away for about 6 months. Now it's back he's cleaned the same connection but it did not fix the issue.

Riverwolf did you get this resolved, and if so how? Does anyone else have some advice?
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Old 09-26-2023, 12:10 PM #3
earthrealm earthrealm is offline
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Quote:
Originally Posted by cjm2022 View Post
I realize this is a pretty old thread but i'm having the same issue. The main difference for me is that my hard shifting is between gears 2 and 3 it seems. I'm getting codes PO778 and PO748. One is for solenoid A and the other for solenoid B. This first happened about 6 months ago. My mechanic cleaned an external connection on the transmission and it went away for about 6 months. Now it's back he's cleaned the same connection but it did not fix the issue.

Riverwolf did you get this resolved, and if so how? Does anyone else have some advice?
did you get this resolved, i have same p0748 code.. drained and refilled the tranny fluid. code remains. do you know the exact solenoid to replace? ppart number?
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