01-07-06, 03:22 PM
I had intermitting problems just recently, code po56 93 STS 4.6 northstar and it made my car shift down or lose a gear not sure because it happened so quickly. Finally it went completely, had one gear I put it in first nothing happened. I have one gear I think, usually rev up to 3000rpm to go around 50km. I have NO codes at all after clearing them, last one I saw was po56 buy thats gone too. My spedometer works fine, I'm considering doing the shift solenoids a and b but wondering if anything else can cause this so I don't waste money on something that may 'not' be the problem.
Solenoids should set a code but, anything is possible. Sounds like a good place to start.
01-08-06, 12:54 PM
Solenoids can definitely get "sticky" and not throw a code.
01-08-06, 10:54 PM
yes they very commonly get sticky
01-09-06, 06:55 PM
So as I have been reading, there is no TRANNY removal to replace the selonoids just the pan I take it?
The pan and the valve body I believe. Do a search for the proceedure. It is a little tricky as I understand you must split the valve body and there are 9 little check balls in there that must not be lost and must be put back in the right place.
01-10-06, 12:52 AM
Definitely search. There are a couple of threads that even included pics and diagrams. Not sure if they ever got put in tech tips!
01-17-06, 12:31 PM
Yes the solenoid was broken or something, had both replaced 70$ each.. Mechanic said he needed a tranny guy to remove some parts with a special tool (must of got ripped off) but it came out to 350$ no tax including oil change.