I need some trans help with code P0748
06-11-2007, 10:55 AM
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I need some trans help with code P0748 Hey everyone. I'm throwng the following code:
[PCM] P0748 - Pressure Control Solenoid Circuit Electrical (Pending) (History) (Current) (Immature)
98 4l60E
now i have a vaccuum modulator kit in my trans with shiftkit. trans is not even a year old yet. car only been on road for a few days before the trans stopped going into gear. never seen track never been beaten on. has been sitting for 9 months. i cant move my car even when i let it idle. fluid level is perfect, trans temp is good.
anyone got ideas? when u put it into any gear you don't hear anything different, the rpms drop a little but thats it, no grinding sounds or anything sounding like mechanical stuff broken.
[PCM] P0748 - Pressure Control Solenoid Circuit Electrical (Pending) (History) (Current) (Immature)
98 4l60E
now i have a vaccuum modulator kit in my trans with shiftkit. trans is not even a year old yet. car only been on road for a few days before the trans stopped going into gear. never seen track never been beaten on. has been sitting for 9 months. i cant move my car even when i let it idle. fluid level is perfect, trans temp is good.
anyone got ideas? when u put it into any gear you don't hear anything different, the rpms drop a little but thats it, no grinding sounds or anything sounding like mechanical stuff broken.
06-11-2007, 11:15 AM
#2
The code may be normal depending on how the VAC mod was set up , But it will not cause a no movment , If your full of fluild and the car wont move you have a mechanical problem , If it wont move forward or backward its likley a pump failure , SORRY for the bad news but its got to come back out sounds like
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06-11-2007, 11:21 AM
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hmm it's weird because back in september the code wasn't there. i had that tranny installed about july last year and never seen this code before, now when the trans is back in the car with the new engine i see the code and can't drive the trans. the other nght we actually got it into reverse but then we put it into N then back into reverse and nothing.
06-11-2007, 12:26 PM
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do trans pumps go bad? cuz i thought if th pump fails you'd hear something different? cuz when i put it into gear you don't hear anything abnormal except the rpms drop a little but thats it. in a few mins i'm going to go check for the flow
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06-12-2007, 03:46 PM
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checked it today. nothings loose or abnormal ?! sometimes it will go in gear but wont stay in for long then if you move it outta gear it won't go back in.
06-12-2007, 04:39 PM
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yes, i don't understand because the trans has NEVER been beaten on since i bought it, tis only been sitting in the car the past 9 months while i built the new engine. sometimes it will go into a gear but then it wont stay in gear long and itll come right out. now i gave the shop a call that built the trans for my last year but they want nothing to do with it because my "3 month warranty is up". but i'm still baffled as to whats going on with my transmisson. i just want my fbody driving ! lol
06-12-2007, 08:00 PM
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seems fine. only thing different is theres new fluid in the trans cuz when we removed the first engine we dumped a lot of lfuid on the ground, then when we got it all together we made sure to put correct amnt in the TC then check the dipstick and filled it perfectly. it drove for two days no problems. this preassure solenoid that im getting the error for, would that still be in the trans even with a vac modulator? can that solenoid go bad? im going to check my tuning again but i don't think it has anthing to do with tune.
06-12-2007, 09:25 PM
#15
The solenoid would not make the car not move, it may however be there to fool the PCM bu I think either your low on fluild. the modulator has come undone, or theres some mechanical issue with your trans , Its not and electronics or tuning issue neither will make it not move
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