pressure control solenoid issue..need help
pressure control solenoid issue..need help ok so when i start the car with the scanner hooked up all is good, the pcs has good amperage at about 1.05-1.07 shifting into gear is fine, nice and smooth...then as you touch the throttle it drops as u rev higher then sets a po748 and drops to 0.0 amperage and goes back to harsh shifts from park to gear...any information would be helpful. thankyou.
p.s. have checked wires they have good resistance throughout. new pcs solenoid tested before installation.
p.s. have checked wires they have good resistance throughout. new pcs solenoid tested before installation.
P0748 - Pressure Control Solenoid Circuit Electrical.
Its hard to say if you have checked everything but the code is electrical in nature and apparently either with the wiring /solenoid or PCM the circuit is either becoming open or shorted
Those type issues can be annoying to solve. If you have done any other work to the car I would also check over all ground connections.
Its hard to say if you have checked everything but the code is electrical in nature and apparently either with the wiring /solenoid or PCM the circuit is either becoming open or shorted
Those type issues can be annoying to solve. If you have done any other work to the car I would also check over all ground connections.
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This may be a long shot in the dark, but I read somewhere that someone was experiencing the same problem and it was caused by the camshaft not producing enough vacuum. I have a T-REX cam with a 110lsa and it probably has not very much in the way of vacuum. Any imput on this?????
No the code is and electrical code meaning the PCM is seeing either and open or a short in the PCS circuit. Its a hard electrical fault .Wiring/solenoid/grounds/power supply
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Teching In
Joined: Dec 2005
Posts: 17
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From: Mathis, Tx
same problem hey man im haven the same problem my shifts are hard and i got the same dtc cde about the pressure control solenoid so im wondering if you fixed your problem maybe i have the same 1 or do u have any ideas?
never figured mine out, did you have any luck with yours? I have since broke my transmission doing a launch at the track just to shake out any probs with car before i let my son drive it. I foud a big problem!LOL Think I may have broken the planetary gears as I now only have reverse gear. It was a sickening noise when it went!!! When I get the tranny out of the car I am going to check the backside of the engine for missing or lose ground wires as I can't see it now without pulling the intake off. Is there supposed to be a ground to the tranny itself?? This car was in pieces when I bought it so I am not 100% sure I have everything right!
Thats the rear planet and of note it is not and OEM 5 pinion rear planet. I would replace it either with and OEM 5pin planet or and OEM 4 pinion planet
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this would cause the car to only have reverse gear? And do I understand you correctly, replace it with an OEM part? Would you use the 5 pin or 4 pin if it was yours? FWIW, i should be putting around 450hp to the rear wheels.
Last edited by 98LSZ28; Oct 6, 2008 at 07:36 PM. Reason: added question
Well either would do well at that power I am sure but I would go with OEM 5 pinion if available and OEM 4 if not .
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Finally got the code to go away! Had to have my ECM reflashed back to the stock tune. Only code that came back was an EGR code because I have headers and don't have a EGR system anymore. Apparently someone had tuned the car before I got it and had butchered the DTC tables in the computer! All better now,well at least no codes! Now back to PBJ to put it on the treadmill(dyno) and get some numbers!
