Replace Pressure Control Solenoid

**gates1847** · 09-19-2011

Have a transmission problem with my 2000 GT. Brought to Aamco to get diagnosis and pull any codes. They gave me P0748 and told me it could be one of a few electrical issues. P0748 refers to the Pressure Control Solenoid. I would like to know if anyone has replaced the PCS themselves and if so what work is involved and if you can replace it without taking the tranny off the car. Thanks.

**Swiggles** · 09-19-2011

i havent done one but it is inside the transmission in the valve body. it can be done in the car, you have to drop the sub frame to get to it and take the side cover off the transmission. you could buy an already rebuilt valve body and it would make the job alot easier and it replaces the solenoids and stuff.

**Trannyman95** · 09-21-2011

Before you dive into replacing the solenoid you need to ohm check it to determine if it is even bad. The best place to start is right at the pcm connector and use an ohm meter to check the resistance between the two wires for the pcs that go to the trans. There are ohm specs for the solenoids on our website for reference. You will need to get a pcm connector pinout picture and schematic to find the correct wires but this is a must-do step. You should also check each wire to ground and also measure each wire from the pcm connector to the transmission connector to make sure there is not a broken wire or one rubbed through and shorted to ground. A common wear area is just under the air box near the AC accumulator and lines where the harness lays on it. After the external wiring has been verified good/bad and if ok then you should do an ohm check right at the trans connector itself to check the solenoid resistance and if found bad right at the trans then it could be a bad internal transmission wire harness or the solenoid and that would require dropping the transmission down to remove the side cover for repair.

**BLWNPontiacs** · 09-28-2011

Originally Posted by Trannyman95

Before you dive into replacing the solenoid you need to ohm check it to determine if it is even bad. The best place to start is right at the pcm connector and use an ohm meter to check the resistance between the two wires for the pcs that go to the trans. There are ohm specs for the solenoids on our website for reference. You will need to get a pcm connector pinout picture and schematic to find the correct wires but this is a must-do step. You should also check each wire to ground and also measure each wire from the pcm connector to the transmission connector to make sure there is not a broken wire or one rubbed through and shorted to ground. A common wear area is just under the air box near the AC accumulator and lines where the harness lays on it. After the external wiring has been verified good/bad and if ok then you should do an ohm check right at the trans connector itself to check the solenoid resistance and if found bad right at the trans then it could be a bad internal transmission wire harness or the solenoid and that would require dropping the transmission down to remove the side cover for repair.

Absolutely correct, great post.