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DTC P0732 sets when 2nd clutch still slips after the PCM has commanded high main line pressure
DTC P0734 sets when 4th clutch still slips after the PCM has commanded high main line pressure.
DTC P0733 sets when 3rd clutch still slips after the PCM has commanded high main line pressure.
The powertrain control module (PCM) uses the crankshaft position (CKP) sensor, input speed sensor (ISS) and output speed sensor (OSS) to determine engine speed, input shaft speed and output shaft speed. These sensor readings are used to determine the current gear ratio and RPM slip across the torque converter. The PCM uses this information from the sensors to determine if the commanded gear matches the actual gear. During normal driving conditions, the PCM will adapt main line pressure via the pressure control (PC) solenoid to prevent slipping and harsh shifts. Shift solenoid 2 is used to apply or release second gear clutch. The PCM controls 2nd gear by controlling the ground for shift solenoid 2. The PCM will turn the solenoid Off (open the driver circuit) when second gear is commanded On to apply 2nd clutch. Shift solenoid 2 is supplied ignition voltage from the fuel pump relay whenever the PCM commands the fuel pump relay On.
Do you know how to test main line pressure ? Also , with the valve body off air check clutch packs . Do you know how to do that ? How many miles on the trany ?
this is a known issue with the gm 4L60E transmission. the valve body in transmission causes this. if it is wore, then less fluid is sent to shift selonoids. thus causing torque convertor not to lock up, and this causes slipping. if it slips 2 consecutive trips then the transmission detects this and should turn on check engine light. ( p1870 ). you can see if the tcc solinoid is bad. but if not its usually the valve body in tranny.
If the tranny is slipping try some Lucas Tranny additive use a suction gun to take a quart of tranny fluid out then pour in a quart of Lucas it has save many cars for me and my family.
I need a little mor info. But the reason for the being stuck in 2nd gear is because when something goes wrong with the tranny. it goes into "LIMP" mode wich keeps the trans. from shifting out of 2nd when you are going forward. It does sound like your trans. is gone out though.
Ok, you will need to first check the fluid level in this transmission. if the trans is sealed, you will need to take to the dealer for a fluid check. assuming that the fluid level is proper, this will usually be caused by a faulty transmission control module and faulty shift solenoids as well. these devices are located on and inside the trans and i recommendtestingeach device for flaws.
Most slips are the result of gear ware but, the solenoids and TCM will cuse this issue as well.
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