Transmission Pressure Control Solenoid (PCS)
Explains the Transmission Pressure solenoid testing. (note: the following is NOT a sales pitch. We allow all schools and training institutions to use our software free of charge, so long as it is not sold to others. You’re encouraged to download our free automotive simulation software for more information.
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@ADPTraining CONTINUED:
Second, if tranny shifts fine and smooth it is surely an electronic fault. If tranny is not shifting properly and ISS OSS checks out fine, then you have a mechanical issue.
Post more with further details so that we can uncover the issue. Good luck.
@srhabb OK, it would help if I know the YMM, but here we go. This DTC (code) is generated when the ECM compares the input and output speed sensors (ISS/OSS) and determines that the tranny is in the wrong gear. In other words, if 3rd is commanded the ISS/OSS comparison may indicate that trans is in 1st gear, then ECM issues DTC.
First off, monitor the ISS and OSS for erratic output. You may do this with DMM or Scope.
If ok then feel for all shifts being done.
I need some advice on what to do about P0776.
Pressure Control SOLENOID B CKT Performance or Stuck off.
What should I do?
@surfmusicjamweedgirl OK, use this rationale: If when dismantling the Trans oil pan you have access to the PCS, then don’t change it (assuming it’s ok). PCS units are the strongest of the all transmission solenoids. They have to be. But, if getting to it requires major disassembly, then replace it. 4L80Es are strong units, but you do have almost 300K, so tread carefully. Good luck…Mandy.
Hey my transmission guy said we should change out the PCS as it wears and my truck is at 260,000km and it’s unknown if it’s stock. Do these slowy wear out?
I’m due for a fluid/filter change/flush and not sure if he’s bs’ing me.
I have a ’96 Chev Silverado 3/4 Diesel pick up, probably with the 4L80E
@PatinOmaha These PC sol. are tough units. If possible disable by removing fuse (if separate). The noise does seem a bit problematic. A faulty PC sol. would not cause a noise.
Other possible fault areas are the TPS and VSS (vehicle speed sensor). The TPS is a main shift input to the TCM. VSS is the main speed input and also a main shift point determinator. Good luck to you. Mandy.
@PatinOmaha Disconnect the PC sol. and see if there’s a difference in shift quality.
I have a 2000 Montana van that is occasionally up-shifting hard and has a whining noise when that’s occurring. Some people say that it’s a trans pressure control solenoid. Is that a common problem on that GM vehicle?
Cont…
You may want to apply 12 volts directly, but IN A PULSATING WAY and see if PCS clicks. Don’t leave 12v on or you’ll damage the unit. See how that goes. Good luck…
OK, the fact that the voltage starts at 3 and drops to 1 says that as the PCS gets hotter, resistance drops, hence 1 volts seen at the end. One volt is kind of high, meaning that there’s excessive resistance at the PCS windings. Having said that, compare by measuring resistance, with solenoid hot. These units normally carry very low resistance. Or almost like a straight through wire. Your PCS doesn’t seem shorted, which is more common.
Hi ADPTraining, Thank you very much for the instruction. I’ve done the test to my PCS on a 4T65E trans on a 9 V square battery. and the reading is around 3 Volts and slowly drops to 1 Volts or so, then I disconnected just so I don’t damage the Solenoid. Why my solenoid does not read between 100 mV to 300 mV as you mentioned ? Is it a dead solenoid, or something else.
Thank you very much
Tim