"The "valve body" is to be replaced along with the "pressure cylinoid"."
"Solenoid" It's an electromagnetic actuator.
I'm surprised this transmission has a valve body. Honestly, I would have expected the whole thing is controlled by solenoids...
Give us an update on the condition of #126. Did the dealer or Chevy give you any idea of what to look for in the future?
#2499 (only 1500 miles to date, 97 MPG)
"DTC po757 shift solenoid valve stuck on. Advised by TAC (apparent GM support personnel) to replace valve body and
trans control module assembly. Replaced valve body and TCM, program code 18166. Test drove, no codes returned."
I spoke to the mechanic and he stated that this issue was discussed in his Volt training session. The origin is reportedly due
to debri that enters the solenoid valve during assembly.