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Ronnie
Ronnie, ASE Certified Technician
Category: Saturn
Satisfied Customers: 35832
Experience:  34 year as an ASE Tech
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I got a p1599, intermittently will not go to low gear,starts

Customer Question

i got a p1599 , intermittently will not go to low gear,starts of in 2.
Submitted: 2 years ago.
Category: Saturn
Expert:  Ronnie replied 2 years ago.
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The code P1599 can be set due to any of the following,
Power Supply
Powertrain Control Module (PCM) Ground
Powertrain Control Module (PCM) Power
Sensor
Solenoid Control
Trouble Code
In order to determine the cause you are going to need to do some testing, see the steps in the link below, copy and paste the link to your browser to open and view it.
https://dl.dropboxusercontent.com/u/104923897/P1559%20Aug%2015.pdf
The code P0731 can be set by the following,
1st Gear Sprag Clutch Assembly
Transaxle Fluid Pump
See the test steps in the link below.
https://dl.dropboxusercontent.com/u/104923897/P0731%20Aug%2015.pdf
GM has also released a TSB for the code P0731 , I have enclosed it in the link below as it may be the problem you are dealing with.
https://dl.dropboxusercontent.com/u/104923897/Service%20bull%20Aug%2015.pdf