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2005 1500 saburban ,trany will not shift to over drive. had shift moduals & wire harness & oil changed. Had a code of P0785


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contributions: 2148
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Location: Oregon
you need to check for the power and ground to the 3-2 solenoid. Power for that solenoid is from fuse IGN 0. It is the pink wire going into the shift solenoids. The ground is the white wire from the shift solenoids to the power train control module.

If you have a scanner that can activate this solenoid, have someone cycle the solenoid and check the trans to see if it is cycling. (You may need to use a stethoscope to hear it clicking) You could also check you verify that you have power on the pink wire (battery voltage) and that the white wire is grounding the circuit.


   
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Thanks for that info. I think it mite be ground because it comes and goes. The big question is where is the ground wire grounded at.
The car works ok until you drive 50-100 miles.


   
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contributions: 2148
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Location: Oregon
If it is the ground side: the ground is supplied from the PCM. So you need to figure out if the computer is not supplying the ground of the ground is not getting to the solenoid.


   
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