Code P0785
2,335

Asked by Jeff Dec 06, 2018 at 03:17 PM about the 1999 GMC Suburban K1500 4WD

Question type: Maintenance & Repair

I install a used transmission in this truck about 2 weeks ago. Customer returned to day saying it was sluggish. Fluid look good and filled to proper level. Truck is taking off in 3rd gear and doesn't shift. I cleared the P0785 code and truck shifted into 1st gear and took off fine. Once it upshifted the SES light came back on and it wouldn't shift past 3 gear. P0785 returned. I want to check resistance value on 3-2 solenoid but I don't have a wiring diagram. Can some tell me what pins to check for the 3-2 solenoid?

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