Question about GMC Yukon
This is a somewhat common problem in GM SUV's. The first and third error code are solenoid and the second one is a speed sensor. All of these share the same power source which comes from the Ignition Feed circuit of your ignition switch. I doubt that all three of these went out at the same time because it's highly unlikely. That being said, I think if you change the power source out this will fix your problem and will be the easiest/cheapest solution. You need to replace the ELECTRICAL portion of your ignition switch, not the lock cylinder portion. This should get you fixed up. Good luck and let me know if you have any further questions. Thanks for using FixYa!
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Two forward gears only
Gear missing or slipping
No upshift or slipping upshift
Non-First gear start
Refer to First Gear Range Only - No Upshift .
Refer to Third Gear Only .
Refer to Second/Third Gear Only or First/Fourth Gears Only .
Refer to Slips in First Gear .
Refer to Slipping or Harsh 1-2 Shift .
Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .
Refer to No 3-4 Shift, Slips or Rough 3-4 Shift .
Refer to No Part Throttle or Delayed Downshifts .
Refer to Second Gear Start .
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Trouble Code: P1870
Transaxle Component Slipping (4T60-E)
Trouble Code Conditions: DTC P0502, P0503, P0740, P0753, P0758, P0785 and P1860 not set, engine started, vehicle driven to a speed of 30-82 at an engine speed of 1000-3000 rpm, Fuel Shutoff inactive, TP angle from 8-35%, commanded gear not in 1st gear and the gear range is D4, TF
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