• Tiny
  • ronnie99
  • GMC Jimmy

I have a 99 GMC Jimmy with 99,000 miles, V6, 4.3, 4X4.

This truck has given me no problems, but 2 days ago the engine light came on, so I hooked it up to a scanner. I'm getting code P1860, TCC PWM Solenoid CKT Eletrical

If this is really a fried solenoid wouldn't I have some shifting symptoms? The truck is not sluggish, shifts fine, runs good, no strange noises or smells.

Is it reasonable to think this might just be a bad wire, and if so is that something a reasonably competent person could replace on their own?

Wednesday, March 21st, 2007 AT 7:19 PM

1 Answer

  • Tiny
  • scottsqcc
  • Member

TCC just engages at highway speeds. The 2 cars I have had had a bucking at highway speeds. I believe that sensor would be easy to change just by dropping the pan because the valve body is right there. Little trickier on fwd cars. Hope that might help.

Was this
Monday, October 6th, 2008 AT 6:14 PM

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