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From: cbrennan on 21 Mar 2007 20:02
I have a 1999 GMC Jimmy with 99,000 miles that runs like a charm.

About 2 days ago the engine light started coming on, so I hooked it up
to the computer and the code I'm getting is P1860 TCC PWM Solenoid CKT
Electrical.

I've had no problems with shifting, hesitation, idling, jumping
gears...nothing. If this were really a fried solenoid, wouldn't I
have a few other symptoms?

I'm wondering if this is maybe just a bad wire, and if so, is is
reasonable for me to try replacing the wiring before taking the truck
to a garage?

Any ideas?

Ronnie

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