p1860 transmission solenoid?

1999 CHEVROLET SUBURBAN
100,000 MILES • V8 • 2WD • AUTOMATIC
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RWOODY86
  • MEMBER
  • 1 POST
changed the tcc pwm solenoid circuit. The p1860 message tells you to change. The change went good new part installed and still getting service enginee light. Had computer hooked up reset the code and 3 blocks later came back on. hooked computer back up and still getting the p1860 message. brand new part why doesn't it go off, service engine light, that is. Was told light will go off after 120 miles. Is this true? If not what next? I have to get it to pass smog and can't do it with service light on. Please help.
Apr 4, 2009 at 4:06 PM
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DANNY L
  • CAR REPAIR CONTRIBUTOR
  • 5,648 POSTS
Hello, I'm Danny.

Here is the information you requested. You might be having a wiring issue. Here is a tutorial showing how to test wiring:

https://www.2carpros.com/articles/how-to-check-wiring

I've attached a picture step diagnostic flow chart relating to the code P1860 on your Suburban. Hope this helps and thanks for using 2CarPros.
Aug 25, 2021 at 9:48 PM
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