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1997 Chevy Silverado Z71 5.7....

The Sign Girl
04-17-2005, 10:58 AM
OBD2 codes P1860 & P1870 .......
Could all reply to what these codes are .
We own a 1997 Chevy Silverado w/ a 5.7 - 4 wd....and these codes appeared.
Please email ASAP @ nkwaun@webtv.net

12-26-2005, 08:35 PM
Hi the code P1860 is TCC PWM Solenoid Circuit Electrical. I looked up P1870 if the GM service manual and it indicates that P1870 is Transmission Component Slipping. You may need a valve body due to your TCC regulator valve and bushing wearing out. It is believed that this is mainly due to insufficient fluid changes. Hope this helps fix your problem.

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