[oscar]

Hello guys, I’ve being follow this “code 1860” in my ’98 yukon (4l60e). I already tried everything that is posible to found in the web… and please, now I’m at the point of completely lost.
I check all the fuses relates to the tranny, same.
I changed the TCC PWM solenoid, same.
I check resistance in new solenoid, it’s ok.
I tried direct power 12v to pin “E”, same.
I check continuity in harness, it’s ok.
I even cut the brown wire on pin 7 Red connector at the PCM and install a temporary connection to a solenoid with a 12V supply (4 inches from the PCM)… and SAME… THE CODE CAME BACK!!! (after, I also tried with a light bulb with the same ohms as the pwm solenoid… and same)
Please advise… I’m in front of a bad PCM??

No other codes, transmission shifts fine…. only code 1860…and of course, no OD or lockup …and I do a lots of highway.

Thank you in advance

[Author]

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