Rebuilt Trany 4L60E Scanner Code P1860 - will shift to overdrive sometimes need help with code to fix overdrive problem Joe rebuilt the transmission at work on 97 Sierra 4WDR 4L60E transmission. He drove it and it will shift to overdrive sometimes then sometimes it will not. Ran scanner test and the code comes back to P1860. Checked for fuse or bad ground and found nothing. Can you please help with this so he can fix the work truck and come home for X-Mas Vacation. Thanks and Merry Christmas to you and your families.
Wednesday, December 21st, 2011 AT 8:57 PM