On a 2000 GMC Sierra after diving 30 miles, the transmission shift violently between 1st and 2nd gear (consistent at 10 mph) check engine light turns on. If I dive the truck locally (short trips) the Trans shift great no problems. The transmission has always been service per manufactures recommendation the fluid level fine no visible leaks. A buddy of mine has a code scanner and for six months it’s always the same code. P1870 manufactures control transmission.
Aug 31, 2010 at 2:20 PM