2000 GMC Sierra Engine code P1870

Tiny
MIA AL
  • MEMBER
  • 2000 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
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.
Tuesday, August 31st, 2010 AT 2:20 PM

1 Reply

Tiny
MISSY2977
  • MEMBER
  • 1 POST
I have a 2000 GMC Sierra 4 wheel drive and I had mine to a garage and that 1870 code is a valve in the transmission that needs to be replaced. My truck does the same exact thing. Once it's been driven on highway after a while it shifts hard the first 2 gears. If you shut the truck off for 5 to 10 minutes and start it back up, it should go away for a little while. Mine does!
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Sunday, September 19th, 2010 AT 1:58 PM

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