2003 GMC ENVOY 4.2L AUTOMATIC

  • Tiny
  • classictransmissions
  • 2005 Nissan Armada
  • V8

I have a 2003 GMC envoy 4.2 engine A/T and when my car gets warm enough my first gear to second it kinda feels like i've been hit from behind really hard shift. Ethen after I drive it for a while the engine light turns on. An p1870 code shows up. We've replaced the pwm solenoid, pressure control solenoid, 3-2 solenoid and the manifold switch. Still same issue persists. Please get back at me as soon as you can. I will donate for you guys. Thanks. VIN NUMBER IS: 1GKES16S136207615

Wednesday, April 20th, 2011 AT 11:19 PM

2 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,840 posts

I posted the code description for P1870 its for the transmission slipping. Did you find any metal debris etc in the transmission pan?Have you performed a transmission line pressure test yet?

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Thursday, April 21st, 2011 AT 4:54 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,840 posts

I also posted a few bulletin's I found for code P1870 for you.

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Thursday, April 21st, 2011 AT 5:07 AM

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