2003 GMC ENVOY 4.2L AUTOMATIC

2005 NISSAN ARMADA
V8
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CLASSICTRANSMISSIONS
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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
Apr 20, 2011 at 11:19 PM
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SATURNTECH9
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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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Apr 21, 2011 at 4:54 AM
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SATURNTECH9
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I also posted a few bulletin's i found for code P1870 for you.
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Apr 21, 2011 at 5:07 AM
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