transmisson problem need help on this - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-23-2007, 10:33 PM   #1
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Default transmisson problem need help on this

i got rid of my 93 bonneville ssei,,,,, and got a 1999 pontiac grand prix gt with the grand prix i am having tranny problems it is the 3.8L non supercharged it has 245,000miles all orignal from 1 owner ,
THE PROBLEM-
it shifts from 1st-2nd fine at like 25mph ,and from 2nd to third it wont shift ,it goes stright in to 4th ,and then o/d fine , i had it tested and it says 3rd gear isnt engageing
so i am trying to figure out what it could be it seems like it trys u can feel a buck
it shifts from 2nd in to forth right at 45mph and wont shift untill you hit that speed.
THINGS I DID-
i had the tranny filter and fluid changed no shavings and it wasnt that bad
and i got a code po717 and po716 speed sensor but this just started .
SO ANY HELP WOULD BE GREATLY APPRECIATED CAUSE I REALLY WANNA FIGURE OUT IF MAYBE ITS JUST A SENSOR.thanks for replys!

o and were is the speed senor turbine thing located in the tranny?
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Old 09-24-2007, 01:05 AM   #2
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i'm not the best here but like P0716-P0717 tell, it seem like to be the sensor low or no signal on it
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Old 09-24-2007, 09:06 AM   #3
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The VSS is in the differential housing on the passenger side of the trans.
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Old 09-25-2007, 10:34 AM   #4
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ok thanks , but do you think that is the reason why 3rd isnt there? cause no check engine light was on before and 3rd wasnt there.
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Old 09-25-2007, 01:26 PM   #5
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VSS is part of the equation for getting the car in the correct gear.

DTC P0716
Input Speed Sensor Circuit Intermittent

DTC P0717
Input Speed Sensor Circuit Low Input
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