When shifting the engine/transmission jumps but not all the time

2008 PONTIAC G6
140,000 MILES • 4 CYL • AUTOMATIC
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JOSEAVELAZQUEZ
  • MEMBER
  • 1 POST
Good morning.

My problems comes when I change from P to R or D the transmission or the engine jumps. The strange thing is that their is no check engine light. I already change all the transmission and engine mounts and still doing it. An important point is that it does not always do it. I wanted to know if it can be related to the input/output speed sensors and if yes where those sensors located at?
Apr 3, 2018 at 7:28 AM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
Yes the sensors can be causing this. It would be better if you made a video and upload it so we can see what is going on when the engine jumps. I do not think a shaft speed sensor will make a difference when the car is not moving. We should run the codes even though the light is not on just to see if anything comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let us know what happens.

Cheers, Ken
Apr 4, 2018 at 11:18 AM
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