2002 Pontiac Grand Prix Transmission Shifting

2002 PONTIAC GRAND PRIX
20,010 MILES • 3.1L • 6 CYL • FWD • AUTOMATIC
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TUPOLVE
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  • 1 POST
I had just replaced the trans 3 yrs ago and its been doing fine untill about four days ago I noticed that sometimes the speedometer would jup wildly and the trans feels like ists changing gears. I have since replaced the output speed sensor and at times it runs good and at times the same problemI also notice that at times when this happens the rpms are up a little can you help
Oct 13, 2014 at 9:59 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,840 POSTS
  • ASE Certified Mechanic
It sounds like the PCM is starting to have problems, any trouble codes?

Oct 13, 2014 at 9:49 PM
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