2004 Chevy Impala Transmission shifts hard

2004 CHEVROLET IMPALA
80,000 MILES • 6 CYL • FWD • AUTOMATIC
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ROBNSONCS
  • MEMBER
  • 3 POSTS
Last month I had the transmission serviced at my local dealership (they flushed it). About a week later I noticed that the transmission started shifting hard. But this only occurs after I have been driving a while. It seems to shift fine after it's been sitting for a while or overnight. I've checked the fluid level and it's fine. What could be the problem?

Thanks,
Chris
Feb 12, 2008 at 7:34 AM
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DENNYP
  • ✓Experienced Mechanic
  • 1,824 POSTS
Have it scanned for trouble codes. You might find a p1811. It is possible that some debris was loosened up in the trans and plugged up in the PC solenoid. That will cause max line pressure and give the hard shifting.
Mar 17, 2021 at 9:23 AM
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