2004 Chevy Impala Transmission shifts hard

2004 CHEVROLET IMPALA
80,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
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 3:34 PM
Advertisement
Avatar
DENNYP
  • ✓ASE Certified Mechanic
  • 1,824 POSTS
  • ASE Certified Mechanic
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 4:23 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.