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Erratic shifting after it warms up. No leaking. transmission…

Customer Question
Erratic shifting after it...

Erratic shifting after it warms up

Mechanic's Assistant: How old is the transmission? Have you noticed any leaking?

No leaking. transmission has 122000 miles

Mechanic's Assistant: What is the model/year of your Buick?

2004 Buick lesabre 3.8 motor 6 cyclinder

Mechanic's Assistant: Are you fixing your LeSabre yourself? What have you tried so far?

Yes. We have changed the pressure control sensor and motor mounts. worse

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Shifts up to fast hard shifting half the time. other times it shifts smooth. Transmission or computer????

Submitted: 7 months ago.Category: Transmissions
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Answered in 1 hour by:
12/22/2017
Transmission Mechanic: Dan, Technician replied 7 months ago
Dan
Dan, Technician
Category: Transmissions
Satisfied Customers: 26,040
Experience: 2 Year Automotive Technician Diploma, Independent Shop Experience, and Multiple Database Access.
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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Transmission Mechanic: Dan, Technician replied 7 months ago

Is the check engine light on?

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Customer reply replied 7 months ago
it says gas cap is loose.
Transmission Mechanic: Dan, Technician replied 7 months ago

Ok, that wouldn't cause the hard shifting. The most likely cause is debris in the valve body. You can try to do a transmission flush to see if that helps if not the next step is removing valve body, taking it apart, and cleaning it out. This would be about a 9 hour job to be done at a shop because axle needs to be removed, transmission needs to be lowered a few inches, then remove side cover. Here is a TSB related to problem, usually problem doesn't get worse so dealing with it might be best option. Let me know if you have questions, thanks.

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https://www.dropbox.com/s/wlcq7xp439k6qpi/vb.pdf?dl=0

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Customer reply replied 7 months ago
I replaced the trans pressure control solenoid. When I did I dropped the first retaining clip. Never found. Bought another one and put back together. Could this loose clip in the trans be the problem?
Transmission Mechanic: Dan, Technician replied 7 months ago

It is possible but unlikely, especially since problem was happening before that. If there was a problem with solenoid position in valve body it would most likely shift hard at all times. Let me know if you have questions, thanks.

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Transmission Mechanic: Dan, Technician replied 7 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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